- linaro-toolchain - lists.linaro.org

[Weekly] 20-24 JULY 2015

by Michael Collison

== This week == * TCWG-146 - Detect smin/umin idiom (1/10) - Made change recommended upstream and resubmitted * TCWG-140 - Transform end of loop conditions to min_expr (1/10) - Validated and submitted upstream * TCWG-833 - Exploit Wide Add operations when appropriate (5/10) - Added early clobber and forced operand 0 and operand 2 to match - Finished Aarch32 by using mode iterators - Developed patch for Aarch64 - Wide add instructions are now emitted for both Aarch32 and Aarch64 * TCWG-834 - Use non-unit stride loads by preference when applicable (2/10) - Further Aarch32 investigation * Misc (1/10) - Conference calls == Next week == - Validate patches for TCWG-833 and submit upstream - Further TCWG-834 investigation - Linaro connect presentation preparation

11 years, 2 months

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[activity] 20 - 24 July 2015

by Prathamesh Kulkarni

* TCWG-835 (6/10) - Looked at newton raphson method - Need to write new md pattern that matches sdiv_optab for modes == v2sf, v4sf - First attempt for patch: http://pastebin.com/NKy8WdWC * TCWG-830 (2/10) - Ran Charles's benchmarks on ARM and AArch64. - Investigating testsuite fallout for ARM patch. - Still blocked by permissions to do benchmarking * Misc (2/10) - Conference Calls - US visa collection == Next Week == - Continue with TCWG-830, TCWG-835, TCWG-777

11 years, 2 months

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binutils - question on decoding decision tree for aarch64

by Virendra Kumar Pathak

Hi Linaro Toolchain Group, I am trying to learn the 'decoding decision tree' for aarch64 in binutils by trying to add a new assembly instruction 'addvp'. For example: addvp x0, x0, 9 For this, I added a entry in struct aarch64_opcode aarch64_opcode_table[] (file opcodes/aarch64-tbl.h) as below: {"addvp", 0x01000000, 0x7f000000, addsub_imm, 0, CORE, OP3 (Rd_SP, Rn_SP, AIMM), QL_R2NIL, F_SF}, ARM manual say, bit 27 & bit 28 are unallocated. Thus for addvp, I am giving opcode 01000000 (with bit 27 & 28 as 0). With this, generating object file from assembly file is successful (test.s --> test.o); but while disassembling using objdump, it say undefined instruction. >From objdump log: 81002400 .inst 0x81002400 ; undefined (but instruction was generated correct i.e. 81002400 !!!). I know since addvp is a hack instruction, it won't execute on cpu. But still disassembly should succeed. 1. Please help me in knowing what I am doing wrong here ? What else I should do to add a new instruction in binutils ? 2. I also saw some printf in opcodes/aarch64-gen.c which I guess create decoding tree (initialize_decoder_tree()). How to print them ? I made debug =1 but still print is not coming. 3. There are some auto-generated files like aarch64-asm-2.c, aarch64-dis-2.c. How to re-generate them ? Thanks. -- with regards, Virendra Kumar Pathak

11 years, 2 months

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[ACTIVITY]

by Renato Golin

== Progress == * Maintenance (CARD-1833 5/10) - Building libc++/abi/unwind in LLVM/Clang tree - Fixing some build errors (D11486) - Addressing comments to submissions from last week - Committing approved ones - Re-working the others * Releases (CARD-1431 1/10) - Building 3.7.0-RC1 on ARM and AArch64, uploading * Benchmarks (CARD-716 2/10) - Running LNT, SPEC and EEMBC on ARM and AArch64 for 3.7.0 * Background (2/10) - Code review, meetings, discussions, etc. - Upgraded APM to Debian, kernel 3.16 - Perf still segfaults. :( == Plan == * Finish open reviews * Continue getting libc++ to build and pass the tests in tree * Look at some of the performance regressions in 3.7

11 years, 2 months

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[ACTIVITY] 20th - 24th July

by Yao Qi

# Progress # * TCWG-806, aarch64 remote debugging multi-arch support. [4/10] Patches are done. Need to test them and polish them. Fix various multi-arch issues when --wrapper is used in GDBserver. Patches are pushed in to mainline. * TCWG-876 [1/10] Re-run GDB testsuite with incoming Linaro toolchain release. Everything looks OK. * TCWG-860, aarch64 fast tracepoint. [1/10] Polish the patches, and ready for submission. * TCWG-757, upstream patch review. [2/10]. * Misc, meeting. [2/10] # Plan # * TCWG-806, test patches on different targets, polish patches and post them for review. # Absence # 06th Aug - 10th Aug, GNU Tools Cauldron. 11th Aug - 14th Aug, Holiday. -- Yao

