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[TCWG CI] 464.h264ref slowed down by 7% after llvm: [PassManager] `buildModuleOptimizationPipeline()`: schedule `LoopDeletion` pass run before vectorization passes

by ci_notify＠linaro.org

After llvm commit 9c2469c1ddb34517de8dafd83d1940deada3fc22 Author: Roman Lebedev <lebedev.ri(a)gmail.com> [PassManager] `buildModuleOptimizationPipeline()`: schedule `LoopDeletion` pass run before vectorization passes the following benchmarks slowed down by more than 2%: - 464.h264ref slowed down by 7% from 10836 to 11596 perf samples - 464.h264ref:[.] FastFullPelBlockMotionSearch slowed down by 46% from 1525 to 2231 perf samples Below reproducer instructions can be used to re-build both "first_bad" and "last_good" cross-toolchains used in this bisection. Naturally, the scripts will fail when triggerring benchmarking jobs if you don't have access to Linaro TCWG CI. For your convenience, we have uploaded tarballs with pre-processed source and assembly files at: - First_bad save-temps: https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_tx1-llvm-master-… - Last_good save-temps: https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_tx1-llvm-master-… - Baseline save-temps: https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_tx1-llvm-master-… Configuration: - Benchmark: SPEC CPU2006 - Toolchain: Clang + Glibc + LLVM Linker - Version: all components were built from their tip of trunk - Target: aarch64-linux-gnu - Compiler flags: -O3 - Hardware: NVidia TX1 4x Cortex-A57 This benchmarking CI is work-in-progress, and we welcome feedback and suggestions at linaro-toolchain(a)lists.linaro.org . In our improvement plans is to add support for SPEC CPU2017 benchmarks and provide "perf report/annotate" data behind these reports. THIS IS THE END OF INTERESTING STUFF. BELOW ARE LINKS TO BUILDS, REPRODUCTION INSTRUCTIONS, AND THE RAW COMMIT. This commit has regressed these CI configurations: - tcwg_bmk_llvm_tx1/llvm-master-aarch64-spec2k6-O3 First_bad build: https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_tx1-llvm-master-… Last_good build: https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_tx1-llvm-master-… Baseline build: https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_tx1-llvm-master-… Even more details: https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_tx1-llvm-master-… Reproduce builds: <cut> mkdir investigate-llvm-9c2469c1ddb34517de8dafd83d1940deada3fc22 cd investigate-llvm-9c2469c1ddb34517de8dafd83d1940deada3fc22 # Fetch scripts git clone https://git.linaro.org/toolchain/jenkins-scripts # Fetch manifests and test.sh script mkdir -p artifacts/manifests curl -o artifacts/manifests/build-baseline.sh https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_tx1-llvm-master-… --fail curl -o artifacts/manifests/build-parameters.sh https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_tx1-llvm-master-… --fail curl -o artifacts/test.sh https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_tx1-llvm-master-… --fail chmod +x artifacts/test.sh # Reproduce the baseline build (build all pre-requisites) ./jenkins-scripts/tcwg_bmk-build.sh @@ artifacts/manifests/build-baseline.sh # Save baseline build state (which is then restored in artifacts/test.sh) mkdir -p ./bisect rsync -a --del --delete-excluded --exclude /bisect/ --exclude /artifacts/ --exclude /llvm/ ./ ./bisect/baseline/ cd llvm # Reproduce first_bad build git checkout --detach 9c2469c1ddb34517de8dafd83d1940deada3fc22 ../artifacts/test.sh # Reproduce last_good build git checkout --detach 4bef0304e153c757c9f42c2001d4c56e8f99929e ../artifacts/test.sh cd .. </cut> Full commit (up to 1000 lines): <cut> commit 9c2469c1ddb34517de8dafd83d1940deada3fc22 Author: Roman Lebedev <lebedev.ri(a)gmail.com> Date: Wed Nov 3 19:23:25 2021 +0300 [PassManager] `buildModuleOptimizationPipeline()`: schedule `LoopDeletion` pass run before vectorization passes Test thanks to Michael Kuklinski from `#llvm`: https://godbolt.org/z/bdrah5Goo originally inspired by Daniel Lemire's https://lemire.me/blog/2021/10/26/in-c-is-empty-faster-than-comparing-the-s… We manage to deduce that the answer does not require looping, but we do that after the last `LoopDeletion` pass run, so we end up being stuck with a dead loop. Now, as with all things SCEV, this has a very expected ~`+0.12%` compile time performance regression: https://llvm-compile-time-tracker.com/compare.php?from=0ae7bf124a9bca76dd9a… (for comparison, doing that in function simplification pipeline would have been ~`+0.5` compile time performance regression, D112840) Looking at the transformation stats over vanilla test-suite, i think it's rather expected: ``` | statistic name | baseline | proposed | Δ | % | |%| | |--------------------------------------------------|----------:|----------:|------:|-------:|-------:| | scalar-evolution.NumBruteForceTripCountsComputed | 789 | 888 | 99 | 12.55% | 12.55% | | scalar-evolution.NumTripCountsNotComputed | 105592 | 117900 | 12308 | 11.66% | 11.66% | | loop-delete.NumBackedgesBroken | 542 | 559 | 17 | 3.14% | 3.14% | | regalloc.numExtends | 81 | 79 | -2 | -2.47% | 2.47% | | indvars.NumFoldedUser | 408 | 400 | -8 | -1.96% | 1.96% | | indvars.NumElimCmp | 3831 | 3758 | -73 | -1.91% | 1.91% | | scalar-evolution.NumTripCountsComputed | 299759 | 304278 | 4519 | 1.51% | 1.51% | | loop-delete.NumDeleted | 8055 | 8128 | 73 | 0.91% | 0.91% | | machine-cse.NumCommutes | 111 | 110 | -1 | -0.90% | 0.90% | | globaldce.NumFunctions | 1187 | 1192 | 5 | 0.42% | 0.42% | | codegenprepare.NumSelectsExpanded | 277 | 278 | 1 | 0.36% | 0.36% | | loop-unroll.NumRuntimeUnrolled | 13841 | 13791 | -50 | -0.36% | 0.36% | | machinelicm.NumPostRAHoisted | 1168 | 1172 | 4 | 0.34% | 0.34% | | phi-node-elimination.NumCriticalEdgesSplit | 83054 | 82879 | -175 | -0.21% | 0.21% | | machine-cse.NumPREs | 3085 | 3079 | -6 | -0.19% | 0.19% | | branch-folder.NumBranchOpts | 108122 | 107942 | -180 | -0.17% | 0.17% | | loop-unroll.NumUnrolled | 40136 | 40067 | -69 | -0.17% | 0.17% | | branch-folder.NumDeadBlocks | 130818 | 130607 | -211 | -0.16% | 0.16% | | codegenprepare.NumBlocksElim | 92856 | 92714 | -142 | -0.15% | 0.15% | | instsimplify.NumSimplified | 103263 | 103129 | -134 | -0.13% | 0.13% | | instcombine.NumConstProp | 26070 | 26102 | 32 | 0.12% | 0.12% | | instsimplify.NumExpand | 1716 | 1718 | 2 | 0.12% | 0.12% | | loop-unroll.NumCompletelyUnrolled | 9236 | 9225 | -11 | -0.12% | 0.12% | | branch-folder.NumHoist | 2773 | 2770 | -3 | -0.11% | 0.11% | | regalloc.NumReloadsRemoved | 10822 | 10834 | 12 | 0.11% | 0.11% | | regalloc.NumSnippets | 11394 | 11406 | 12 | 0.11% | 0.11% | | machine-cse.NumCrossBBCSEs | 1052 | 1053 | 1 | 0.10% | 0.10% | | machinelicm.NumCSEed | 99887 | 99784 | -103 | -0.10% | 0.10% | | branch-folder.NumTailMerge | 72501 | 72435 | -66 | -0.09% | 0.09% | | codegenprepare.NumExtUses | 22007 | 21987 | -20 | -0.09% | 0.09% | | local.NumRemoved | 68232 | 68294 | 62 | 0.09% | 0.09% | | loop-vectorize.LoopsAnalyzed | 75483 | 75413 | -70 | -0.09% | 0.09% | ``` Note that i'm only changing current PM, and not touching obsolete PM. This is an alternative to the function simplification pipeline variant of the same change, D112840. It has both less compile time impact (since the additional number of SCEV trip count calculations is way lass less than with the D112840), and it is much more powerful/impactful (almost 2x more loops deleted). I have checked, and doing this after loop rotation is favorable (more loops deleted). Reviewed By: mkazantsev Differential Revision: https://reviews.llvm.org/D112851 --- llvm/lib/Passes/PassBuilderPipelines.cpp | 9 +++- llvm/test/Other/new-pm-defaults.ll | 1 + llvm/test/Other/new-pm-thinlto-defaults.ll | 1 + .../Other/new-pm-thinlto-postlink-pgo-defaults.ll | 1 + .../new-pm-thinlto-postlink-samplepgo-defaults.ll | 1 + ...letion-of-loops-that-became-side-effect-free.ll | 49 ++++------------------ 6 files changed, 18 insertions(+), 44 deletions(-) diff --git a/llvm/lib/Passes/PassBuilderPipelines.cpp b/llvm/lib/Passes/PassBuilderPipelines.cpp index 2009a687ae7d..f0f7803ed3ae 100644 --- a/llvm/lib/Passes/PassBuilderPipelines.cpp +++ b/llvm/lib/Passes/PassBuilderPipelines.cpp @@ -1093,11 +1093,16 @@ PassBuilder::buildModuleOptimizationPipeline(OptimizationLevel Level, for (auto &C : VectorizerStartEPCallbacks) C(OptimizePM, Level); + LoopPassManager LPM; // First rotate loops that may have been un-rotated by prior passes. // Disable header duplication at -Oz. + LPM.addPass(LoopRotatePass(Level != OptimizationLevel::Oz, LTOPreLink)); + // Some loops may have become dead by now. Try to delete them. + // FIXME: see disscussion in https://reviews.llvm.org/D112851 + // this may need to be revisited once GVN is more powerful. + LPM.addPass(LoopDeletionPass()); OptimizePM.addPass(createFunctionToLoopPassAdaptor( - LoopRotatePass(Level != OptimizationLevel::Oz, LTOPreLink), - /*UseMemorySSA=*/false, /*UseBlockFrequencyInfo=*/false)); + std::move(LPM), /*UseMemorySSA=*/false, /*UseBlockFrequencyInfo=*/false)); // Distribute loops to allow partial vectorization. I.e. isolate dependences // into separate loop that would otherwise inhibit vectorization. This is diff --git a/llvm/test/Other/new-pm-defaults.ll b/llvm/test/Other/new-pm-defaults.ll index 5067b6fbdd18..b9f90dad8224 100644 --- a/llvm/test/Other/new-pm-defaults.ll +++ b/llvm/test/Other/new-pm-defaults.ll @@ -216,6 +216,7 @@ ; CHECK-O-NEXT: Running pass: LoopSimplifyPass ; CHECK-O-NEXT: Running pass: LCSSAPass ; CHECK-O-NEXT: Running pass: LoopRotatePass +; CHECK-O-NEXT: Running pass: LoopDeletionPass ; CHECK-O-NEXT: Running pass: LoopDistributePass ; CHECK-O-NEXT: Running pass: InjectTLIMappings ; CHECK-O-NEXT: Running pass: LoopVectorizePass diff --git a/llvm/test/Other/new-pm-thinlto-defaults.ll b/llvm/test/Other/new-pm-thinlto-defaults.ll index 1f52fe47ae73..7836de5c6cce 100644 --- a/llvm/test/Other/new-pm-thinlto-defaults.ll +++ b/llvm/test/Other/new-pm-thinlto-defaults.ll @@ -196,6 +196,7 @@ ; CHECK-POSTLINK-O-NEXT: Running pass: LoopSimplifyPass ; CHECK-POSTLINK-O-NEXT: Running pass: LCSSAPass ; CHECK-POSTLINK-O-NEXT: Running pass: LoopRotatePass +; CHECK-POSTLINK-O-NEXT: Running pass: LoopDeletionPass ; CHECK-POSTLINK-O-NEXT: Running pass: LoopDistributePass ; CHECK-POSTLINK-O-NEXT: Running pass: InjectTLIMappings ; CHECK-POSTLINK-O-NEXT: Running pass: LoopVectorizePass diff --git a/llvm/test/Other/new-pm-thinlto-postlink-pgo-defaults.ll b/llvm/test/Other/new-pm-thinlto-postlink-pgo-defaults.ll index 3a80efba3c56..e66e8672358c 100644 --- a/llvm/test/Other/new-pm-thinlto-postlink-pgo-defaults.ll +++ b/llvm/test/Other/new-pm-thinlto-postlink-pgo-defaults.ll @@ -167,6 +167,7 @@ ; CHECK-O-NEXT: Running pass: LoopSimplifyPass on foo ; CHECK-O-NEXT: Running pass: LCSSAPass on foo ; CHECK-O-NEXT: Running pass: LoopRotatePass +; CHECK-O-NEXT: Running pass: LoopDeletionPass ; CHECK-O-NEXT: Running pass: LoopDistributePass ; CHECK-O-NEXT: Running pass: InjectTLIMappings ; CHECK-O-NEXT: Running pass: LoopVectorizePass diff --git a/llvm/test/Other/new-pm-thinlto-postlink-samplepgo-defaults.ll b/llvm/test/Other/new-pm-thinlto-postlink-samplepgo-defaults.ll index 2e822b21f8a1..410841124c8e 100644 --- a/llvm/test/Other/new-pm-thinlto-postlink-samplepgo-defaults.ll +++ b/llvm/test/Other/new-pm-thinlto-postlink-samplepgo-defaults.ll @@ -179,6 +179,7 @@ ; CHECK-O-NEXT: Running pass: LoopSimplifyPass ; CHECK-O-NEXT: Running pass: LCSSAPass ; CHECK-O-NEXT: Running pass: LoopRotatePass +; CHECK-O-NEXT: Running pass: LoopDeletionPass ; CHECK-O-NEXT: Running pass: LoopDistributePass ; CHECK-O-NEXT: Running pass: InjectTLIMappings ; CHECK-O-NEXT: Running pass: LoopVectorizePass diff --git a/llvm/test/Transforms/PhaseOrdering/deletion-of-loops-that-became-side-effect-free.ll b/llvm/test/Transforms/PhaseOrdering/deletion-of-loops-that-became-side-effect-free.ll index ec8db3cceeb1..99a52acd3b2b 100644 --- a/llvm/test/Transforms/PhaseOrdering/deletion-of-loops-that-became-side-effect-free.ll +++ b/llvm/test/Transforms/PhaseOrdering/deletion-of-loops-that-became-side-effect-free.ll @@ -11,17 +11,8 @@ define dso_local zeroext i1 @is_not_empty_variant1(%struct.node* %p) { ; ALL-LABEL: @is_not_empty_variant1( ; ALL-NEXT: entry: -; ALL-NEXT: [[TOBOOL_NOT3_I:%.*]] = icmp eq %struct.node* [[P:%.*]], null -; ALL-NEXT: br i1 [[TOBOOL_NOT3_I]], label [[COUNT_NODES_VARIANT1_EXIT:%.*]], label [[WHILE_BODY_I:%.*]] -; ALL: while.body.i: -; ALL-NEXT: [[P_ADDR_04_I:%.*]] = phi %struct.node* [ [[TMP0:%.*]], [[WHILE_BODY_I]] ], [ [[P]], [[ENTRY:%.*]] ] -; ALL-NEXT: [[NEXT_I:%.*]] = getelementptr inbounds [[STRUCT_NODE:%.*]], %struct.node* [[P_ADDR_04_I]], i64 0, i32 0 -; ALL-NEXT: [[TMP0]] = load %struct.node*, %struct.node** [[NEXT_I]], align 8 -; ALL-NEXT: [[TOBOOL_NOT_I:%.*]] = icmp eq %struct.node* [[TMP0]], null -; ALL-NEXT: br i1 [[TOBOOL_NOT_I]], label [[COUNT_NODES_VARIANT1_EXIT]], label [[WHILE_BODY_I]], !llvm.loop [[LOOP0:![0-9]+]] -; ALL: count_nodes_variant1.exit: -; ALL-NEXT: [[TMP1:%.*]] = xor i1 [[TOBOOL_NOT3_I]], true -; ALL-NEXT: ret i1 [[TMP1]] +; ALL-NEXT: [[TOBOOL_NOT3_I:%.*]] = icmp ne %struct.node* [[P:%.*]], null +; ALL-NEXT: ret i1 [[TOBOOL_NOT3_I]] ; entry: %p.addr = alloca %struct.node*, align 8 @@ -113,39 +104,13 @@ while.end: define dso_local zeroext i1 @is_not_empty_variant3(%struct.node* %p) { ; O3-LABEL: @is_not_empty_variant3( ; O3-NEXT: entry: -; O3-NEXT: [[TOBOOL_NOT4_I:%.*]] = icmp eq %struct.node* [[P:%.*]], null -; O3-NEXT: br i1 [[TOBOOL_NOT4_I]], label [[COUNT_NODES_VARIANT3_EXIT:%.*]], label [[WHILE_BODY_I:%.*]] -; O3: while.body.i: -; O3-NEXT: [[SIZE_06_I:%.*]] = phi i64 [ [[INC_I:%.*]], [[WHILE_BODY_I]] ], [ 0, [[ENTRY:%.*]] ] -; O3-NEXT: [[P_ADDR_05_I:%.*]] = phi %struct.node* [ [[TMP0:%.*]], [[WHILE_BODY_I]] ], [ [[P]], [[ENTRY]] ] -; O3-NEXT: [[CMP_I:%.*]] = icmp ne i64 [[SIZE_06_I]], -1 -; O3-NEXT: tail call void @llvm.assume(i1 [[CMP_I]]) #[[ATTR3:[0-9]+]] -; O3-NEXT: [[NEXT_I:%.*]] = getelementptr inbounds [[STRUCT_NODE:%.*]], %struct.node* [[P_ADDR_05_I]], i64 0, i32 0 -; O3-NEXT: [[TMP0]] = load %struct.node*, %struct.node** [[NEXT_I]], align 8 -; O3-NEXT: [[INC_I]] = add nuw i64 [[SIZE_06_I]], 1 -; O3-NEXT: [[TOBOOL_NOT_I:%.*]] = icmp eq %struct.node* [[TMP0]], null -; O3-NEXT: br i1 [[TOBOOL_NOT_I]], label [[COUNT_NODES_VARIANT3_EXIT]], label [[WHILE_BODY_I]], !llvm.loop [[LOOP2:![0-9]+]] -; O3: count_nodes_variant3.exit: -; O3-NEXT: [[TMP1:%.*]] = xor i1 [[TOBOOL_NOT4_I]], true -; O3-NEXT: ret i1 [[TMP1]] +; O3-NEXT: [[TOBOOL_NOT4_I:%.*]] = icmp ne %struct.node* [[P:%.*]], null +; O3-NEXT: ret i1 [[TOBOOL_NOT4_I]] ; ; O2-LABEL: @is_not_empty_variant3( ; O2-NEXT: entry: -; O2-NEXT: [[TOBOOL_NOT4_I:%.*]] = icmp eq %struct.node* [[P:%.*]], null -; O2-NEXT: br i1 [[TOBOOL_NOT4_I]], label [[COUNT_NODES_VARIANT3_EXIT:%.*]], label [[WHILE_BODY_I:%.*]] -; O2: while.body.i: -; O2-NEXT: [[SIZE_06_I:%.*]] = phi i64 [ [[INC_I:%.*]], [[WHILE_BODY_I]] ], [ 0, [[ENTRY:%.*]] ] -; O2-NEXT: [[P_ADDR_05_I:%.*]] = phi %struct.node* [ [[TMP0:%.*]], [[WHILE_BODY_I]] ], [ [[P]], [[ENTRY]] ] -; O2-NEXT: [[CMP_I:%.*]] = icmp ne i64 [[SIZE_06_I]], -1 -; O2-NEXT: tail call void @llvm.assume(i1 [[CMP_I]]) #[[ATTR3:[0-9]+]] -; O2-NEXT: [[NEXT_I:%.*]] = getelementptr inbounds [[STRUCT_NODE:%.*]], %struct.node* [[P_ADDR_05_I]], i64 0, i32 0 -; O2-NEXT: [[TMP0]] = load %struct.node*, %struct.node** [[NEXT_I]], align 8 -; O2-NEXT: [[INC_I]] = add nuw i64 [[SIZE_06_I]], 1 -; O2-NEXT: [[TOBOOL_NOT_I:%.*]] = icmp eq %struct.node* [[TMP0]], null -; O2-NEXT: br i1 [[TOBOOL_NOT_I]], label [[COUNT_NODES_VARIANT3_EXIT]], label [[WHILE_BODY_I]], !llvm.loop [[LOOP2:![0-9]+]] -; O2: count_nodes_variant3.exit: -; O2-NEXT: [[TMP1:%.*]] = xor i1 [[TOBOOL_NOT4_I]], true -; O2-NEXT: ret i1 [[TMP1]] +; O2-NEXT: [[TOBOOL_NOT4_I:%.*]] = icmp ne %struct.node* [[P:%.*]], null +; O2-NEXT: ret i1 [[TOBOOL_NOT4_I]] ; ; O1-LABEL: @is_not_empty_variant3( ; O1-NEXT: entry: @@ -160,7 +125,7 @@ define dso_local zeroext i1 @is_not_empty_variant3(%struct.node* %p) { ; O1-NEXT: [[TMP0]] = load %struct.node*, %struct.node** [[NEXT_I]], align 8 ; O1-NEXT: [[INC_I]] = add i64 [[SIZE_06_I]], 1 ; O1-NEXT: [[TOBOOL_NOT_I:%.*]] = icmp eq %struct.node* [[TMP0]], null -; O1-NEXT: br i1 [[TOBOOL_NOT_I]], label [[COUNT_NODES_VARIANT3_EXIT_LOOPEXIT:%.*]], label [[WHILE_BODY_I]], !llvm.loop [[LOOP2:![0-9]+]] +; O1-NEXT: br i1 [[TOBOOL_NOT_I]], label [[COUNT_NODES_VARIANT3_EXIT_LOOPEXIT:%.*]], label [[WHILE_BODY_I]], !llvm.loop [[LOOP0:![0-9]+]] ; O1: count_nodes_variant3.exit.loopexit: ; O1-NEXT: [[PHI_CMP:%.*]] = icmp ne i64 [[INC_I]], 0 ; O1-NEXT: br label [[COUNT_NODES_VARIANT3_EXIT]] </cut>