11 years, 2 months

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[ACTIVITY] 20th - 24th July

by Bernie Ogden

Benchmark infrastructure - TCWG-360 [6/10] * Some user support/bugfixing/bugraising * Multinode job more or less working (not fully tested) * Additional restructuring got rid of some more complexity ** Though if my simplifying assumption doesn't hold, I'll have to put it back Benchmarking 101 presentation [2/10] * Ran through slides with Ryan & Maxim * Removed many slides * Collected up and categorized the removed slides ** Probably will go into future presentation(s) Misc [2/10] =Plan= * Tweak multinode a little more * Integrate multinode into Jenkins ** To the extent that I'm comfortable with the security * Read a bit about some benchmarks that aren't SPEC * Start noise control experiments (may inform presentation) =Week After Next= Holiday

11 years, 2 months

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[ACTIVITY] Week 29

by Yvan Roux

* One day off - Bastille day (2/10) == Progress == o Upstream GCC (3/10) * Finalized and committed fix in trunk for Linaro bug #416 o Linaro GCC release (4/10) * Reviewed and did more patches for tcwg-release script * Still investigate validation issues. * Prepared FSF branch merge into Linaro GCC 5 branch o Misc (1/10) * Various meetings == Plan == - Summer Holidays (2 weeks)

11 years, 2 months

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[ACTIVITY] 13-17 July 2015

by Kugan

== Progress == * Add REG_EQUAL note for arm_emit_movpair (1/10) - Patch2 ok to commit. - Ran complete validation. - Found an issue and posted a patch to fix * Factor conversion out of COND_EXPR - TCWG-849 (6/10) - Found a performance regression in tree-ssa-reasoc - Looked at the tree-ssa-reasoc code to see possible fixes - Posted an RFC patch * PR66865 - Wine segfaults from gcc in trunk (r225757) - Reproduced it but turned out not from my commit - Fixed by other PR * Misc (2/10) - Looked at interaction between gcc optimization passes - gcc-patches, gcc-bugs list - Meetings == Plan == - GCC Bugs - TACT driven optimization exploration for gcc - Linaro bug 1318

11 years, 2 months

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[ACTIVITY] 13th - 17th June

by Bernie Ogden

Benchmark infrastructure - TCWG-360 [5/10] * Worked through my Jenkins issues with Fathi, raised some tickets at him * Converting LAVA end into multinode job ** Having some trouble with multinode API Benchmarking 101 presentation [3/10] * 1/2 day of discussions/reading, full day of redrafting * Looked for Michael Hope's similar 2012 presentation ** Found slides, not video =Plan= * Complete multinode job * Integrate into Jenkins to the extent that I'm comfortable * Complete 'shareable' draft of benchmarking-101 ** And see if I have enough left over for -102, maybe -103

11 years, 2 months

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[Weekly] 13-17 JULY 2015

by Michael Collison

== This week == * TCWG-140 - Transform end of loop conditions to min_expr (1/10) - Blocked waiting on validation * TCWG-833 - Exploit Wide Add operations when appropriate (7/10) - Developed patch to handle signed and unsigned cases for Aarc32 - Investigation and debugging into support for Aarch64 * TCWG-834 - Use non-unit stride loads by preference when applicable (1/10) - Initial Aarch32 investigation * Misc (1/10) - Conference calls == Next week == - Validate Aarch32 patch for TCWG-833 - Develop Aarch64 patch for TCWG-833 - Validate TCWG-140 - Make recommended fixes to TCWG-146 and resubmit upstream

11 years, 2 months

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[activity] 13 - 17 July 2015

by Prathamesh Kulkarni

* TCWG-777 (3/10) - O2 workaround: -fno-tree-pre -fno-tree-fre -fno-tree-dominator-opts -fno-gcse -fno-peephole2 - Observing rtl dumps for gcse, combine, peephole2 with different options and optimization levels. - Continued investigating ICE during gcc build with my pass applied. - Sent mail to tcwg, for further suggestions * TCWG-830 (2/10) - Verified the behavior for aarch64, and extended patch for aarc64 along same lines. - Running Charles's microbenchmarks on r1-a7 - Benchmarking setup with Bernie. Blocked by permissions, sent a mail to lava-lab, for granting requisite permissions * TCWG-835 (2/10) - observing vector and asm dumps * Misc (3/10) - Travel to Mumbai for US Visa Interview - Conference Calls == Next Week == - Continue with TCWG-777, TCWG-835, TCWG-830