3 years, 8 months

[ACTIVITY] week ending Nov. 7 2021

by Alex Bennée

VirtIO Initiative ([STR-9]) =========================== - various rust-vmm discussions - [upstream rust-vmm sync meeting] - how to deal with vhost-device/vm-virtio split: [proposal] - synced with ARM on their interests - got update on Fwd: FW: [App-services] Slides from the hypervisor-less virtio status meeting Message-Id: <CAHDbmO2G4hUyfxtaxwnbxsrMk+P41zbL-7VNe=Aa6DshxC-5zQ(a)mail.gmail.com> [STR-9] <https://linaro.atlassian.net/browse/STR-9> [upstream rust-vmm sync meeting] <https://etherpad.opendev.org/p/rust-vmm-sync-2021&sa=D&source=calendar&ust=…> [proposal] <https://github.com/rust-vmm/vhost-device/pull/57> QEMU Upstream Work ([UM-2]) =========================== - did some bug triage and investigated [555] and [690] which might intersect with earlier changes I made - spent time on the PR from hell [PULL 00/30] testing, gdbstub and semihosting Message-Id: <20210115130828.23968-1-alex.bennee(a)linaro.org> [UM-2] <https://linaro.atlassian.net/browse/UM-2> [555] <https://gitlab.com/qemu-project/qemu/-/issues/555> [690] <https://gitlab.com/qemu-project/qemu/-/issues/690> Other ===== - TSC report preparation for QEMU and Stratos Completed Reviews [1/1] ======================= [XEN PATCH v7 00/51] xen: Build system improvements, now with out-of-tree build! Message-Id: <20210824105038.1257926-1-anthony.perard(a)citrix.com> Absences ======== ,---- | (save-excursion | (goto-char (point-min)) | (when (re-search-forward "* Absences") | (goto-char (match-beginning 0)) | (org-export-as 'ascii t nil t ))) `---- Current Review Queue ==================== TODO [PATCH v2 00/48] tcg: optimize redundant sign extensions Message-Id: <20211007195456.1168070-1-richard.henderson(a)linaro.org> ================================================================================================================================ TODO [PATCH] cpu-models-x86.rst: Tidy up a couple of things Message-Id: <20211015100718.17828-1-pbonzini(a)redhat.com> =================================================================================================================== TODO [PATCH 00/16] fdt: Make OF_BOARD a boolean option Message-Id: <20211013010120.96851-1-sjg(a)chromium.org> =========================================================================================================== TODO [PATCH v4 00/41] linux-user: Streamline handling of SIGSEGV Message-Id: <20211006172307.780893-1-richard.henderson(a)linaro.org> ================================================================================================================================== -- Alex Bennée

3 years, 8 months

[ACTIVITY] report week ending 5 Nov

by Peter Maydell

Progress * UM-2 [QEMU upstream maintainership] + worked through the big pile of email that had built up while I was on holiday... + some long-delayed sysadmin tasks on my work machines now I have an opportunity to go into the office and do things that would be too risky with only remote access + triaged a bunch of Coverity issues * QEMU-406 [QEMU support for MVE (M-profile Vector Extension; Helium)] + All work here has now gone upstream; closed! -- PMM

3 years, 8 months

[TCWG CI] 401.bzip2 grew in size by 4% after llvm: Revert "Revert "Recommit "Revert "[CVP] processSwitch: Remove default case when switch cover all possible values.""""

by ci_notify＠linaro.org

After llvm commit c93f93b2e3f28997f794265089fb8138dd5b5f13 Author: Jun Ma <JunMa(a)linux.alibaba.com> Revert "Revert "Recommit "Revert "[CVP] processSwitch: Remove default case when switch cover all possible values."""" the following benchmarks grew in size by more than 1%: - 401.bzip2 grew in size by 4% from 36134 to 37534 bytes - 401.bzip2:[.] BZ2_decompress grew in size by 19% from 7256 to 8656 bytes Below reproducer instructions can be used to re-build both "first_bad" and "last_good" cross-toolchains used in this bisection. Naturally, the scripts will fail when triggerring benchmarking jobs if you don't have access to Linaro TCWG CI. For your convenience, we have uploaded tarballs with pre-processed source and assembly files at: - First_bad save-temps: https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_apm-llvm-master-… - Last_good save-temps: https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_apm-llvm-master-… - Baseline save-temps: https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_apm-llvm-master-… Configuration: - Benchmark: SPEC CPU2006 - Toolchain: Clang + Glibc + LLVM Linker - Version: all components were built from their tip of trunk - Target: arm-linux-gnueabihf - Compiler flags: -Oz -mthumb - Hardware: APM Mustang 8x X-Gene1 This benchmarking CI is work-in-progress, and we welcome feedback and suggestions at linaro-toolchain(a)lists.linaro.org . In our improvement plans is to add support for SPEC CPU2017 benchmarks and provide "perf report/annotate" data behind these reports. THIS IS THE END OF INTERESTING STUFF. BELOW ARE LINKS TO BUILDS, REPRODUCTION INSTRUCTIONS, AND THE RAW COMMIT. This commit has regressed these CI configurations: - tcwg_bmk_llvm_apm/llvm-master-arm-spec2k6-Oz First_bad build: https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_apm-llvm-master-… Last_good build: https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_apm-llvm-master-… Baseline build: https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_apm-llvm-master-… Even more details: https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_apm-llvm-master-… Reproduce builds: <cut> mkdir investigate-llvm-c93f93b2e3f28997f794265089fb8138dd5b5f13 cd investigate-llvm-c93f93b2e3f28997f794265089fb8138dd5b5f13 # Fetch scripts git clone https://git.linaro.org/toolchain/jenkins-scripts # Fetch manifests and test.sh script mkdir -p artifacts/manifests curl -o artifacts/manifests/build-baseline.sh https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_apm-llvm-master-… --fail curl -o artifacts/manifests/build-parameters.sh https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_apm-llvm-master-… --fail curl -o artifacts/test.sh https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_apm-llvm-master-… --fail chmod +x artifacts/test.sh # Reproduce the baseline build (build all pre-requisites) ./jenkins-scripts/tcwg_bmk-build.sh @@ artifacts/manifests/build-baseline.sh # Save baseline build state (which is then restored in artifacts/test.sh) mkdir -p ./bisect rsync -a --del --delete-excluded --exclude /bisect/ --exclude /artifacts/ --exclude /llvm/ ./ ./bisect/baseline/ cd llvm # Reproduce first_bad build git checkout --detach c93f93b2e3f28997f794265089fb8138dd5b5f13 ../artifacts/test.sh # Reproduce last_good build git checkout --detach b4fb42300e39c99ac5bb9d02b304b713fabdec4d ../artifacts/test.sh cd .. </cut> Full commit (up to 1000 lines): <cut> commit c93f93b2e3f28997f794265089fb8138dd5b5f13 Author: Jun Ma <JunMa(a)linux.alibaba.com> Date: Tue Sep 28 09:44:00 2021 +0800 Revert "Revert "Recommit "Revert "[CVP] processSwitch: Remove default case when switch cover all possible values."""" This reverts commit 3a998c06a8e93989319238e12b56a731198cc1c2. --- llvm/include/llvm/Transforms/Utils/Local.h | 5 ++++ .../Scalar/CorrelatedValuePropagation.cpp | 27 +++++++++++++++++++++- llvm/lib/Transforms/Utils/Local.cpp | 20 ++++++++++++++++ llvm/lib/Transforms/Utils/SimplifyCFG.cpp | 20 ---------------- .../Transforms/CorrelatedValuePropagation/basic.ll | 11 +++++---- 5 files changed, 57 insertions(+), 26 deletions(-) diff --git a/llvm/include/llvm/Transforms/Utils/Local.h b/llvm/include/llvm/Transforms/Utils/Local.h index 3c529abce85a..72cb606eb51a 100644 --- a/llvm/include/llvm/Transforms/Utils/Local.h +++ b/llvm/include/llvm/Transforms/Utils/Local.h @@ -55,6 +55,7 @@ class MDNode; class MemorySSAUpdater; class PHINode; class StoreInst; +class SwitchInst; class TargetLibraryInfo; class TargetTransformInfo; @@ -237,6 +238,10 @@ CallInst *createCallMatchingInvoke(InvokeInst *II); /// This function converts the specified invoek into a normall call. void changeToCall(InvokeInst *II, DomTreeUpdater *DTU = nullptr); +/// This function removes the default destination from the specified switch. +void createUnreachableSwitchDefault(SwitchInst *Switch, + DomTreeUpdater *DTU = nullptr); + ///===---------------------------------------------------------------------===// /// Dbg Intrinsic utilities /// diff --git a/llvm/lib/Transforms/Scalar/CorrelatedValuePropagation.cpp b/llvm/lib/Transforms/Scalar/CorrelatedValuePropagation.cpp index 6dbd3da24059..4b8392db9628 100644 --- a/llvm/lib/Transforms/Scalar/CorrelatedValuePropagation.cpp +++ b/llvm/lib/Transforms/Scalar/CorrelatedValuePropagation.cpp @@ -341,7 +341,13 @@ static bool processSwitch(SwitchInst *I, LazyValueInfo *LVI, // ConstantFoldTerminator() as the underlying SwitchInst can be changed. SwitchInstProfUpdateWrapper SI(*I); - for (auto CI = SI->case_begin(), CE = SI->case_end(); CI != CE;) { + APInt Low = + APInt::getSignedMaxValue(Cond->getType()->getScalarSizeInBits()); + APInt High = + APInt::getSignedMinValue(Cond->getType()->getScalarSizeInBits()); + + SwitchInst::CaseIt CI = SI->case_begin(); + for (auto CE = SI->case_end(); CI != CE;) { ConstantInt *Case = CI->getCaseValue(); LazyValueInfo::Tristate State = LVI->getPredicateAt(CmpInst::ICMP_EQ, Cond, Case, I, @@ -374,9 +380,28 @@ static bool processSwitch(SwitchInst *I, LazyValueInfo *LVI, break; } + // Get Lower/Upper bound from switch cases. + Low = APIntOps::smin(Case->getValue(), Low); + High = APIntOps::smax(Case->getValue(), High); + // Increment the case iterator since we didn't delete it. ++CI; } + + // Try to simplify default case as unreachable + if (CI == SI->case_end() && SI->getNumCases() != 0 && + !isa<UnreachableInst>(SI->getDefaultDest()->getFirstNonPHIOrDbg())) { + const ConstantRange SIRange = + LVI->getConstantRange(SI->getCondition(), SI); + + // If the numbered switch cases cover the entire range of the condition, + // then the default case is not reachable. + if (SIRange.getSignedMin() == Low && SIRange.getSignedMax() == High && + SI->getNumCases() == High - Low + 1) { + createUnreachableSwitchDefault(SI, &DTU); + Changed = true; + } + } } if (Changed) diff --git a/llvm/lib/Transforms/Utils/Local.cpp b/llvm/lib/Transforms/Utils/Local.cpp index 3e36f498523d..74ab37fadf36 100644 --- a/llvm/lib/Transforms/Utils/Local.cpp +++ b/llvm/lib/Transforms/Utils/Local.cpp @@ -2190,6 +2190,26 @@ void llvm::changeToCall(InvokeInst *II, DomTreeUpdater *DTU) { DTU->applyUpdates({{DominatorTree::Delete, BB, UnwindDestBB}}); } +void llvm::createUnreachableSwitchDefault(SwitchInst *Switch, + DomTreeUpdater *DTU) { + LLVM_DEBUG(dbgs() << "SimplifyCFG: switch default is dead.\n"); + auto *BB = Switch->getParent(); + auto *OrigDefaultBlock = Switch->getDefaultDest(); + OrigDefaultBlock->removePredecessor(BB); + BasicBlock *NewDefaultBlock = BasicBlock::Create( + BB->getContext(), BB->getName() + ".unreachabledefault", BB->getParent(), + OrigDefaultBlock); + new UnreachableInst(Switch->getContext(), NewDefaultBlock); + Switch->setDefaultDest(&*NewDefaultBlock); + if (DTU) { + SmallVector<DominatorTree::UpdateType, 2> Updates; + Updates.push_back({DominatorTree::Insert, BB, &*NewDefaultBlock}); + if (!is_contained(successors(BB), OrigDefaultBlock)) + Updates.push_back({DominatorTree::Delete, BB, &*OrigDefaultBlock}); + DTU->applyUpdates(Updates); + } +} + BasicBlock *llvm::changeToInvokeAndSplitBasicBlock(CallInst *CI, BasicBlock *UnwindEdge, DomTreeUpdater *DTU) { diff --git a/llvm/lib/Transforms/Utils/SimplifyCFG.cpp b/llvm/lib/Transforms/Utils/SimplifyCFG.cpp index 7b49f47778e0..3eab293b433e 100644 --- a/llvm/lib/Transforms/Utils/SimplifyCFG.cpp +++ b/llvm/lib/Transforms/Utils/SimplifyCFG.cpp @@ -4782,26 +4782,6 @@ static bool CasesAreContiguous(SmallVectorImpl<ConstantInt *> &Cases) { return true; } -static void createUnreachableSwitchDefault(SwitchInst *Switch, - DomTreeUpdater *DTU) { - LLVM_DEBUG(dbgs() << "SimplifyCFG: switch default is dead.\n"); - auto *BB = Switch->getParent(); - auto *OrigDefaultBlock = Switch->getDefaultDest(); - OrigDefaultBlock->removePredecessor(BB); - BasicBlock *NewDefaultBlock = BasicBlock::Create( - BB->getContext(), BB->getName() + ".unreachabledefault", BB->getParent(), - OrigDefaultBlock); - new UnreachableInst(Switch->getContext(), NewDefaultBlock); - Switch->setDefaultDest(&*NewDefaultBlock); - if (DTU) { - SmallVector<DominatorTree::UpdateType, 2> Updates; - Updates.push_back({DominatorTree::Insert, BB, &*NewDefaultBlock}); - if (!is_contained(successors(BB), OrigDefaultBlock)) - Updates.push_back({DominatorTree::Delete, BB, &*OrigDefaultBlock}); - DTU->applyUpdates(Updates); - } -} - /// Turn a switch with two reachable destinations into an integer range /// comparison and branch. bool SimplifyCFGOpt::TurnSwitchRangeIntoICmp(SwitchInst *SI, diff --git a/llvm/test/Transforms/CorrelatedValuePropagation/basic.ll b/llvm/test/Transforms/CorrelatedValuePropagation/basic.ll index 5abbcbc90e01..a620c8468d4d 100644 --- a/llvm/test/Transforms/CorrelatedValuePropagation/basic.ll +++ b/llvm/test/Transforms/CorrelatedValuePropagation/basic.ll @@ -382,7 +382,7 @@ define i32 @switch_range(i32 %cond) { ; CHECK-NEXT: entry: ; CHECK-NEXT: [[S:%.*]] = urem i32 [[COND:%.*]], 3 ; CHECK-NEXT: [[S1:%.*]] = add nuw nsw i32 [[S]], 1 -; CHECK-NEXT: switch i32 [[S1]], label [[UNREACHABLE:%.*]] [ +; CHECK-NEXT: switch i32 [[S1]], label [[ENTRY_UNREACHABLEDEFAULT:%.*]] [ ; CHECK-NEXT: i32 1, label [[EXIT1:%.*]] ; CHECK-NEXT: i32 2, label [[EXIT2:%.*]] ; CHECK-NEXT: i32 3, label [[EXIT1]] @@ -391,6 +391,8 @@ define i32 @switch_range(i32 %cond) { ; CHECK-NEXT: ret i32 1 ; CHECK: exit2: ; CHECK-NEXT: ret i32 2 +; CHECK: entry.unreachabledefault: +; CHECK-NEXT: unreachable ; CHECK: unreachable: ; CHECK-NEXT: ret i32 0 ; @@ -453,10 +455,9 @@ define i8 @switch_defaultdest_multipleuse(i8 %t0) { ; CHECK-NEXT: entry: ; CHECK-NEXT: [[O:%.*]] = or i8 [[T0:%.*]], 1 ; CHECK-NEXT: [[R:%.*]] = srem i8 1, [[O]] -; CHECK-NEXT: switch i8 [[R]], label [[EXIT:%.*]] [ -; CHECK-NEXT: i8 0, label [[EXIT]] -; CHECK-NEXT: i8 1, label [[EXIT]] -; CHECK-NEXT: ] +; CHECK-NEXT: br label [[EXIT:%.*]] +; CHECK: entry.unreachabledefault: +; CHECK-NEXT: unreachable ; CHECK: exit: ; CHECK-NEXT: ret i8 0 ; </cut>

3 years, 8 months

[TCWG CI] 464.h264ref slowed down by 7% after llvm: [BasicAA] Handle known bits as ranges

by ci_notify＠linaro.org

After llvm commit fbc0c308d599fe3300ab6516650b65b41979446d Author: Nikita Popov <nikita.ppv(a)gmail.com> [BasicAA] Handle known bits as ranges the following benchmarks slowed down by more than 2%: - 464.h264ref slowed down by 7% from 10899 to 11610 perf samples - 464.h264ref:libc.so.6 slowed down by 11% from 3538 to 3922 perf samples Below reproducer instructions can be used to re-build both "first_bad" and "last_good" cross-toolchains used in this bisection. Naturally, the scripts will fail when triggerring benchmarking jobs if you don't have access to Linaro TCWG CI. For your convenience, we have uploaded tarballs with pre-processed source and assembly files at: - First_bad save-temps: https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_tx1-llvm-master-… - Last_good save-temps: https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_tx1-llvm-master-… - Baseline save-temps: https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_tx1-llvm-master-… Configuration: - Benchmark: SPEC CPU2006 - Toolchain: Clang + Glibc + LLVM Linker - Version: all components were built from their tip of trunk - Target: aarch64-linux-gnu - Compiler flags: -O2 -flto - Hardware: NVidia TX1 4x Cortex-A57 This benchmarking CI is work-in-progress, and we welcome feedback and suggestions at linaro-toolchain(a)lists.linaro.org . In our improvement plans is to add support for SPEC CPU2017 benchmarks and provide "perf report/annotate" data behind these reports. THIS IS THE END OF INTERESTING STUFF. BELOW ARE LINKS TO BUILDS, REPRODUCTION INSTRUCTIONS, AND THE RAW COMMIT. This commit has regressed these CI configurations: - tcwg_bmk_llvm_tx1/llvm-master-aarch64-spec2k6-O2_LTO First_bad build: https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_tx1-llvm-master-… Last_good build: https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_tx1-llvm-master-… Baseline build: https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_tx1-llvm-master-… Even more details: https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_tx1-llvm-master-… Reproduce builds: <cut> mkdir investigate-llvm-fbc0c308d599fe3300ab6516650b65b41979446d cd investigate-llvm-fbc0c308d599fe3300ab6516650b65b41979446d # Fetch scripts git clone https://git.linaro.org/toolchain/jenkins-scripts # Fetch manifests and test.sh script mkdir -p artifacts/manifests curl -o artifacts/manifests/build-baseline.sh https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_tx1-llvm-master-… --fail curl -o artifacts/manifests/build-parameters.sh https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_tx1-llvm-master-… --fail curl -o artifacts/test.sh https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_tx1-llvm-master-… --fail chmod +x artifacts/test.sh # Reproduce the baseline build (build all pre-requisites) ./jenkins-scripts/tcwg_bmk-build.sh @@ artifacts/manifests/build-baseline.sh # Save baseline build state (which is then restored in artifacts/test.sh) mkdir -p ./bisect rsync -a --del --delete-excluded --exclude /bisect/ --exclude /artifacts/ --exclude /llvm/ ./ ./bisect/baseline/ cd llvm # Reproduce first_bad build git checkout --detach fbc0c308d599fe3300ab6516650b65b41979446d ../artifacts/test.sh # Reproduce last_good build git checkout --detach 30a3652b6ade43504087f6e3acd8dc879055f501 ../artifacts/test.sh cd .. </cut> Full commit (up to 1000 lines): <cut> commit fbc0c308d599fe3300ab6516650b65b41979446d Author: Nikita Popov <nikita.ppv(a)gmail.com> Date: Mon Oct 25 15:47:21 2021 +0200 [BasicAA] Handle known bits as ranges BasicAA currently tries to determine that the offset is positive by checking whether all variable indices are positive based on known bits, multiplied by a positive scale. However, this is incorrect if the scale multiplication might overflow. In the modified test case the original value is positive, but may be negative after a left shift. Fix this by converting known bits into a constant range and reusing the range-based logic, which handles overflow correctly. Differential Revision: https://reviews.llvm.org/D112611 --- llvm/lib/Analysis/BasicAliasAnalysis.cpp | 51 +++++----------------- .../test/Analysis/BasicAA/assume-index-positive.ll | 4 +- 2 files changed, 12 insertions(+), 43 deletions(-) diff --git a/llvm/lib/Analysis/BasicAliasAnalysis.cpp b/llvm/lib/Analysis/BasicAliasAnalysis.cpp index 0305732ca5d5..8cf947c43bf4 100644 --- a/llvm/lib/Analysis/BasicAliasAnalysis.cpp +++ b/llvm/lib/Analysis/BasicAliasAnalysis.cpp @@ -318,15 +318,6 @@ struct CastedValue { return N; } - KnownBits evaluateWith(KnownBits N) const { - assert(N.getBitWidth() == V->getType()->getPrimitiveSizeInBits() && - "Incompatible bit width"); - if (TruncBits) N = N.trunc(N.getBitWidth() - TruncBits); - if (SExtBits) N = N.sext(N.getBitWidth() + SExtBits); - if (ZExtBits) N = N.zext(N.getBitWidth() + ZExtBits); - return N; - } - ConstantRange evaluateWith(ConstantRange N) const { assert(N.getBitWidth() == V->getType()->getPrimitiveSizeInBits() && "Incompatible bit width"); @@ -1250,8 +1241,6 @@ AliasResult BasicAAResult::aliasGEP( if (!DecompGEP1.VarIndices.empty()) { APInt GCD; - bool AllNonNegative = DecompGEP1.Offset.isNonNegative(); - bool AllNonPositive = DecompGEP1.Offset.isNonPositive(); ConstantRange OffsetRange = ConstantRange(DecompGEP1.Offset); for (unsigned i = 0, e = DecompGEP1.VarIndices.size(); i != e; ++i) { const VariableGEPIndex &Index = DecompGEP1.VarIndices[i]; @@ -1266,24 +1255,19 @@ AliasResult BasicAAResult::aliasGEP( else GCD = APIntOps::GreatestCommonDivisor(GCD, ScaleForGCD.abs()); - if (AllNonNegative || AllNonPositive) { - KnownBits Known = Index.Val.evaluateWith( - computeKnownBits(Index.Val.V, DL, 0, &AC, Index.CxtI, DT)); - bool SignKnownZero = Known.isNonNegative(); - bool SignKnownOne = Known.isNegative(); - AllNonNegative &= (SignKnownZero && Scale.isNonNegative()) || - (SignKnownOne && Scale.isNonPositive()); - AllNonPositive &= (SignKnownZero && Scale.isNonPositive()) || - (SignKnownOne && Scale.isNonNegative()); - } + ConstantRange CR = + computeConstantRange(Index.Val.V, true, &AC, Index.CxtI); + KnownBits Known = + computeKnownBits(Index.Val.V, DL, 0, &AC, Index.CxtI, DT); + CR = CR.intersectWith( + ConstantRange::fromKnownBits(Known, /* Signed */ true), + ConstantRange::Signed); assert(OffsetRange.getBitWidth() == Scale.getBitWidth() && "Bit widths are normalized to MaxPointerSize"); - OffsetRange = OffsetRange.add(Index.Val - .evaluateWith(computeConstantRange( - Index.Val.V, true, &AC, Index.CxtI)) - .sextOrTrunc(OffsetRange.getBitWidth()) - .smul_fast(ConstantRange(Scale))); + OffsetRange = OffsetRange.add( + Index.Val.evaluateWith(CR).sextOrTrunc(OffsetRange.getBitWidth()) + .smul_fast(ConstantRange(Scale))); } // We now have accesses at two offsets from the same base: @@ -1300,21 +1284,6 @@ AliasResult BasicAAResult::aliasGEP( (GCD - ModOffset).uge(V1Size.getValue())) return AliasResult::NoAlias; - // If we know all the variables are non-negative, then the total offset is - // also non-negative and >= DecompGEP1.Offset. We have the following layout: - // [0, V2Size) ... [TotalOffset, TotalOffer+V1Size] - // If DecompGEP1.Offset >= V2Size, the accesses don't alias. - if (AllNonNegative && V2Size.hasValue() && - DecompGEP1.Offset.uge(V2Size.getValue())) - return AliasResult::NoAlias; - // Similarly, if the variables are non-positive, then the total offset is - // also non-positive and <= DecompGEP1.Offset. We have the following layout: - // [TotalOffset, TotalOffset+V1Size) ... [0, V2Size) - // If -DecompGEP1.Offset >= V1Size, the accesses don't alias. - if (AllNonPositive && V1Size.hasValue() && - (-DecompGEP1.Offset).uge(V1Size.getValue())) - return AliasResult::NoAlias; - if (V1Size.hasValue() && V2Size.hasValue()) { // Compute ranges of potentially accessed bytes for both accesses. If the // interseciton is empty, there can be no overlap. diff --git a/llvm/test/Analysis/BasicAA/assume-index-positive.ll b/llvm/test/Analysis/BasicAA/assume-index-positive.ll index 451592067f4b..a53fff2c6009 100644 --- a/llvm/test/Analysis/BasicAA/assume-index-positive.ll +++ b/llvm/test/Analysis/BasicAA/assume-index-positive.ll @@ -130,12 +130,12 @@ define void @symmetry([0 x i8]* %ptr, i32 %a, i32 %b, i32 %c) { ret void } -; TODO: %ptr.neg and %ptr.shl may alias, as the shl renders the previously +; %ptr.neg and %ptr.shl may alias, as the shl renders the previously ; non-negative value potentially negative. define void @shl_of_non_negative(i8* %ptr, i64 %a) { ; CHECK-LABEL: Function: shl_of_non_negative ; CHECK: NoAlias: i8* %ptr.a, i8* %ptr.neg -; CHECK: NoAlias: i8* %ptr.neg, i8* %ptr.shl +; CHECK: MayAlias: i8* %ptr.neg, i8* %ptr.shl %a.cmp = icmp sge i64 %a, 0 call void @llvm.assume(i1 %a.cmp) %ptr.neg = getelementptr i8, i8* %ptr, i64 -2 </cut>

3 years, 8 months

[TCWG CI] 400.perlbench:[.] S_find_byclass slowed down by 12% after llvm: [ORC] Call ExecutorProcessControl::disconnect in unit tests that require it.

by ci_notify＠linaro.org

After llvm commit adf55ac6657693f7bfbe3087b599b4031a765a44 Author: Lang Hames <lhames(a)gmail.com> [ORC] Call ExecutorProcessControl::disconnect in unit tests that require it. the following hot functions slowed down by more than 10% (but their benchmarks slowed down by less than 2%): - 400.perlbench:[.] S_find_byclass slowed down by 12% from 644 to 721 perf samples Below reproducer instructions can be used to re-build both "first_bad" and "last_good" cross-toolchains used in this bisection. Naturally, the scripts will fail when triggerring benchmarking jobs if you don't have access to Linaro TCWG CI. For your convenience, we have uploaded tarballs with pre-processed source and assembly files at: - First_bad save-temps: https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_tx1-llvm-master-… - Last_good save-temps: https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_tx1-llvm-master-… - Baseline save-temps: https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_tx1-llvm-master-… Configuration: - Benchmark: SPEC CPU2006 - Toolchain: Clang + Glibc + LLVM Linker - Version: all components were built from their tip of trunk - Target: aarch64-linux-gnu - Compiler flags: -O2 - Hardware: NVidia TX1 4x Cortex-A57 This benchmarking CI is work-in-progress, and we welcome feedback and suggestions at linaro-toolchain(a)lists.linaro.org . In our improvement plans is to add support for SPEC CPU2017 benchmarks and provide "perf report/annotate" data behind these reports. THIS IS THE END OF INTERESTING STUFF. BELOW ARE LINKS TO BUILDS, REPRODUCTION INSTRUCTIONS, AND THE RAW COMMIT. This commit has regressed these CI configurations: - tcwg_bmk_llvm_tx1/llvm-master-aarch64-spec2k6-O2 First_bad build: https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_tx1-llvm-master-… Last_good build: https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_tx1-llvm-master-… Baseline build: https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_tx1-llvm-master-… Even more details: https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_tx1-llvm-master-… Reproduce builds: <cut> mkdir investigate-llvm-adf55ac6657693f7bfbe3087b599b4031a765a44 cd investigate-llvm-adf55ac6657693f7bfbe3087b599b4031a765a44 # Fetch scripts git clone https://git.linaro.org/toolchain/jenkins-scripts # Fetch manifests and test.sh script mkdir -p artifacts/manifests curl -o artifacts/manifests/build-baseline.sh https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_tx1-llvm-master-… --fail curl -o artifacts/manifests/build-parameters.sh https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_tx1-llvm-master-… --fail curl -o artifacts/test.sh https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_tx1-llvm-master-… --fail chmod +x artifacts/test.sh # Reproduce the baseline build (build all pre-requisites) ./jenkins-scripts/tcwg_bmk-build.sh @@ artifacts/manifests/build-baseline.sh # Save baseline build state (which is then restored in artifacts/test.sh) mkdir -p ./bisect rsync -a --del --delete-excluded --exclude /bisect/ --exclude /artifacts/ --exclude /llvm/ ./ ./bisect/baseline/ cd llvm # Reproduce first_bad build git checkout --detach adf55ac6657693f7bfbe3087b599b4031a765a44 ../artifacts/test.sh # Reproduce last_good build git checkout --detach f526ee5b8517b60620cd03bb3e5945ed69d6bfaa ../artifacts/test.sh cd .. </cut> Full commit (up to 1000 lines): <cut> commit adf55ac6657693f7bfbe3087b599b4031a765a44 Author: Lang Hames <lhames(a)gmail.com> Date: Tue Oct 12 14:55:49 2021 -0700 [ORC] Call ExecutorProcessControl::disconnect in unit tests that require it. Another follow-up to 2815ed57e3c and 19b4e3cfc6a. For unit tests that don't use an ExecutionSession we need to call ExecutorProcessControl::disconnect directly to wait for the dispatcher to shut down. https://llvm.org/PR52153 --- .../ExecutionEngine/Orc/EPCGenericJITLinkMemoryManagerTest.cpp | 2 ++ llvm/unittests/ExecutionEngine/Orc/EPCGenericMemoryAccessTest.cpp | 2 ++ 2 files changed, 4 insertions(+) diff --git a/llvm/unittests/ExecutionEngine/Orc/EPCGenericJITLinkMemoryManagerTest.cpp b/llvm/unittests/ExecutionEngine/Orc/EPCGenericJITLinkMemoryManagerTest.cpp index f2b157e424b6..a95435aec2a3 100644 --- a/llvm/unittests/ExecutionEngine/Orc/EPCGenericJITLinkMemoryManagerTest.cpp +++ b/llvm/unittests/ExecutionEngine/Orc/EPCGenericJITLinkMemoryManagerTest.cpp @@ -134,6 +134,8 @@ TEST(EPCGenericJITLinkMemoryManagerTest, AllocFinalizeFree) { auto Err2 = MemMgr->deallocate(std::move(*FA)); EXPECT_THAT_ERROR(std::move(Err2), Succeeded()); + + cantFail(SelfEPC->disconnect()); } } // namespace diff --git a/llvm/unittests/ExecutionEngine/Orc/EPCGenericMemoryAccessTest.cpp b/llvm/unittests/ExecutionEngine/Orc/EPCGenericMemoryAccessTest.cpp index 78024644ca8b..beb0fefa094a 100644 --- a/llvm/unittests/ExecutionEngine/Orc/EPCGenericMemoryAccessTest.cpp +++ b/llvm/unittests/ExecutionEngine/Orc/EPCGenericMemoryAccessTest.cpp @@ -93,6 +93,8 @@ TEST(EPCGenericMemoryAccessTest, MemWrites) { {{pointerToJITTargetAddress(&Test_Buffer), TestMsg}}); EXPECT_THAT_ERROR(std::move(Err5), Succeeded()); EXPECT_EQ(StringRef(Test_Buffer, TestMsg.size()), TestMsg); + + cantFail(SelfEPC->disconnect()); } } // namespace </cut>

3 years, 8 months

[TCWG CI] 400.perlbench slowed down by 6% after llvm: [AArch64] Remove redundant ORRWrs which is generated by zero-extend

by ci_notify＠linaro.org

After llvm commit a502436259307f95e9c95437d8a1d2d07294341c Author: Jingu Kang <jingu.kang(a)arm.com> [AArch64] Remove redundant ORRWrs which is generated by zero-extend the following benchmarks slowed down by more than 2%: - 400.perlbench slowed down by 6% from 9792 to 10354 perf samples - 464.h264ref slowed down by 4% from 11023 to 11509 perf samples - 464.h264ref:[.] FastFullPelBlockMotionSearch slowed down by 33% from 1634 to 2180 perf samples Below reproducer instructions can be used to re-build both "first_bad" and "last_good" cross-toolchains used in this bisection. Naturally, the scripts will fail when triggerring benchmarking jobs if you don't have access to Linaro TCWG CI. For your convenience, we have uploaded tarballs with pre-processed source and assembly files at: - First_bad save-temps: https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_tx1-llvm-master-… - Last_good save-temps: https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_tx1-llvm-master-… - Baseline save-temps: https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_tx1-llvm-master-… Configuration: - Benchmark: SPEC CPU2006 - Toolchain: Clang + Glibc + LLVM Linker - Version: all components were built from their tip of trunk - Target: aarch64-linux-gnu - Compiler flags: -O3 - Hardware: NVidia TX1 4x Cortex-A57 This benchmarking CI is work-in-progress, and we welcome feedback and suggestions at linaro-toolchain(a)lists.linaro.org . In our improvement plans is to add support for SPEC CPU2017 benchmarks and provide "perf report/annotate" data behind these reports. THIS IS THE END OF INTERESTING STUFF. BELOW ARE LINKS TO BUILDS, REPRODUCTION INSTRUCTIONS, AND THE RAW COMMIT. This commit has regressed these CI configurations: - tcwg_bmk_llvm_tx1/llvm-master-aarch64-spec2k6-O3 First_bad build: https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_tx1-llvm-master-… Last_good build: https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_tx1-llvm-master-… Baseline build: https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_tx1-llvm-master-… Even more details: https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_tx1-llvm-master-… Reproduce builds: <cut> mkdir investigate-llvm-a502436259307f95e9c95437d8a1d2d07294341c cd investigate-llvm-a502436259307f95e9c95437d8a1d2d07294341c # Fetch scripts git clone https://git.linaro.org/toolchain/jenkins-scripts # Fetch manifests and test.sh script mkdir -p artifacts/manifests curl -o artifacts/manifests/build-baseline.sh https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_tx1-llvm-master-… --fail curl -o artifacts/manifests/build-parameters.sh https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_tx1-llvm-master-… --fail curl -o artifacts/test.sh https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_tx1-llvm-master-… --fail chmod +x artifacts/test.sh # Reproduce the baseline build (build all pre-requisites) ./jenkins-scripts/tcwg_bmk-build.sh @@ artifacts/manifests/build-baseline.sh # Save baseline build state (which is then restored in artifacts/test.sh) mkdir -p ./bisect rsync -a --del --delete-excluded --exclude /bisect/ --exclude /artifacts/ --exclude /llvm/ ./ ./bisect/baseline/ cd llvm # Reproduce first_bad build git checkout --detach a502436259307f95e9c95437d8a1d2d07294341c ../artifacts/test.sh # Reproduce last_good build git checkout --detach 6fa1b4ff4b05b9b9a432f7310802255c160c8f4f ../artifacts/test.sh cd .. </cut> Full commit (up to 1000 lines): <cut> commit a502436259307f95e9c95437d8a1d2d07294341c Author: Jingu Kang <jingu.kang(a)arm.com> Date: Thu Sep 30 15:39:10 2021 +0100 [AArch64] Remove redundant ORRWrs which is generated by zero-extend %3:gpr32 = ORRWrs $wzr, %2, 0 %4:gpr64 = SUBREG_TO_REG 0, %3, %subreg.sub_32 If AArch64's 32-bit form of instruction defines the source operand of ORRWrs, we can remove the ORRWrs because the upper 32 bits of the source operand are set to zero. Differential Revision: https://reviews.llvm.org/D110841 --- llvm/lib/Target/AArch64/AArch64MIPeepholeOpt.cpp | 57 ++++++++++++++++ .../test/CodeGen/AArch64/arm64-assert-zext-sext.ll | 51 +++++++++++--- .../AArch64/redundant-mov-from-zero-extend.ll | 79 ++++++++++++++++++++++ .../AArch64/redundant-orrwrs-from-zero-extend.mir | 69 +++++++++++++++++++ 4 files changed, 248 insertions(+), 8 deletions(-) diff --git a/llvm/lib/Target/AArch64/AArch64MIPeepholeOpt.cpp b/llvm/lib/Target/AArch64/AArch64MIPeepholeOpt.cpp index 42f683613698..42db18332f1c 100644 --- a/llvm/lib/Target/AArch64/AArch64MIPeepholeOpt.cpp +++ b/llvm/lib/Target/AArch64/AArch64MIPeepholeOpt.cpp @@ -15,6 +15,16 @@ // later. In this case, we could try to split the constant operand of mov // instruction into two bitmask immediates. It makes two AND instructions // intead of multiple `mov` + `and` instructions. +// +// 2. Remove redundant ORRWrs which is generated by zero-extend. +// +// %3:gpr32 = ORRWrs $wzr, %2, 0 +// %4:gpr64 = SUBREG_TO_REG 0, %3, %subreg.sub_32 +// +// If AArch64's 32-bit form of instruction defines the source operand of +// ORRWrs, we can remove the ORRWrs because the upper 32 bits of the source +// operand are set to zero. +// //===----------------------------------------------------------------------===// #include "AArch64ExpandImm.h" @@ -44,6 +54,8 @@ struct AArch64MIPeepholeOpt : public MachineFunctionPass { template <typename T> bool visitAND(MachineInstr &MI, SmallSetVector<MachineInstr *, 8> &ToBeRemoved); + bool visitORR(MachineInstr &MI, + SmallSetVector<MachineInstr *, 8> &ToBeRemoved); bool runOnMachineFunction(MachineFunction &MF) override; StringRef getPassName() const override { @@ -196,6 +208,49 @@ bool AArch64MIPeepholeOpt::visitAND( return true; } +bool AArch64MIPeepholeOpt::visitORR( + MachineInstr &MI, SmallSetVector<MachineInstr *, 8> &ToBeRemoved) { + // Check this ORR comes from below zero-extend pattern. + // + // def : Pat<(i64 (zext GPR32:$src)), + // (SUBREG_TO_REG (i32 0), (ORRWrs WZR, GPR32:$src, 0), sub_32)>; + if (MI.getOperand(3).getImm() != 0) + return false; + + if (MI.getOperand(1).getReg() != AArch64::WZR) + return false; + + MachineInstr *SrcMI = MRI->getUniqueVRegDef(MI.getOperand(2).getReg()); + if (!SrcMI) + return false; + + // From https://developer.arm.com/documentation/dui0801/b/BABBGCAC + // + // When you use the 32-bit form of an instruction, the upper 32 bits of the + // source registers are ignored and the upper 32 bits of the destination + // register are set to zero. + // + // If AArch64's 32-bit form of instruction defines the source operand of + // zero-extend, we do not need the zero-extend. Let's check the MI's opcode is + // real AArch64 instruction and if it is not, do not process the opcode + // conservatively. + if (SrcMI->getOpcode() <= TargetOpcode::GENERIC_OP_END) + return false; + + Register DefReg = MI.getOperand(0).getReg(); + Register SrcReg = MI.getOperand(2).getReg(); + MRI->replaceRegWith(DefReg, SrcReg); + MRI->clearKillFlags(SrcReg); + // replaceRegWith changes MI's definition register. Keep it for SSA form until + // deleting MI. + MI.getOperand(0).setReg(DefReg); + ToBeRemoved.insert(&MI); + + LLVM_DEBUG({ dbgs() << "Removed: " << MI << "\n"; }); + + return true; +} + bool AArch64MIPeepholeOpt::runOnMachineFunction(MachineFunction &MF) { if (skipFunction(MF.getFunction())) return false; @@ -221,6 +276,8 @@ bool AArch64MIPeepholeOpt::runOnMachineFunction(MachineFunction &MF) { case AArch64::ANDXrr: Changed = visitAND<uint64_t>(MI, ToBeRemoved); break; + case AArch64::ORRWrs: + Changed = visitORR(MI, ToBeRemoved); } } } diff --git a/llvm/test/CodeGen/AArch64/arm64-assert-zext-sext.ll b/llvm/test/CodeGen/AArch64/arm64-assert-zext-sext.ll index 07dd0b4ec56b..df4a9010dfa9 100644 --- a/llvm/test/CodeGen/AArch64/arm64-assert-zext-sext.ll +++ b/llvm/test/CodeGen/AArch64/arm64-assert-zext-sext.ll @@ -1,9 +1,32 @@ +; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py ; RUN: llc -O2 -mtriple=aarch64-linux-gnu < %s | FileCheck %s declare i32 @test(i32) local_unnamed_addr declare i32 @test1(i64) local_unnamed_addr define i32 @assertzext(i32 %n, i1 %a, i32* %b) local_unnamed_addr { +; CHECK-LABEL: assertzext: +; CHECK: // %bb.0: // %entry +; CHECK-NEXT: stp x30, x19, [sp, #-16]! // 16-byte Folded Spill +; CHECK-NEXT: .cfi_def_cfa_offset 16 +; CHECK-NEXT: .cfi_offset w19, -8 +; CHECK-NEXT: .cfi_offset w30, -16 +; CHECK-NEXT: mov w8, #33066 +; CHECK-NEXT: tst w1, #0x1 +; CHECK-NEXT: movk w8, #28567, lsl #16 +; CHECK-NEXT: csel w19, wzr, w8, ne +; CHECK-NEXT: cbnz w0, .LBB0_2 +; CHECK-NEXT: // %bb.1: // %if.then +; CHECK-NEXT: mov w19, wzr +; CHECK-NEXT: str wzr, [x2] +; CHECK-NEXT: .LBB0_2: // %if.end +; CHECK-NEXT: mov w0, w19 +; CHECK-NEXT: bl test +; CHECK-NEXT: mov w0, w19 +; CHECK-NEXT: bl test1 +; CHECK-NEXT: mov w0, wzr +; CHECK-NEXT: ldp x30, x19, [sp], #16 // 16-byte Folded Reload +; CHECK-NEXT: ret entry: %i = select i1 %a, i64 0, i64 66296709418 %conv.i = trunc i64 %i to i32 @@ -20,14 +43,29 @@ if.end: ; preds = %if.then, %entry %i2 = sext i32 %i1 to i64 %call1.i = tail call i32 @test1(i64 %i2) ret i32 0 -; CHECK: // %if.end -; CHECK: mov w{{[0-9]+}}, w{{[0-9]+}} -; CHECK: bl test -; CHECK: mov w{{[0-9]+}}, w{{[0-9]+}} -; CHECK: bl test1 } define i32 @assertsext(i32 %n, i8 %a) local_unnamed_addr { +; CHECK-LABEL: assertsext: +; CHECK: // %bb.0: // %entry +; CHECK-NEXT: cbz w0, .LBB1_2 +; CHECK-NEXT: // %bb.1: +; CHECK-NEXT: mov x0, xzr +; CHECK-NEXT: b .LBB1_3 +; CHECK-NEXT: .LBB1_2: // %if.then +; CHECK-NEXT: mov x9, #24575 +; CHECK-NEXT: sxtb w8, w1 +; CHECK-NEXT: movk x9, #15873, lsl #16 +; CHECK-NEXT: movk x9, #474, lsl #32 +; CHECK-NEXT: udiv x0, x9, x8 +; CHECK-NEXT: .LBB1_3: // %if.end +; CHECK-NEXT: str x30, [sp, #-16]! // 8-byte Folded Spill +; CHECK-NEXT: .cfi_def_cfa_offset 16 +; CHECK-NEXT: .cfi_offset w30, -16 +; CHECK-NEXT: bl test1 +; CHECK-NEXT: mov w0, wzr +; CHECK-NEXT: ldr x30, [sp], #16 // 8-byte Folded Reload +; CHECK-NEXT: ret entry: %conv.i = sext i8 %a to i32 %cmp = icmp eq i32 %n, 0 @@ -37,9 +75,6 @@ if.then: ; preds = %entry %conv1 = zext i32 %conv.i to i64 %div = udiv i64 2036854775807, %conv1 br label %if.end -; CHECK: // %if.then -; CHECK: mov w{{[0-9]+}}, w{{[0-9]+}} -; CHECK: udiv x{{[0-9]+}}, x{{[0-9]+}}, x{{[0-9]+}} if.end: ; preds = %if.then, %entry %i1 = phi i64 [ %div, %if.then ], [ 0, %entry ] diff --git a/llvm/test/CodeGen/AArch64/redundant-mov-from-zero-extend.ll b/llvm/test/CodeGen/AArch64/redundant-mov-from-zero-extend.ll new file mode 100644 index 000000000000..42b9838acef2 --- /dev/null +++ b/llvm/test/CodeGen/AArch64/redundant-mov-from-zero-extend.ll @@ -0,0 +1,79 @@ +; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py +; RUN: llc -O3 -mtriple=aarch64-linux-gnu < %s | FileCheck %s + +define i32 @test(i32 %input, i32 %n, i32 %a) { +; CHECK-LABEL: test: +; CHECK: // %bb.0: // %entry +; CHECK-NEXT: cbz w1, .LBB0_2 +; CHECK-NEXT: // %bb.1: +; CHECK-NEXT: mov w0, wzr +; CHECK-NEXT: ret +; CHECK-NEXT: .LBB0_2: // %bb.0 +; CHECK-NEXT: add w8, w0, w1 +; CHECK-NEXT: mov w0, #100 +; CHECK-NEXT: cmp w8, #4 +; CHECK-NEXT: b.hi .LBB0_5 +; CHECK-NEXT: // %bb.3: // %bb.0 +; CHECK-NEXT: adrp x9, .LJTI0_0 +; CHECK-NEXT: add x9, x9, :lo12:.LJTI0_0 +; CHECK-NEXT: adr x10, .LBB0_4 +; CHECK-NEXT: ldrb w11, [x9, x8] +; CHECK-NEXT: add x10, x10, x11, lsl #2 +; CHECK-NEXT: br x10 +; CHECK-NEXT: .LBB0_4: // %sw.bb +; CHECK-NEXT: add w0, w2, #1 +; CHECK-NEXT: ret +; CHECK-NEXT: .LBB0_5: // %bb.0 +; CHECK-NEXT: cmp w8, #200 +; CHECK-NEXT: b.ne .LBB0_10 +; CHECK-NEXT: // %bb.6: // %sw.bb7 +; CHECK-NEXT: add w0, w2, #7 +; CHECK-NEXT: ret +; CHECK-NEXT: .LBB0_7: // %sw.bb1 +; CHECK-NEXT: add w0, w2, #3 +; CHECK-NEXT: ret +; CHECK-NEXT: .LBB0_8: // %sw.bb3 +; CHECK-NEXT: add w0, w2, #4 +; CHECK-NEXT: ret +; CHECK-NEXT: .LBB0_9: // %sw.bb5 +; CHECK-NEXT: add w0, w2, #5 +; CHECK-NEXT: .LBB0_10: // %return +; CHECK-NEXT: ret +entry: + %b = add nsw i32 %input, %n + %cmp = icmp eq i32 %n, 0 + br i1 %cmp, label %bb.0, label %return + +bb.0: + switch i32 %b, label %return [ + i32 0, label %sw.bb + i32 1, label %sw.bb1 + i32 2, label %sw.bb3 + i32 4, label %sw.bb5 + i32 200, label %sw.bb7 + ] + +sw.bb: + %add = add nsw i32 %a, 1 + br label %return + +sw.bb1: + %add2 = add nsw i32 %a, 3 + br label %return + +sw.bb3: + %add4 = add nsw i32 %a, 4 + br label %return + +sw.bb5: + %add6 = add nsw i32 %a, 5 + br label %return + +sw.bb7: + %add8 = add nsw i32 %a, 7 + br label %return + +return: + %retval.0 = phi i32 [ %add8, %sw.bb7 ], [ %add6, %sw.bb5 ], [ %add4, %sw.bb3 ], [ %add2, %sw.bb1 ], [ %add, %sw.bb ], [ 100, %bb.0 ], [ 0, %entry ] + ret i32 %retval.0 +} diff --git a/llvm/test/CodeGen/AArch64/redundant-orrwrs-from-zero-extend.mir b/llvm/test/CodeGen/AArch64/redundant-orrwrs-from-zero-extend.mir new file mode 100644 index 000000000000..37540dde048f --- /dev/null +++ b/llvm/test/CodeGen/AArch64/redundant-orrwrs-from-zero-extend.mir @@ -0,0 +1,69 @@ +# RUN: llc -mtriple=aarch64 -run-pass aarch64-mi-peephole-opt -verify-machineinstrs -o - %s | FileCheck %s +--- +name: test1 +# CHECK-LABEL: name: test1 +alignment: 4 +tracksRegLiveness: true +registers: + - { id: 0, class: gpr32 } + - { id: 1, class: gpr32 } + - { id: 2, class: gpr32 } + - { id: 3, class: gpr32 } + - { id: 4, class: gpr64 } +body: | + bb.0: + liveins: $w0, $w1 + + %0:gpr32 = COPY $w0 + %1:gpr32 = COPY $w1 + B %bb.1 + + bb.1: + %2:gpr32 = nsw ADDWrr %0, %1 + B %bb.2 + + bb.2: + ; CHECK-LABEL: bb.2: + ; CHECK-NOT: %3:gpr32 = ORRWrs $wzr, %2, 0 + ; The ORRWrs should be removed. + %3:gpr32 = ORRWrs $wzr, %2, 0 + %4:gpr64 = SUBREG_TO_REG 0, %3, %subreg.sub_32 + B %bb.3 + + bb.3: + $x0 = COPY %4 + RET_ReallyLR implicit $x0 +... +--- +name: test2 +# CHECK-LABEL: name: test2 +alignment: 4 +tracksRegLiveness: true +registers: + - { id: 0, class: gpr64 } + - { id: 1, class: gpr32 } + - { id: 2, class: gpr32 } + - { id: 3, class: gpr64 } +body: | + bb.0: + liveins: $x0 + + %0:gpr64 = COPY $x0 + B %bb.1 + + bb.1: + %1:gpr32 = EXTRACT_SUBREG %0, %subreg.sub_32 + B %bb.2 + + bb.2: + ; CHECK-LABEL: bb.2: + ; CHECK: %2:gpr32 = ORRWrs $wzr, %1, 0 + ; The ORRWrs should not be removed. + %2:gpr32 = ORRWrs $wzr, %1, 0 + %3:gpr64 = SUBREG_TO_REG 0, %2, %subreg.sub_32 + B %bb.3 + + bb.3: + $x0 = COPY %3 + RET_ReallyLR implicit $x0 +... </cut>

3 years, 8 months

[TCWG CI] 433.milc:[.] mult_su3_mat_vec slowed down by 11% after llvm: [AMDGPU] Enable load clustering in the post-RA scheduler

by ci_notify＠linaro.org

After llvm commit 66e13c7f439cf162d7ed1d25883e71a5755ac7ec Author: Jay Foad <jay.foad(a)amd.com> [AMDGPU] Enable load clustering in the post-RA scheduler the following hot functions slowed down by more than 10% (but their benchmarks slowed down by less than 2%): - 433.milc:[.] mult_su3_mat_vec slowed down by 11% from 2163 to 2391 perf samples Below reproducer instructions can be used to re-build both "first_bad" and "last_good" cross-toolchains used in this bisection. Naturally, the scripts will fail when triggerring benchmarking jobs if you don't have access to Linaro TCWG CI. For your convenience, we have uploaded tarballs with pre-processed source and assembly files at: - First_bad save-temps: https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_tx1-llvm-master-… - Last_good save-temps: https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_tx1-llvm-master-… - Baseline save-temps: https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_tx1-llvm-master-… Configuration: - Benchmark: SPEC CPU2006 - Toolchain: Clang + Glibc + LLVM Linker - Version: all components were built from their tip of trunk - Target: aarch64-linux-gnu - Compiler flags: -O2 - Hardware: NVidia TX1 4x Cortex-A57 This benchmarking CI is work-in-progress, and we welcome feedback and suggestions at linaro-toolchain(a)lists.linaro.org . In our improvement plans is to add support for SPEC CPU2017 benchmarks and provide "perf report/annotate" data behind these reports. THIS IS THE END OF INTERESTING STUFF. BELOW ARE LINKS TO BUILDS, REPRODUCTION INSTRUCTIONS, AND THE RAW COMMIT. This commit has regressed these CI configurations: - tcwg_bmk_llvm_tx1/llvm-master-aarch64-spec2k6-O2 First_bad build: https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_tx1-llvm-master-… Last_good build: https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_tx1-llvm-master-… Baseline build: https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_tx1-llvm-master-… Even more details: https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_tx1-llvm-master-… Reproduce builds: <cut> mkdir investigate-llvm-66e13c7f439cf162d7ed1d25883e71a5755ac7ec cd investigate-llvm-66e13c7f439cf162d7ed1d25883e71a5755ac7ec # Fetch scripts git clone https://git.linaro.org/toolchain/jenkins-scripts # Fetch manifests and test.sh script mkdir -p artifacts/manifests curl -o artifacts/manifests/build-baseline.sh https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_tx1-llvm-master-… --fail curl -o artifacts/manifests/build-parameters.sh https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_tx1-llvm-master-… --fail curl -o artifacts/test.sh https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_tx1-llvm-master-… --fail chmod +x artifacts/test.sh # Reproduce the baseline build (build all pre-requisites) ./jenkins-scripts/tcwg_bmk-build.sh @@ artifacts/manifests/build-baseline.sh # Save baseline build state (which is then restored in artifacts/test.sh) mkdir -p ./bisect rsync -a --del --delete-excluded --exclude /bisect/ --exclude /artifacts/ --exclude /llvm/ ./ ./bisect/baseline/ cd llvm # Reproduce first_bad build git checkout --detach 66e13c7f439cf162d7ed1d25883e71a5755ac7ec ../artifacts/test.sh # Reproduce last_good build git checkout --detach 838b4a533e6853d44e0c6d1977bcf0b06557d4ab ../artifacts/test.sh cd .. </cut> Full commit (up to 1000 lines): <cut> commit 66e13c7f439cf162d7ed1d25883e71a5755ac7ec Author: Jay Foad <jay.foad(a)amd.com> Date: Tue Oct 12 15:39:43 2021 +0100 [AMDGPU] Enable load clustering in the post-RA scheduler This has a couple of benefits: 1. It can sometimes fix clusters that got broken apart when the register allocator inserted a copy. 2. Post-RA scheduling does not have to worry about increasing register pressure, which in some cases gives it more freedom to reorder instructions. Testing on a collection of 10,000 graphics shaders compiled for gfx1010 showed: - The average length of each run of one or more load instructions increased by about 1%. - The number of runs of two or more load instructions increased by about 4%. --- llvm/lib/Target/AMDGPU/AMDGPUTargetMachine.cpp | 1 + llvm/test/CodeGen/AMDGPU/GlobalISel/extractelement.i128.ll | 5 ++--- llvm/test/CodeGen/AMDGPU/GlobalISel/udivrem.ll | 5 +++-- llvm/test/CodeGen/AMDGPU/amdgpu-codegenprepare-idiv.ll | 4 ++-- llvm/test/CodeGen/AMDGPU/idiv-licm.ll | 2 +- llvm/test/CodeGen/AMDGPU/promote-constOffset-to-imm.ll | 6 +++--- llvm/test/CodeGen/AMDGPU/sdiv64.ll | 2 +- llvm/test/CodeGen/AMDGPU/srem64.ll | 2 +- llvm/test/CodeGen/AMDGPU/udiv64.ll | 2 +- llvm/test/CodeGen/AMDGPU/urem64.ll | 2 +- 10 files changed, 16 insertions(+), 15 deletions(-) diff --git a/llvm/lib/Target/AMDGPU/AMDGPUTargetMachine.cpp b/llvm/lib/Target/AMDGPU/AMDGPUTargetMachine.cpp index b0902465c592..7b2d56e88b5f 100644 --- a/llvm/lib/Target/AMDGPU/AMDGPUTargetMachine.cpp +++ b/llvm/lib/Target/AMDGPU/AMDGPUTargetMachine.cpp @@ -825,6 +825,7 @@ public: createPostMachineScheduler(MachineSchedContext *C) const override { ScheduleDAGMI *DAG = createGenericSchedPostRA(C); const GCNSubtarget &ST = C->MF->getSubtarget<GCNSubtarget>(); + DAG->addMutation(createLoadClusterDAGMutation(DAG->TII, DAG->TRI)); DAG->addMutation(ST.createFillMFMAShadowMutation(DAG->TII)); return DAG; } diff --git a/llvm/test/CodeGen/AMDGPU/GlobalISel/extractelement.i128.ll b/llvm/test/CodeGen/AMDGPU/GlobalISel/extractelement.i128.ll index fa500054e058..804dea705011 100644 --- a/llvm/test/CodeGen/AMDGPU/GlobalISel/extractelement.i128.ll +++ b/llvm/test/CodeGen/AMDGPU/GlobalISel/extractelement.i128.ll @@ -185,21 +185,20 @@ define i128 @extractelement_vgpr_v4i128_vgpr_idx(<4 x i128> addrspace(1)* %ptr, ; GFX8-NEXT: s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0) ; GFX8-NEXT: v_add_u32_e32 v3, vcc, 16, v0 ; GFX8-NEXT: v_addc_u32_e32 v4, vcc, 0, v1, vcc -; GFX8-NEXT: flat_load_dwordx4 v[8:11], v[0:1] ; GFX8-NEXT: flat_load_dwordx4 v[4:7], v[3:4] +; GFX8-NEXT: flat_load_dwordx4 v[8:11], v[0:1] ; GFX8-NEXT: v_lshlrev_b32_e32 v16, 1, v2 ; GFX8-NEXT: v_add_u32_e32 v17, vcc, 1, v16 ; GFX8-NEXT: v_cmp_eq_u32_e32 vcc, 1, v17 ; GFX8-NEXT: v_cmp_eq_u32_e64 s[4:5], 1, v16 ; GFX8-NEXT: v_cmp_eq_u32_e64 s[6:7], 6, v16 ; GFX8-NEXT: v_cmp_eq_u32_e64 s[8:9], 7, v16 -; GFX8-NEXT: s_waitcnt vmcnt(1) +; GFX8-NEXT: s_waitcnt vmcnt(0) ; GFX8-NEXT: v_cndmask_b32_e64 v2, v8, v10, s[4:5] ; GFX8-NEXT: v_cndmask_b32_e64 v3, v9, v11, s[4:5] ; GFX8-NEXT: v_cndmask_b32_e32 v8, v8, v10, vcc ; GFX8-NEXT: v_cndmask_b32_e32 v9, v9, v11, vcc ; GFX8-NEXT: v_cmp_eq_u32_e32 vcc, 2, v16 -; GFX8-NEXT: s_waitcnt vmcnt(0) ; GFX8-NEXT: v_cndmask_b32_e32 v2, v2, v4, vcc ; GFX8-NEXT: v_cndmask_b32_e32 v3, v3, v5, vcc ; GFX8-NEXT: v_cmp_eq_u32_e32 vcc, 2, v17 diff --git a/llvm/test/CodeGen/AMDGPU/GlobalISel/udivrem.ll b/llvm/test/CodeGen/AMDGPU/GlobalISel/udivrem.ll index 133a224b7437..bd4ecd3a17e5 100644 --- a/llvm/test/CodeGen/AMDGPU/GlobalISel/udivrem.ll +++ b/llvm/test/CodeGen/AMDGPU/GlobalISel/udivrem.ll @@ -830,8 +830,8 @@ define amdgpu_kernel void @udivrem_v4i32(<4 x i32> addrspace(1)* %out0, <4 x i32 ; GFX9-LABEL: udivrem_v4i32: ; GFX9: ; %bb.0: ; GFX9-NEXT: s_load_dwordx4 s[0:3], s[4:5], 0x20 -; GFX9-NEXT: v_mov_b32_e32 v2, 0x4f7ffffe ; GFX9-NEXT: s_load_dwordx4 s[8:11], s[4:5], 0x10 +; GFX9-NEXT: v_mov_b32_e32 v2, 0x4f7ffffe ; GFX9-NEXT: s_waitcnt lgkmcnt(0) ; GFX9-NEXT: v_cvt_f32_u32_e32 v0, s0 ; GFX9-NEXT: v_cvt_f32_u32_e32 v1, s1 @@ -926,9 +926,10 @@ define amdgpu_kernel void @udivrem_v4i32(<4 x i32> addrspace(1)* %out0, <4 x i32 ; ; GFX10-LABEL: udivrem_v4i32: ; GFX10: ; %bb.0: +; GFX10-NEXT: s_clause 0x1 ; GFX10-NEXT: s_load_dwordx4 s[8:11], s[4:5], 0x20 -; GFX10-NEXT: v_mov_b32_e32 v4, 0x4f7ffffe ; GFX10-NEXT: s_load_dwordx4 s[0:3], s[4:5], 0x10 +; GFX10-NEXT: v_mov_b32_e32 v4, 0x4f7ffffe ; GFX10-NEXT: v_mov_b32_e32 v8, 0 ; GFX10-NEXT: s_waitcnt lgkmcnt(0) ; GFX10-NEXT: v_cvt_f32_u32_e32 v0, s8 diff --git a/llvm/test/CodeGen/AMDGPU/amdgpu-codegenprepare-idiv.ll b/llvm/test/CodeGen/AMDGPU/amdgpu-codegenprepare-idiv.ll index b033497d3aed..81b055166dd2 100644 --- a/llvm/test/CodeGen/AMDGPU/amdgpu-codegenprepare-idiv.ll +++ b/llvm/test/CodeGen/AMDGPU/amdgpu-codegenprepare-idiv.ll @@ -11236,8 +11236,8 @@ define amdgpu_kernel void @sdiv_i64_pow2_shl_denom(i64 addrspace(1)* %out, i64 % ; GFX6-LABEL: sdiv_i64_pow2_shl_denom: ; GFX6: ; %bb.0: ; GFX6-NEXT: s_load_dword s4, s[0:1], 0xd -; GFX6-NEXT: s_mov_b64 s[2:3], 0x1000 ; GFX6-NEXT: s_load_dwordx4 s[8:11], s[0:1], 0x9 +; GFX6-NEXT: s_mov_b64 s[2:3], 0x1000 ; GFX6-NEXT: s_mov_b32 s7, 0xf000 ; GFX6-NEXT: s_mov_b32 s6, -1 ; GFX6-NEXT: s_waitcnt lgkmcnt(0) @@ -13358,8 +13358,8 @@ define amdgpu_kernel void @srem_i64_pow2_shl_denom(i64 addrspace(1)* %out, i64 % ; GFX6-LABEL: srem_i64_pow2_shl_denom: ; GFX6: ; %bb.0: ; GFX6-NEXT: s_load_dword s4, s[0:1], 0xd -; GFX6-NEXT: s_mov_b64 s[2:3], 0x1000 ; GFX6-NEXT: s_load_dwordx4 s[8:11], s[0:1], 0x9 +; GFX6-NEXT: s_mov_b64 s[2:3], 0x1000 ; GFX6-NEXT: s_mov_b32 s7, 0xf000 ; GFX6-NEXT: s_mov_b32 s6, -1 ; GFX6-NEXT: s_waitcnt lgkmcnt(0) diff --git a/llvm/test/CodeGen/AMDGPU/idiv-licm.ll b/llvm/test/CodeGen/AMDGPU/idiv-licm.ll index fb9348bae000..9ea8f101b5e9 100644 --- a/llvm/test/CodeGen/AMDGPU/idiv-licm.ll +++ b/llvm/test/CodeGen/AMDGPU/idiv-licm.ll @@ -491,8 +491,8 @@ define amdgpu_kernel void @urem16_invariant_denom(i16 addrspace(1)* nocapture %a ; GFX9-LABEL: urem16_invariant_denom: ; GFX9: ; %bb.0: ; %bb ; GFX9-NEXT: s_load_dword s2, s[0:1], 0x2c -; GFX9-NEXT: s_mov_b32 s6, 0xffff ; GFX9-NEXT: s_load_dwordx2 s[4:5], s[0:1], 0x24 +; GFX9-NEXT: s_mov_b32 s6, 0xffff ; GFX9-NEXT: v_mov_b32_e32 v1, 0 ; GFX9-NEXT: s_movk_i32 s8, 0x400 ; GFX9-NEXT: s_waitcnt lgkmcnt(0) diff --git a/llvm/test/CodeGen/AMDGPU/promote-constOffset-to-imm.ll b/llvm/test/CodeGen/AMDGPU/promote-constOffset-to-imm.ll index e2fbc0bc4af9..ba093ad3771d 100644 --- a/llvm/test/CodeGen/AMDGPU/promote-constOffset-to-imm.ll +++ b/llvm/test/CodeGen/AMDGPU/promote-constOffset-to-imm.ll @@ -100,14 +100,14 @@ define hidden amdgpu_kernel void @clmem_read(i8 addrspace(1)* %buffer) { ; GFX900: global_load_dwordx2 v[{{[0-9]+:[0-9]+}}], v[{{[0-9]+:[0-9]+}}], off{{$}} ; ; GFX10: global_load_dwordx2 v[{{[0-9]+:[0-9]+}}], v[{{[0-9]+:[0-9]+}}], off offset:-2048 -; GFX10: global_load_dwordx2 v[{{[0-9]+:[0-9]+}}], v[{{[0-9]+:[0-9]+}}], off{{$}} ; GFX10: global_load_dwordx2 v[{{[0-9]+:[0-9]+}}], v[{{[0-9]+:[0-9]+}}], off offset:-2048 -; GFX10: global_load_dwordx2 v[{{[0-9]+:[0-9]+}}], v[{{[0-9]+:[0-9]+}}], off{{$}} ; GFX10: global_load_dwordx2 v[{{[0-9]+:[0-9]+}}], v[{{[0-9]+:[0-9]+}}], off offset:-2048 -; GFX10: global_load_dwordx2 v[{{[0-9]+:[0-9]+}}], v[{{[0-9]+:[0-9]+}}], off{{$}} ; GFX10: global_load_dwordx2 v[{{[0-9]+:[0-9]+}}], v[{{[0-9]+:[0-9]+}}], off offset:-2048 ; GFX10: global_load_dwordx2 v[{{[0-9]+:[0-9]+}}], v[{{[0-9]+:[0-9]+}}], off{{$}} ; GFX10: global_load_dwordx2 v[{{[0-9]+:[0-9]+}}], v[{{[0-9]+:[0-9]+}}], off{{$}} +; GFX10: global_load_dwordx2 v[{{[0-9]+:[0-9]+}}], v[{{[0-9]+:[0-9]+}}], off{{$}} +; GFX10: global_load_dwordx2 v[{{[0-9]+:[0-9]+}}], v[{{[0-9]+:[0-9]+}}], off{{$}} +; GFX10: global_load_dwordx2 v[{{[0-9]+:[0-9]+}}], v[{{[0-9]+:[0-9]+}}], off{{$}} ; GFX10: global_load_dwordx2 v[{{[0-9]+:[0-9]+}}], v[{{[0-9]+:[0-9]+}}], off offset:-2048 ; GFX10: global_load_dwordx2 v[{{[0-9]+:[0-9]+}}], v[{{[0-9]+:[0-9]+}}], off{{$}} diff --git a/llvm/test/CodeGen/AMDGPU/sdiv64.ll b/llvm/test/CodeGen/AMDGPU/sdiv64.ll index 0b80b4170316..dbb6d4805495 100644 --- a/llvm/test/CodeGen/AMDGPU/sdiv64.ll +++ b/llvm/test/CodeGen/AMDGPU/sdiv64.ll @@ -6,8 +6,8 @@ define amdgpu_kernel void @s_test_sdiv(i64 addrspace(1)* %out, i64 %x, i64 %y) { ; GCN-LABEL: s_test_sdiv: ; GCN: ; %bb.0: ; GCN-NEXT: s_load_dwordx2 s[4:5], s[0:1], 0xd -; GCN-NEXT: v_mov_b32_e32 v7, 0 ; GCN-NEXT: s_load_dwordx4 s[8:11], s[0:1], 0x9 +; GCN-NEXT: v_mov_b32_e32 v7, 0 ; GCN-NEXT: s_mov_b32 s7, 0xf000 ; GCN-NEXT: s_mov_b32 s6, -1 ; GCN-NEXT: s_waitcnt lgkmcnt(0) diff --git a/llvm/test/CodeGen/AMDGPU/srem64.ll b/llvm/test/CodeGen/AMDGPU/srem64.ll index fac510e8dbda..04f8ea10545e 100644 --- a/llvm/test/CodeGen/AMDGPU/srem64.ll +++ b/llvm/test/CodeGen/AMDGPU/srem64.ll @@ -6,8 +6,8 @@ define amdgpu_kernel void @s_test_srem(i64 addrspace(1)* %out, i64 %x, i64 %y) { ; GCN-LABEL: s_test_srem: ; GCN: ; %bb.0: ; GCN-NEXT: s_load_dwordx2 s[12:13], s[0:1], 0xd -; GCN-NEXT: v_mov_b32_e32 v2, 0 ; GCN-NEXT: s_load_dwordx4 s[8:11], s[0:1], 0x9 +; GCN-NEXT: v_mov_b32_e32 v2, 0 ; GCN-NEXT: s_mov_b32 s7, 0xf000 ; GCN-NEXT: s_mov_b32 s6, -1 ; GCN-NEXT: s_waitcnt lgkmcnt(0) diff --git a/llvm/test/CodeGen/AMDGPU/udiv64.ll b/llvm/test/CodeGen/AMDGPU/udiv64.ll index cc829b8e7eb3..48a86eec9832 100644 --- a/llvm/test/CodeGen/AMDGPU/udiv64.ll +++ b/llvm/test/CodeGen/AMDGPU/udiv64.ll @@ -6,8 +6,8 @@ define amdgpu_kernel void @s_test_udiv_i64(i64 addrspace(1)* %out, i64 %x, i64 % ; GCN-LABEL: s_test_udiv_i64: ; GCN: ; %bb.0: ; GCN-NEXT: s_load_dwordx2 s[2:3], s[0:1], 0xd -; GCN-NEXT: v_mov_b32_e32 v2, 0 ; GCN-NEXT: s_load_dwordx4 s[8:11], s[0:1], 0x9 +; GCN-NEXT: v_mov_b32_e32 v2, 0 ; GCN-NEXT: s_mov_b32 s7, 0xf000 ; GCN-NEXT: s_mov_b32 s6, -1 ; GCN-NEXT: s_waitcnt lgkmcnt(0) diff --git a/llvm/test/CodeGen/AMDGPU/urem64.ll b/llvm/test/CodeGen/AMDGPU/urem64.ll index a0a4b73262a7..296aaf2ed1c6 100644 --- a/llvm/test/CodeGen/AMDGPU/urem64.ll +++ b/llvm/test/CodeGen/AMDGPU/urem64.ll @@ -6,8 +6,8 @@ define amdgpu_kernel void @s_test_urem_i64(i64 addrspace(1)* %out, i64 %x, i64 % ; GCN-LABEL: s_test_urem_i64: ; GCN: ; %bb.0: ; GCN-NEXT: s_load_dwordx2 s[12:13], s[0:1], 0xd -; GCN-NEXT: v_mov_b32_e32 v2, 0 ; GCN-NEXT: s_load_dwordx4 s[8:11], s[0:1], 0x9 +; GCN-NEXT: v_mov_b32_e32 v2, 0 ; GCN-NEXT: s_mov_b32 s7, 0xf000 ; GCN-NEXT: s_mov_b32 s6, -1 ; GCN-NEXT: s_waitcnt lgkmcnt(0) </cut>

3 years, 8 months

[ACTIVITY] 18 - 22 Oct 2021

by Prathamesh Kulkarni

== This Week == * GCC - Committed a clean up patch to gimple-isel - PR93183: Committed fix - PR102376: Patch approved upstream - PR83750: Patch approved upstream but it regresses one test-case. == Next Week == - Continue with ongoing tasks

3 years, 8 months

[TCWG CI] 444.namd grew in size by 2% after llvm: [SLP]Improve graph reordering.

by ci_notify＠linaro.org

After llvm commit bc69dd62c04a70d29943c1c06c7effed150b70e1 Author: Alexey Bataev <a.bataev(a)outlook.com> [SLP]Improve graph reordering. the following benchmarks grew in size by more than 1%: - 444.namd grew in size by 2% from 192302 to 195218 bytes Below reproducer instructions can be used to re-build both "first_bad" and "last_good" cross-toolchains used in this bisection. Naturally, the scripts will fail when triggerring benchmarking jobs if you don't have access to Linaro TCWG CI. For your convenience, we have uploaded tarballs with pre-processed source and assembly files at: - First_bad save-temps: https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_apm-llvm-master-… - Last_good save-temps: https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_apm-llvm-master-… - Baseline save-temps: https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_apm-llvm-master-… Configuration: - Benchmark: SPEC CPU2006 - Toolchain: Clang + Glibc + LLVM Linker - Version: all components were built from their tip of trunk - Target: aarch64-linux-gnu - Compiler flags: -Os - Hardware: APM Mustang 8x X-Gene1 This benchmarking CI is work-in-progress, and we welcome feedback and suggestions at linaro-toolchain(a)lists.linaro.org . In our improvement plans is to add support for SPEC CPU2017 benchmarks and provide "perf report/annotate" data behind these reports. THIS IS THE END OF INTERESTING STUFF. BELOW ARE LINKS TO BUILDS, REPRODUCTION INSTRUCTIONS, AND THE RAW COMMIT. This commit has regressed these CI configurations: - tcwg_bmk_llvm_apm/llvm-master-aarch64-spec2k6-Os First_bad build: https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_apm-llvm-master-… Last_good build: https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_apm-llvm-master-… Baseline build: https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_apm-llvm-master-… Even more details: https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_apm-llvm-master-… Reproduce builds: <cut> mkdir investigate-llvm-bc69dd62c04a70d29943c1c06c7effed150b70e1 cd investigate-llvm-bc69dd62c04a70d29943c1c06c7effed150b70e1 # Fetch scripts git clone https://git.linaro.org/toolchain/jenkins-scripts # Fetch manifests and test.sh script mkdir -p artifacts/manifests curl -o artifacts/manifests/build-baseline.sh https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_apm-llvm-master-… --fail curl -o artifacts/manifests/build-parameters.sh https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_apm-llvm-master-… --fail curl -o artifacts/test.sh https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_apm-llvm-master-… --fail chmod +x artifacts/test.sh # Reproduce the baseline build (build all pre-requisites) ./jenkins-scripts/tcwg_bmk-build.sh @@ artifacts/manifests/build-baseline.sh # Save baseline build state (which is then restored in artifacts/test.sh) mkdir -p ./bisect rsync -a --del --delete-excluded --exclude /bisect/ --exclude /artifacts/ --exclude /llvm/ ./ ./bisect/baseline/ cd llvm # Reproduce first_bad build git checkout --detach bc69dd62c04a70d29943c1c06c7effed150b70e1 ../artifacts/test.sh # Reproduce last_good build git checkout --detach 5661317f864abf750cf893c6a4cc7a977be0995a ../artifacts/test.sh cd .. </cut> Full commit (up to 1000 lines): <cut> commit bc69dd62c04a70d29943c1c06c7effed150b70e1 Author: Alexey Bataev <a.bataev(a)outlook.com> Date: Tue Aug 3 13:20:32 2021 -0700 [SLP]Improve graph reordering. Reworked reordering algorithm. Originally, the compiler just tried to detect the most common order in the reordarable nodes (loads, stores, extractelements,extractvalues) and then fully rebuilding the graph in the best order. This was not effecient, since it required an extra memory and time for building/rebuilding tree, double the use of the scheduling budget, which could lead to missing vectorization due to exausted scheduling resources. Patch provide 2-way approach for graph reodering problem. At first, all reordering is done in-place, it doe not required tree deleting/rebuilding, it just rotates the scalars/orders/reuses masks in the graph node. The first step (top-to bottom) rotates the whole graph, similarly to the previous implementation. Compiler counts the number of the most used orders of the graph nodes with the same vectorization factor and then rotates the subgraph with the given vectorization factor to the most used order, if it is not empty. Then repeats the same procedure for the subgraphs with the smaller vectorization factor. We can do this because we still need to reshuffle smaller subgraph when buildiong operands for the graph nodes with lasrger vectorization factor, we can rotate just subgraph, not the whole graph. The second step (bottom-to-top) scans through the leaves and tries to detect the users of the leaves which can be reordered. If the leaves can be reorder in the best fashion, they are reordered and their user too. It allows to remove double shuffles to the same ordering of the operands in many cases and just reorder the user operations instead. Plus, it moves the final shuffles closer to the top of the graph and in many cases allows to remove extra shuffle because the same procedure is repeated again and we can again merge some reordering masks and reorder user nodes instead of the operands. Also, patch improves cost model for gathering of loads, which improves x264 benchmark in some cases. Gives about +2% on AVX512 + LTO (more expected for AVX/AVX2) for {625,525}x264, +3% for 508.namd, improves most of other benchmarks. The compile and link time are almost the same, though in some cases it should be better (we're not doing an extra instruction scheduling anymore) + we may vectorize more code for the large basic blocks again because of saving scheduling budget. Differential Revision: https://reviews.llvm.org/D105020 --- .../llvm/Transforms/Vectorize/SLPVectorizer.h | 3 +- llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp | 1364 ++++++++++++++------ .../AArch64/transpose-inseltpoison.ll | 84 +- .../Transforms/SLPVectorizer/AArch64/transpose.ll | 84 +- llvm/test/Transforms/SLPVectorizer/X86/addsub.ll | 42 +- .../Transforms/SLPVectorizer/X86/crash_cmpop.ll | 6 +- llvm/test/Transforms/SLPVectorizer/X86/extract.ll | 6 +- .../SLPVectorizer/X86/jumbled-load-multiuse.ll | 12 +- .../Transforms/SLPVectorizer/X86/jumbled-load.ll | 22 +- .../SLPVectorizer/X86/jumbled_store_crash.ll | 29 +- .../SLPVectorizer/X86/reorder_repeated_ops.ll | 4 +- .../SLPVectorizer/X86/split-load8_2-unord.ll | 4 +- .../X86/vectorize-reorder-alt-shuffle.ll | 9 +- .../SLPVectorizer/X86/vectorize-reorder-reuse.ll | 52 +- 14 files changed, 1119 insertions(+), 602 deletions(-) diff --git a/llvm/include/llvm/Transforms/Vectorize/SLPVectorizer.h b/llvm/include/llvm/Transforms/Vectorize/SLPVectorizer.h index f416a592d683..5e8c29913cad 100644 --- a/llvm/include/llvm/Transforms/Vectorize/SLPVectorizer.h +++ b/llvm/include/llvm/Transforms/Vectorize/SLPVectorizer.h @@ -95,8 +95,7 @@ private: /// Try to vectorize a list of operands. /// \returns true if a value was vectorized. - bool tryToVectorizeList(ArrayRef<Value *> VL, slpvectorizer::BoUpSLP &R, - bool AllowReorder = false); + bool tryToVectorizeList(ArrayRef<Value *> VL, slpvectorizer::BoUpSLP &R); /// Try to vectorize a chain that may start at the operands of \p I. bool tryToVectorize(Instruction *I, slpvectorizer::BoUpSLP &R); diff --git a/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp b/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp index 9c0029484964..7400b3d8a503 100644 --- a/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp +++ b/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp @@ -21,6 +21,7 @@ #include "llvm/ADT/DenseSet.h" #include "llvm/ADT/Optional.h" #include "llvm/ADT/PostOrderIterator.h" +#include "llvm/ADT/PriorityQueue.h" #include "llvm/ADT/STLExtras.h" #include "llvm/ADT/SetOperations.h" #include "llvm/ADT/SetVector.h" @@ -535,13 +536,68 @@ static bool isSimple(Instruction *I) { return true; } +/// Shuffles \p Mask in accordance with the given \p SubMask. +static void addMask(SmallVectorImpl<int> &Mask, ArrayRef<int> SubMask) { + if (SubMask.empty()) + return; + if (Mask.empty()) { + Mask.append(SubMask.begin(), SubMask.end()); + return; + } + SmallVector<int> NewMask(SubMask.size(), UndefMaskElem); + int TermValue = std::min(Mask.size(), SubMask.size()); + for (int I = 0, E = SubMask.size(); I < E; ++I) { + if (SubMask[I] >= TermValue || SubMask[I] == UndefMaskElem || + Mask[SubMask[I]] >= TermValue) + continue; + NewMask[I] = Mask[SubMask[I]]; + } + Mask.swap(NewMask); +} + +/// Order may have elements assigned special value (size) which is out of +/// bounds. Such indices only appear on places which correspond to undef values +/// (see canReuseExtract for details) and used in order to avoid undef values +/// have effect on operands ordering. +/// The first loop below simply finds all unused indices and then the next loop +/// nest assigns these indices for undef values positions. +/// As an example below Order has two undef positions and they have assigned +/// values 3 and 7 respectively: +/// before: 6 9 5 4 9 2 1 0 +/// after: 6 3 5 4 7 2 1 0 +/// \returns Fixed ordering. +static void fixupOrderingIndices(SmallVectorImpl<unsigned> &Order) { + const unsigned Sz = Order.size(); + SmallBitVector UsedIndices(Sz); + SmallVector<int> MaskedIndices; + for (unsigned I = 0; I < Sz; ++I) { + if (Order[I] < Sz) + UsedIndices.set(Order[I]); + else + MaskedIndices.push_back(I); + } + if (MaskedIndices.empty()) + return; + SmallVector<int> AvailableIndices(MaskedIndices.size()); + unsigned Cnt = 0; + int Idx = UsedIndices.find_first(); + do { + AvailableIndices[Cnt] = Idx; + Idx = UsedIndices.find_next(Idx); + ++Cnt; + } while (Idx > 0); + assert(Cnt == MaskedIndices.size() && "Non-synced masked/available indices."); + for (int I = 0, E = MaskedIndices.size(); I < E; ++I) + Order[MaskedIndices[I]] = AvailableIndices[I]; +} + namespace llvm { static void inversePermutation(ArrayRef<unsigned> Indices, SmallVectorImpl<int> &Mask) { Mask.clear(); const unsigned E = Indices.size(); - Mask.resize(E, E + 1); + Mask.resize(E, UndefMaskElem); for (unsigned I = 0; I < E; ++I) Mask[Indices[I]] = I; } @@ -581,6 +637,22 @@ static Optional<int> getInsertIndex(Value *InsertInst, unsigned Offset) { return Index; } +/// Reorders the list of scalars in accordance with the given \p Order and then +/// the \p Mask. \p Order - is the original order of the scalars, need to +/// reorder scalars into an unordered state at first according to the given +/// order. Then the ordered scalars are shuffled once again in accordance with +/// the provided mask. +static void reorderScalars(SmallVectorImpl<Value *> &Scalars, + ArrayRef<int> Mask) { + assert(!Mask.empty() && "Expected non-empty mask."); + SmallVector<Value *> Prev(Scalars.size(), + UndefValue::get(Scalars.front()->getType())); + Prev.swap(Scalars); + for (unsigned I = 0, E = Prev.size(); I < E; ++I) + if (Mask[I] != UndefMaskElem) + Scalars[Mask[I]] = Prev[I]; +} + namespace slpvectorizer { /// Bottom Up SLP Vectorizer. @@ -645,13 +717,12 @@ public: void buildTree(ArrayRef<Value *> Roots, ArrayRef<Value *> UserIgnoreLst = None); - /// Construct a vectorizable tree that starts at \p Roots, ignoring users for - /// the purpose of scheduling and extraction in the \p UserIgnoreLst taking - /// into account (and updating it, if required) list of externally used - /// values stored in \p ExternallyUsedValues. - void buildTree(ArrayRef<Value *> Roots, - ExtraValueToDebugLocsMap &ExternallyUsedValues, - ArrayRef<Value *> UserIgnoreLst = None); + /// Builds external uses of the vectorized scalars, i.e. the list of + /// vectorized scalars to be extracted, their lanes and their scalar users. \p + /// ExternallyUsedValues contains additional list of external uses to handle + /// vectorization of reductions. + void + buildExternalUses(const ExtraValueToDebugLocsMap &ExternallyUsedValues = {}); /// Clear the internal data structures that are created by 'buildTree'. void deleteTree() { @@ -659,8 +730,6 @@ public: ScalarToTreeEntry.clear(); MustGather.clear(); ExternalUses.clear(); - NumOpsWantToKeepOrder.clear(); - NumOpsWantToKeepOriginalOrder = 0; for (auto &Iter : BlocksSchedules) { BlockScheduling *BS = Iter.second.get(); BS->clear(); @@ -674,103 +743,22 @@ public: /// Perform LICM and CSE on the newly generated gather sequences. void optimizeGatherSequence(); - /// \returns The best order of instructions for vectorization. - Optional<ArrayRef<unsigned>> bestOrder() const { - assert(llvm::all_of( - NumOpsWantToKeepOrder, - [this](const decltype(NumOpsWantToKeepOrder)::value_type &D) { - return D.getFirst().size() == - VectorizableTree[0]->Scalars.size(); - }) && - "All orders must have the same size as number of instructions in " - "tree node."); - auto I = std::max_element( - NumOpsWantToKeepOrder.begin(), NumOpsWantToKeepOrder.end(), - [](const decltype(NumOpsWantToKeepOrder)::value_type &D1, - const decltype(NumOpsWantToKeepOrder)::value_type &D2) { - return D1.second < D2.second; - }); - if (I == NumOpsWantToKeepOrder.end() || - I->getSecond() <= NumOpsWantToKeepOriginalOrder) - return None; - - return makeArrayRef(I->getFirst()); - } - - /// Builds the correct order for root instructions. - /// If some leaves have the same instructions to be vectorized, we may - /// incorrectly evaluate the best order for the root node (it is built for the - /// vector of instructions without repeated instructions and, thus, has less - /// elements than the root node). This function builds the correct order for - /// the root node. - /// For example, if the root node is \<a+b, a+c, a+d, f+e\>, then the leaves - /// are \<a, a, a, f\> and \<b, c, d, e\>. When we try to vectorize the first - /// leaf, it will be shrink to \<a, b\>. If instructions in this leaf should - /// be reordered, the best order will be \<1, 0\>. We need to extend this - /// order for the root node. For the root node this order should look like - /// \<3, 0, 1, 2\>. This function extends the order for the reused - /// instructions. - void findRootOrder(OrdersType &Order) { - // If the leaf has the same number of instructions to vectorize as the root - // - order must be set already. - unsigned RootSize = VectorizableTree[0]->Scalars.size(); - if (Order.size() == RootSize) - return; - SmallVector<unsigned, 4> RealOrder(Order.size()); - std::swap(Order, RealOrder); - SmallVector<int, 4> Mask; - inversePermutation(RealOrder, Mask); - Order.assign(Mask.begin(), Mask.end()); - // The leaf has less number of instructions - need to find the true order of - // the root. - // Scan the nodes starting from the leaf back to the root. - const TreeEntry *PNode = VectorizableTree.back().get(); - SmallVector<const TreeEntry *, 4> Nodes(1, PNode); - SmallPtrSet<const TreeEntry *, 4> Visited; - while (!Nodes.empty() && Order.size() != RootSize) { - const TreeEntry *PNode = Nodes.pop_back_val(); - if (!Visited.insert(PNode).second) - continue; - const TreeEntry &Node = *PNode; - for (const EdgeInfo &EI : Node.UserTreeIndices) - if (EI.UserTE) - Nodes.push_back(EI.UserTE); - if (Node.ReuseShuffleIndices.empty()) - continue; - // Build the order for the parent node. - OrdersType NewOrder(Node.ReuseShuffleIndices.size(), RootSize); - SmallVector<unsigned, 4> OrderCounter(Order.size(), 0); - // The algorithm of the order extension is: - // 1. Calculate the number of the same instructions for the order. - // 2. Calculate the index of the new order: total number of instructions - // with order less than the order of the current instruction + reuse - // number of the current instruction. - // 3. The new order is just the index of the instruction in the original - // vector of the instructions. - for (unsigned I : Node.ReuseShuffleIndices) - ++OrderCounter[Order[I]]; - SmallVector<unsigned, 4> CurrentCounter(Order.size(), 0); - for (unsigned I = 0, E = Node.ReuseShuffleIndices.size(); I < E; ++I) { - unsigned ReusedIdx = Node.ReuseShuffleIndices[I]; - unsigned OrderIdx = Order[ReusedIdx]; - unsigned NewIdx = 0; - for (unsigned J = 0; J < OrderIdx; ++J) - NewIdx += OrderCounter[J]; - NewIdx += CurrentCounter[OrderIdx]; - ++CurrentCounter[OrderIdx]; - assert(NewOrder[NewIdx] == RootSize && - "The order index should not be written already."); - NewOrder[NewIdx] = I; - } - std::swap(Order, NewOrder); - } - assert(Order.size() == RootSize && - "Root node is expected or the size of the order must be the same as " - "the number of elements in the root node."); - assert(llvm::all_of(Order, - [RootSize](unsigned Val) { return Val != RootSize; }) && - "All indices must be initialized"); - } + /// Reorders the current graph to the most profitable order starting from the + /// root node to the leaf nodes. The best order is chosen only from the nodes + /// of the same size (vectorization factor). Smaller nodes are considered + /// parts of subgraph with smaller VF and they are reordered independently. We + /// can make it because we still need to extend smaller nodes to the wider VF + /// and we can merge reordering shuffles with the widening shuffles. + void reorderTopToBottom(); + + /// Reorders the current graph to the most profitable order starting from + /// leaves to the root. It allows to rotate small subgraphs and reduce the + /// number of reshuffles if the leaf nodes use the same order. In this case we + /// can merge the orders and just shuffle user node instead of shuffling its + /// operands. Plus, even the leaf nodes have different orders, it allows to + /// sink reordering in the graph closer to the root node and merge it later + /// during analysis. + void reorderBottomToTop(); /// \return The vector element size in bits to use when vectorizing the /// expression tree ending at \p V. If V is a store, the size is the width of @@ -793,6 +781,10 @@ public: return MinVecRegSize; } + unsigned getMinVF(unsigned Sz) const { + return std::max(2U, getMinVecRegSize() / Sz); + } + unsigned getMaximumVF(unsigned ElemWidth, unsigned Opcode) const { unsigned MaxVF = MaxVFOption.getNumOccurrences() ? MaxVFOption : TTI->getMaximumVF(ElemWidth, Opcode); @@ -1621,12 +1613,29 @@ private: /// \returns true if the scalars in VL are equal to this entry. bool isSame(ArrayRef<Value *> VL) const { - if (VL.size() == Scalars.size()) - return std::equal(VL.begin(), VL.end(), Scalars.begin()); - return VL.size() == ReuseShuffleIndices.size() && - std::equal( - VL.begin(), VL.end(), ReuseShuffleIndices.begin(), - [this](Value *V, int Idx) { return V == Scalars[Idx]; }); + auto &&IsSame = [VL](ArrayRef<Value *> Scalars, ArrayRef<int> Mask) { + if (Mask.size() != VL.size() && VL.size() == Scalars.size()) + return std::equal(VL.begin(), VL.end(), Scalars.begin()); + return VL.size() == Mask.size() && + std::equal( + VL.begin(), VL.end(), Mask.begin(), + [Scalars](Value *V, int Idx) { return V == Scalars[Idx]; }); + }; + if (!ReorderIndices.empty()) { + // TODO: implement matching if the nodes are just reordered, still can + // treat the vector as the same if the list of scalars matches VL + // directly, without reordering. + SmallVector<int> Mask; + inversePermutation(ReorderIndices, Mask); + if (VL.size() == Scalars.size()) + return IsSame(Scalars, Mask); + if (VL.size() == ReuseShuffleIndices.size()) { + ::addMask(Mask, ReuseShuffleIndices); + return IsSame(Scalars, Mask); + } + return false; + } + return IsSame(Scalars, ReuseShuffleIndices); } /// A vector of scalars. @@ -1701,6 +1710,12 @@ private: } } + /// Reorders operands of the node to the given mask \p Mask. + void reorderOperands(ArrayRef<int> Mask) { + for (ValueList &Operand : Operands) + reorderScalars(Operand, Mask); + } + /// \returns the \p OpIdx operand of this TreeEntry. ValueList &getOperand(unsigned OpIdx) { assert(OpIdx < Operands.size() && "Off bounds"); @@ -1760,19 +1775,14 @@ private: return AltOp ? AltOp->getOpcode() : 0; } - /// Update operations state of this entry if reorder occurred. - bool updateStateIfReorder() { - if (ReorderIndices.empty()) - return false; - InstructionsState S = getSameOpcode(Scalars, ReorderIndices.front()); - setOperations(S); - return true; - } - /// When ReuseShuffleIndices is empty it just returns position of \p V - /// within vector of Scalars. Otherwise, try to remap on its reuse index. + /// When ReuseReorderShuffleIndices is empty it just returns position of \p + /// V within vector of Scalars. Otherwise, try to remap on its reuse index. int findLaneForValue(Value *V) const { unsigned FoundLane = std::distance(Scalars.begin(), find(Scalars, V)); assert(FoundLane < Scalars.size() && "Couldn't find extract lane"); + if (!ReorderIndices.empty()) + FoundLane = ReorderIndices[FoundLane]; + assert(FoundLane < Scalars.size() && "Couldn't find extract lane"); if (!ReuseShuffleIndices.empty()) { FoundLane = std::distance(ReuseShuffleIndices.begin(), find(ReuseShuffleIndices, FoundLane)); @@ -1856,7 +1866,7 @@ private: TreeEntry *newTreeEntry(ArrayRef<Value *> VL, Optional<ScheduleData *> Bundle, const InstructionsState &S, const EdgeInfo &UserTreeIdx, - ArrayRef<unsigned> ReuseShuffleIndices = None, + ArrayRef<int> ReuseShuffleIndices = None, ArrayRef<unsigned> ReorderIndices = None) { TreeEntry::EntryState EntryState = Bundle ? TreeEntry::Vectorize : TreeEntry::NeedToGather; @@ -1869,7 +1879,7 @@ private: Optional<ScheduleData *> Bundle, const InstructionsState &S, const EdgeInfo &UserTreeIdx, - ArrayRef<unsigned> ReuseShuffleIndices = None, + ArrayRef<int> ReuseShuffleIndices = None, ArrayRef<unsigned> ReorderIndices = None) { assert(((!Bundle && EntryState == TreeEntry::NeedToGather) || (Bundle && EntryState != TreeEntry::NeedToGather)) && @@ -1877,12 +1887,25 @@ private: VectorizableTree.push_back(std::make_unique<TreeEntry>(VectorizableTree)); TreeEntry *Last = VectorizableTree.back().get(); Last->Idx = VectorizableTree.size() - 1; - Last->Scalars.insert(Last->Scalars.begin(), VL.begin(), VL.end()); Last->State = EntryState; Last->ReuseShuffleIndices.append(ReuseShuffleIndices.begin(), ReuseShuffleIndices.end()); - Last->ReorderIndices.append(ReorderIndices.begin(), ReorderIndices.end()); - Last->setOperations(S); + if (ReorderIndices.empty()) { + Last->Scalars.assign(VL.begin(), VL.end()); + Last->setOperations(S); + } else { + // Reorder scalars and build final mask. + Last->Scalars.assign(VL.size(), nullptr); + transform(ReorderIndices, Last->Scalars.begin(), + [VL](unsigned Idx) -> Value * { + if (Idx >= VL.size()) + return UndefValue::get(VL.front()->getType()); + return VL[Idx]; + }); + InstructionsState S = getSameOpcode(Last->Scalars); + Last->setOperations(S); + Last->ReorderIndices.append(ReorderIndices.begin(), ReorderIndices.end()); + } if (Last->State != TreeEntry::NeedToGather) { for (Value *V : VL) { assert(!getTreeEntry(V) && "Scalar already in tree!"); @@ -2431,14 +2454,6 @@ private: } }; - /// Contains orders of operations along with the number of bundles that have - /// operations in this order. It stores only those orders that require - /// reordering, if reordering is not required it is counted using \a - /// NumOpsWantToKeepOriginalOrder. - DenseMap<OrdersType, unsigned, OrdersTypeDenseMapInfo> NumOpsWantToKeepOrder; - /// Number of bundles that do not require reordering. - unsigned NumOpsWantToKeepOriginalOrder = 0; - // Analysis and block reference. Function *F; ScalarEvolution *SE; @@ -2591,21 +2606,439 @@ void BoUpSLP::eraseInstructions(ArrayRef<Value *> AV) { }; } -void BoUpSLP::buildTree(ArrayRef<Value *> Roots, - ArrayRef<Value *> UserIgnoreLst) { - ExtraValueToDebugLocsMap ExternallyUsedValues; - buildTree(Roots, ExternallyUsedValues, UserIgnoreLst); +/// Reorders the given \p Reuses mask according to the given \p Mask. \p Reuses +/// contains original mask for the scalars reused in the node. Procedure +/// transform this mask in accordance with the given \p Mask. +static void reorderReuses(SmallVectorImpl<int> &Reuses, ArrayRef<int> Mask) { + assert(!Mask.empty() && Reuses.size() == Mask.size() && + "Expected non-empty mask."); + SmallVector<int> Prev(Reuses.begin(), Reuses.end()); + Prev.swap(Reuses); + for (unsigned I = 0, E = Prev.size(); I < E; ++I) + if (Mask[I] != UndefMaskElem) + Reuses[Mask[I]] = Prev[I]; } -void BoUpSLP::buildTree(ArrayRef<Value *> Roots, - ExtraValueToDebugLocsMap &ExternallyUsedValues, - ArrayRef<Value *> UserIgnoreLst) { - deleteTree(); - UserIgnoreList = UserIgnoreLst; - if (!allSameType(Roots)) +/// Reorders the given \p Order according to the given \p Mask. \p Order - is +/// the original order of the scalars. Procedure transforms the provided order +/// in accordance with the given \p Mask. If the resulting \p Order is just an +/// identity order, \p Order is cleared. +static void reorderOrder(SmallVectorImpl<unsigned> &Order, ArrayRef<int> Mask) { + assert(!Mask.empty() && "Expected non-empty mask."); + SmallVector<int> MaskOrder; + if (Order.empty()) { + MaskOrder.resize(Mask.size()); + std::iota(MaskOrder.begin(), MaskOrder.end(), 0); + } else { + inversePermutation(Order, MaskOrder); + } + reorderReuses(MaskOrder, Mask); + if (ShuffleVectorInst::isIdentityMask(MaskOrder)) { + Order.clear(); return; - buildTree_rec(Roots, 0, EdgeInfo()); + } + Order.assign(Mask.size(), Mask.size()); + for (unsigned I = 0, E = Mask.size(); I < E; ++I) + if (MaskOrder[I] != UndefMaskElem) + Order[MaskOrder[I]] = I; + fixupOrderingIndices(Order); +} + +void BoUpSLP::reorderTopToBottom() { + // Maps VF to the graph nodes. + DenseMap<unsigned, SmallPtrSet<TreeEntry *, 4>> VFToOrderedEntries; + // ExtractElement gather nodes which can be vectorized and need to handle + // their ordering. + DenseMap<const TreeEntry *, OrdersType> GathersToOrders; + // Find all reorderable nodes with the given VF. + // Currently the are vectorized loads,extracts + some gathering of extracts. + for_each(VectorizableTree, [this, &VFToOrderedEntries, &GathersToOrders]( + const std::unique_ptr<TreeEntry> &TE) { + // No need to reorder if need to shuffle reuses, still need to shuffle the + // node. + if (!TE->ReuseShuffleIndices.empty()) + return; + if (TE->State == TreeEntry::Vectorize && + isa<LoadInst, ExtractElementInst, ExtractValueInst, StoreInst, + InsertElementInst>(TE->getMainOp()) && + !TE->isAltShuffle()) { + VFToOrderedEntries[TE->Scalars.size()].insert(TE.get()); + } else if (TE->State == TreeEntry::NeedToGather && + TE->getOpcode() == Instruction::ExtractElement && + !TE->isAltShuffle() && + isa<FixedVectorType>(cast<ExtractElementInst>(TE->getMainOp()) + ->getVectorOperandType()) && + allSameType(TE->Scalars) && allSameBlock(TE->Scalars)) { + // Check that gather of extractelements can be represented as + // just a shuffle of a single vector. + OrdersType CurrentOrder; + bool Reuse = canReuseExtract(TE->Scalars, TE->getMainOp(), CurrentOrder); + if (Reuse || !CurrentOrder.empty()) { + VFToOrderedEntries[TE->Scalars.size()].insert(TE.get()); + GathersToOrders.try_emplace(TE.get(), CurrentOrder); + } + } + }); + + // Reorder the graph nodes according to their vectorization factor. + for (unsigned VF = VectorizableTree.front()->Scalars.size(); VF > 1; + VF /= 2) { + auto It = VFToOrderedEntries.find(VF); + if (It == VFToOrderedEntries.end()) + continue; + // Try to find the most profitable order. We just are looking for the most + // used order and reorder scalar elements in the nodes according to this + // mostly used order. + const SmallPtrSetImpl<TreeEntry *> &OrderedEntries = It->getSecond(); + // All operands are reordered and used only in this node - propagate the + // most used order to the user node. + DenseMap<OrdersType, unsigned, OrdersTypeDenseMapInfo> OrdersUses; + SmallPtrSet<const TreeEntry *, 4> VisitedOps; + for (const TreeEntry *OpTE : OrderedEntries) { + // No need to reorder this nodes, still need to extend and to use shuffle, + // just need to merge reordering shuffle and the reuse shuffle. + if (!OpTE->ReuseShuffleIndices.empty()) + continue; + // Count number of orders uses. + const auto &Order = [OpTE, &GathersToOrders]() -> const OrdersType & { + if (OpTE->State == TreeEntry::NeedToGather) + return GathersToOrders.find(OpTE)->second; + return OpTE->ReorderIndices; + }(); + // Stores actually store the mask, not the order, need to invert. + if (OpTE->State == TreeEntry::Vectorize && !OpTE->isAltShuffle() && + OpTE->getOpcode() == Instruction::Store && !Order.empty()) { + SmallVector<int> Mask; + inversePermutation(Order, Mask); + unsigned E = Order.size(); + OrdersType CurrentOrder(E, E); + transform(Mask, CurrentOrder.begin(), [E](int Idx) { + return Idx == UndefMaskElem ? E : static_cast<unsigned>(Idx); + }); + fixupOrderingIndices(CurrentOrder); + ++OrdersUses.try_emplace(CurrentOrder).first->getSecond(); + } else { + ++OrdersUses.try_emplace(Order).first->getSecond(); + } + } + // Set order of the user node. + if (OrdersUses.empty()) + continue; + // Choose the most used order. + ArrayRef<unsigned> BestOrder = OrdersUses.begin()->first; + unsigned Cnt = OrdersUses.begin()->second; + for (const auto &Pair : llvm::drop_begin(OrdersUses)) { + if (Cnt < Pair.second || (Cnt == Pair.second && Pair.first.empty())) { + BestOrder = Pair.first; + Cnt = Pair.second; + } + } + // Set order of the user node. + if (BestOrder.empty()) + continue; + SmallVector<int> Mask; + inversePermutation(BestOrder, Mask); + SmallVector<int> MaskOrder(BestOrder.size(), UndefMaskElem); + unsigned E = BestOrder.size(); + transform(BestOrder, MaskOrder.begin(), [E](unsigned I) { + return I < E ? static_cast<int>(I) : UndefMaskElem; + }); + // Do an actual reordering, if profitable. + for (std::unique_ptr<TreeEntry> &TE : VectorizableTree) { + // Just do the reordering for the nodes with the given VF. + if (TE->Scalars.size() != VF) { + if (TE->ReuseShuffleIndices.size() == VF) { + // Need to reorder the reuses masks of the operands with smaller VF to + // be able to find the match between the graph nodes and scalar + // operands of the given node during vectorization/cost estimation. + assert(all_of(TE->UserTreeIndices, + [VF, &TE](const EdgeInfo &EI) { + return EI.UserTE->Scalars.size() == VF || + EI.UserTE->Scalars.size() == + TE->Scalars.size(); + }) && + "All users must be of VF size."); + // Update ordering of the operands with the smaller VF than the given + // one. + reorderReuses(TE->ReuseShuffleIndices, Mask); + } + continue; + } + if (TE->State == TreeEntry::Vectorize && + isa<ExtractElementInst, ExtractValueInst, LoadInst, StoreInst, + InsertElementInst>(TE->getMainOp()) && + !TE->isAltShuffle()) { + // Build correct orders for extract{element,value}, loads and + // stores. + reorderOrder(TE->ReorderIndices, Mask); + if (isa<InsertElementInst, StoreInst>(TE->getMainOp())) + TE->reorderOperands(Mask); + } else { + // Reorder the node and its operands. + TE->reorderOperands(Mask); + assert(TE->ReorderIndices.empty() && + "Expected empty reorder sequence."); + reorderScalars(TE->Scalars, Mask); + } + if (!TE->ReuseShuffleIndices.empty()) { + // Apply reversed order to keep the original ordering of the reused + // elements to avoid extra reorder indices shuffling. + OrdersType CurrentOrder; + reorderOrder(CurrentOrder, MaskOrder); + SmallVector<int> NewReuses; + inversePermutation(CurrentOrder, NewReuses); + addMask(NewReuses, TE->ReuseShuffleIndices); + TE->ReuseShuffleIndices.swap(NewReuses); + } + } + } +} + +void BoUpSLP::reorderBottomToTop() { + SetVector<TreeEntry *> OrderedEntries; + DenseMap<const TreeEntry *, OrdersType> GathersToOrders; + // Find all reorderable leaf nodes with the given VF. + // Currently the are vectorized loads,extracts without alternate operands + + // some gathering of extracts. + SmallVector<TreeEntry *> NonVectorized; + for_each(VectorizableTree, [this, &OrderedEntries, &GathersToOrders, + &NonVectorized]( + const std::unique_ptr<TreeEntry> &TE) { + // No need to reorder if need to shuffle reuses, still need to shuffle the + // node. + if (!TE->ReuseShuffleIndices.empty()) + return; + if (TE->State == TreeEntry::Vectorize && + isa<LoadInst, ExtractElementInst, ExtractValueInst>(TE->getMainOp()) && + !TE->isAltShuffle()) { + OrderedEntries.insert(TE.get()); + } else if (TE->State == TreeEntry::NeedToGather && + TE->getOpcode() == Instruction::ExtractElement && + !TE->isAltShuffle() && + isa<FixedVectorType>(cast<ExtractElementInst>(TE->getMainOp()) + ->getVectorOperandType()) && + allSameType(TE->Scalars) && allSameBlock(TE->Scalars)) { + // Check that gather of extractelements can be represented as + // just a shuffle of a single vector with a single user only. + OrdersType CurrentOrder; + bool Reuse = canReuseExtract(TE->Scalars, TE->getMainOp(), CurrentOrder); + if ((Reuse || !CurrentOrder.empty()) && + !any_of( + VectorizableTree, [&TE](const std::unique_ptr<TreeEntry> &Entry) { + return Entry->State == TreeEntry::NeedToGather && + Entry.get() != TE.get() && Entry->isSame(TE->Scalars); + })) { + OrderedEntries.insert(TE.get()); + GathersToOrders.try_emplace(TE.get(), CurrentOrder); + } + } + if (TE->State != TreeEntry::Vectorize) + NonVectorized.push_back(TE.get()); + }); + + // Checks if the operands of the users are reordarable and have only single + // use. + auto &&CheckOperands = + [this, &NonVectorized](const auto &Data, + SmallVectorImpl<TreeEntry *> &GatherOps) { + for (unsigned I = 0, E = Data.first->getNumOperands(); I < E; ++I) { + if (any_of(Data.second, + [I](const std::pair<unsigned, TreeEntry *> &OpData) { + return OpData.first == I && + OpData.second->State == TreeEntry::Vectorize; + })) + continue; + ArrayRef<Value *> VL = Data.first->getOperand(I); + const TreeEntry *TE = nullptr; + const auto *It = find_if(VL, [this, &TE](Value *V) { + TE = getTreeEntry(V); + return TE; + }); + if (It != VL.end() && TE->isSame(VL)) + return false; + TreeEntry *Gather = nullptr; + if (count_if(NonVectorized, [VL, &Gather](TreeEntry *TE) { + assert(TE->State != TreeEntry::Vectorize && + "Only non-vectorized nodes are expected."); + if (TE->isSame(VL)) { + Gather = TE; + return true; + } + return false; + }) > 1) + return false; + if (Gather) + GatherOps.push_back(Gather); + } + return true; + }; + // 1. Propagate order to the graph nodes, which use only reordered nodes. + // I.e., if the node has operands, that are reordered, try to make at least + // one operand order in the natural order and reorder others + reorder the + // user node itself. + SmallPtrSet<const TreeEntry *, 4> Visited; + while (!OrderedEntries.empty()) { + // 1. Filter out only reordered nodes. + // 2. If the entry has multiple uses - skip it and jump to the next node. + MapVector<TreeEntry *, SmallVector<std::pair<unsigned, TreeEntry *>>> Users; + SmallVector<TreeEntry *> Filtered; + for (TreeEntry *TE : OrderedEntries) { + if (!(TE->State == TreeEntry::Vectorize || + (TE->State == TreeEntry::NeedToGather && + TE->getOpcode() == Instruction::ExtractElement)) || + TE->UserTreeIndices.empty() || !TE->ReuseShuffleIndices.empty() || + !all_of(drop_begin(TE->UserTreeIndices), + [TE](const EdgeInfo &EI) { + return EI.UserTE == TE->UserTreeIndices.front().UserTE; + }) || + !Visited.insert(TE).second) { + Filtered.push_back(TE); + continue; + } + // Build a map between user nodes and their operands order to speedup + // search. The graph currently does not provide this dependency directly. + for (EdgeInfo &EI : TE->UserTreeIndices) { + TreeEntry *UserTE = EI.UserTE; + auto It = Users.find(UserTE); + if (It == Users.end()) + It = Users.insert({UserTE, {}}).first; + It->second.emplace_back(EI.EdgeIdx, TE); + } + } + // Erase filtered entries. + for_each(Filtered, + [&OrderedEntries](TreeEntry *TE) { OrderedEntries.remove(TE); }); + for (const auto &Data : Users) { + // Check that operands are used only in the User node. + SmallVector<TreeEntry *> GatherOps; + if (!CheckOperands(Data, GatherOps)) { + for_each(Data.second, + [&OrderedEntries](const std::pair<unsigned, TreeEntry *> &Op) { + OrderedEntries.remove(Op.second); + }); + continue; + } + // All operands are reordered and used only in this node - propagate the + // most used order to the user node. + DenseMap<OrdersType, unsigned, OrdersTypeDenseMapInfo> OrdersUses; + SmallPtrSet<const TreeEntry *, 4> VisitedOps; + for (const auto &Op : Data.second) { + TreeEntry *OpTE = Op.second; + if (!OpTE->ReuseShuffleIndices.empty()) + continue; + const auto &Order = [OpTE, &GathersToOrders]() -> const OrdersType & { + if (OpTE->State == TreeEntry::NeedToGather) + return GathersToOrders.find(OpTE)->second; + return OpTE->ReorderIndices; + }(); + // Stores actually store the mask, not the order, need to invert. + if (OpTE->State == TreeEntry::Vectorize && !OpTE->isAltShuffle() && + OpTE->getOpcode() == Instruction::Store && !Order.empty()) { + SmallVector<int> Mask; + inversePermutation(Order, Mask); + unsigned E = Order.size(); + OrdersType CurrentOrder(E, E); + transform(Mask, CurrentOrder.begin(), [E](int Idx) { + return Idx == UndefMaskElem ? E : static_cast<unsigned>(Idx); + }); + fixupOrderingIndices(CurrentOrder); + ++OrdersUses.try_emplace(CurrentOrder).first->getSecond(); + } else { + ++OrdersUses.try_emplace(Order).first->getSecond(); + } + if (VisitedOps.insert(OpTE).second) + OrdersUses.try_emplace({}, 0).first->getSecond() += + OpTE->UserTreeIndices.size(); + --OrdersUses[{}]; + } + // If no orders - skip current nodes and jump to the next one, if any. + if (OrdersUses.empty()) { + for_each(Data.second, + [&OrderedEntries](const std::pair<unsigned, TreeEntry *> &Op) { + OrderedEntries.remove(Op.second); + }); + continue; + } + // Choose the best order. + ArrayRef<unsigned> BestOrder = OrdersUses.begin()->first; + unsigned Cnt = OrdersUses.begin()->second; + for (const auto &Pair : llvm::drop_begin(OrdersUses)) { + if (Cnt < Pair.second || (Cnt == Pair.second && Pair.first.empty())) { + BestOrder = Pair.first; + Cnt = Pair.second; + } + } + // Set order of the user node (reordering of operands and user nodes). + if (BestOrder.empty()) { + for_each(Data.second, + [&OrderedEntries](const std::pair<unsigned, TreeEntry *> &Op) { + OrderedEntries.remove(Op.second); + }); + continue; + } + // Erase operands from OrderedEntries list and adjust their orders. + VisitedOps.clear(); + SmallVector<int> Mask; + inversePermutation(BestOrder, Mask); + SmallVector<int> MaskOrder(BestOrder.size(), UndefMaskElem); + unsigned E = BestOrder.size(); + transform(BestOrder, MaskOrder.begin(), [E](unsigned I) { + return I < E ? static_cast<int>(I) : UndefMaskElem; + }); + for (const std::pair<unsigned, TreeEntry *> &Op : Data.second) { + TreeEntry *TE = Op.second; + OrderedEntries.remove(TE); + if (!VisitedOps.insert(TE).second) + continue; + if (!TE->ReuseShuffleIndices.empty() && TE->ReorderIndices.empty()) { + // Just reorder reuses indices. + reorderReuses(TE->ReuseShuffleIndices, Mask); + continue; + } + // Gathers are processed separately. + if (TE->State != TreeEntry::Vectorize) + continue; + assert((BestOrder.size() == TE->ReorderIndices.size() || + TE->ReorderIndices.empty()) && + "Non-matching sizes of user/operand entries."); + reorderOrder(TE->ReorderIndices, Mask); + } + // For gathers just need to reorder its scalars. + for (TreeEntry *Gather : GatherOps) { + if (!Gather->ReuseShuffleIndices.empty()) + continue; + assert(Gather->ReorderIndices.empty() && + "Unexpected reordering of gathers."); + reorderScalars(Gather->Scalars, Mask); + OrderedEntries.remove(Gather); + } + // Reorder operands of the user node and set the ordering for the user + // node itself. + if (Data.first->State != TreeEntry::Vectorize || + !isa<ExtractElementInst, ExtractValueInst, LoadInst>( + Data.first->getMainOp()) || + Data.first->isAltShuffle()) + Data.first->reorderOperands(Mask); + if (!isa<InsertElementInst, StoreInst>(Data.first->getMainOp()) || + Data.first->isAltShuffle()) { + reorderScalars(Data.first->Scalars, Mask); + reorderOrder(Data.first->ReorderIndices, MaskOrder); + if (Data.first->ReuseShuffleIndices.empty() && + !Data.first->ReorderIndices.empty() && + !Data.first->isAltShuffle()) { + // Insert user node to the list to try to sink reordering deeper in + // the graph. + OrderedEntries.insert(Data.first); + } + } else { + reorderOrder(Data.first->ReorderIndices, Mask); + } + } + } +} +void BoUpSLP::buildExternalUses( + const ExtraValueToDebugLocsMap &ExternallyUsedValues) { // Collect the values that we need to extract from the tree. for (auto &TEPtr : VectorizableTree) { TreeEntry *Entry = TEPtr.get(); @@ -2664,6 +3097,80 @@ void BoUpSLP::buildTree(ArrayRef<Value *> Roots, } } +void BoUpSLP::buildTree(ArrayRef<Value *> Roots, + ArrayRef<Value *> UserIgnoreLst) { + deleteTree(); + UserIgnoreList = UserIgnoreLst; + if (!allSameType(Roots)) + return; + buildTree_rec(Roots, 0, EdgeInfo()); +} + +namespace { +/// Tracks the state we can represent the loads in the given sequence. +enum class LoadsState { Gather, Vectorize, ScatterVectorize }; +} // anonymous namespace + +/// Checks if the given array of loads can be represented as a vectorized, +/// scatter or just simple gather. +static LoadsState canVectorizeLoads(ArrayRef<Value *> VL, const Value *VL0, + const TargetTransformInfo &TTI, + const DataLayout &DL, ScalarEvolution &SE, + SmallVectorImpl<unsigned> &Order, + SmallVectorImpl<Value *> &PointerOps) { + // Check that a vectorized load would load the same memory as a scalar + // load. For example, we don't want to vectorize loads that are smaller + // than 8-bit. Even though we have a packed struct {<i2, i2, i2, i2>} LLVM + // treats loading/storing it as an i8 struct. If we vectorize loads/stores + // from such a struct, we read/write packed bits disagreeing with the + // unvectorized version. + Type *ScalarTy = VL0->getType(); + + if (DL.getTypeSizeInBits(ScalarTy) != DL.getTypeAllocSizeInBits(ScalarTy)) + return LoadsState::Gather; + + // Make sure all loads in the bundle are simple - we can't vectorize + // atomic or volatile loads. + PointerOps.clear(); + PointerOps.resize(VL.size()); + auto *POIter = PointerOps.begin(); + for (Value *V : VL) { + auto *L = cast<LoadInst>(V); + if (!L->isSimple()) + return LoadsState::Gather; + *POIter = L->getPointerOperand(); + ++POIter; + } + + Order.clear(); + // Check the order of pointer operands. + if (llvm::sortPtrAccesses(PointerOps, ScalarTy, DL, SE, Order)) { + Value *Ptr0; + Value *PtrN; + if (Order.empty()) { + Ptr0 = PointerOps.front(); + PtrN = PointerOps.back(); + } else { + Ptr0 = PointerOps[Order.front()]; + PtrN = PointerOps[Order.back()]; + } + Optional<int> Diff = + getPointersDiff(ScalarTy, Ptr0, ScalarTy, PtrN, DL, SE); + // Check that the sorted loads are consecutive. + if (static_cast<unsigned>(*Diff) == VL.size() - 1) + return LoadsState::Vectorize; + Align CommonAlignment = cast<LoadInst>(VL0)->getAlign(); </cut>

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