11 years, 2 months

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Re: abe: cross native toolchain compilation for aarch64-linux-gnu

by strongq

I'm trying to build the toolchain as win32 executable on Ubuntu with ABE. I'm pretty new with ABE. I followed the FAQ https://wiki.linaro.org/WorkingGroups/ToolChain/FAQ and Rob's post. Also checked the MakeRelease.job and slave.sh. I have all packages listed in the slave.sh installed. So I assume I have all dependencies ready for the build. Here is what I have done: Create _build subfolder beside abe CD to _build and run: ../abe/configure --with-fileserver=148.251.136.42 --with-remote-snapshots=/snapshots-ref First build this: ../abe/abe.sh --target aarch64-none-elf -build all It installed the toolchain to _build/builds/destdir/x86_64-unknown-gnu-linux. I added the bin under it to my PATH Then do 2nd round build: ../abe/abe.sh -host i686-w64-mingw32 --target aarch64-none-elf -build all However, I'm getting config error while it building libiberty: configure:5946: checking for library containing strerror Configure:5978: error: Link tests are not allowed after GCC_NO_EXECUTABLES. My understanding is that the linker cannot find glibc or eglibc. What have I missed? Any where I can find detail instruction like step by step to build Linaro toolchain for running on Windows host? Sincerely, Qyq

11 years, 2 months

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[ACTIVITY]

by Renato Golin

== Progress == * Maintenance (CARD-1833 4/10) - Clang driver: - Passing -Wa,-mfpu and friends to assembler (D11147, D11148) - Passing -I to assembler (D11185) - Don't include libgcc/asm if using libunwind/libc++abi (D11153) - Asm warnings: - Trying again to look for a way to disable asm warnings from clang (D11216) * Benchmarks (CARD-716 3/10) - Benchmarking shrink-wrapping in AArch64 - Setting up LNT Benchmarks on A32/A64 - Scripts to collate / compare LNT results on the fly - Benchmarking LNT on 3.5.2 and 3.6.2 on ARM and AArch64 - Multisampling, perf, and all goodness - Getting ready to compare with 3.7.0 to come * Releases (CARD-1431 1/10) - Spinning release 3.7.0 - Many changes, CMake builds, etc. - Fixing the test-release.sh script (D11326) * Background (2/10) - Code review, meetings, discussions, etc. - Upgrading APM to Debian 3.16 == Plan == * Upstreaming pending reviews * Continue release 3.7.0, benchmark it * Start looking at the effects of the stride vectorizer on ARM/AArch64

11 years, 2 months

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[Activity] July 13 - July 17

by Yao Qi

# Progress # * TCWG-806, aarch64 remote debugging multi-arch support. [6/10] Some code refactor and fix various multi-arch issues when --wrapper is used in GDBserver. Patches are being tested. * TCWG-757, Patches review. [2/10] * Misc, meeting, [2/10] # Plan # * TCWG-806, aarch64 remote debugging multi-arch support. # Absence # * 06th Aug - 10th Aug, GNU Tools Cauldron. * 11th Aug - 14th Aug, Holiday. -- Yao

11 years, 2 months

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[ACTIVITY] 13-17 July 2015

by Christophe Lyon

1 day off (2/10) == Progress == * backports/release/infra (1/10) - reviews * GCC (3/10) - posted patch to fix vget_lane on armeb - investigating AdvSIMD failures on aarch64_be. Having a way to debug target code would help (qemu does not seem to support aarch64_be yet, and I use the foundation model in bare metal mode) * Misc (4/10) - meetings, conf-calls, emails == Next == Holidays until Aug 3rd.

11 years, 2 months

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[ACTIVITY] 6th - 10th June

by Bernie Ogden

Benchmark infrastructure - TCWG-360 [5/10] * More thinking/prototyping sufficiently-secure Jenkins benchmarking * Converting LAVA end into multinode job Benchmarking presentation [2/10] * A couple of helpful discussions * Read a couple of helpful docs Misc [3/10] =Plan= * Complete multinode job * Settle on a plan for Jenkins * Redraft presentation

11 years, 2 months

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[activity] 6 - 10 july 2015

by Prathamesh Kulkarni

== This Week == * TCWG-777 (4/10) - Resolved ICE caused by pass during gcc build but hit another ICE: http://pastebin.com/RUAY6scB - Current pass state: http://pastebin.com/AGXnSkrZ - For test-case: void f(int flags) { void foo(void); if (flags & 1) foo(); } - temporaries don't exist for -O1 - for -O2 temps introduced by peephole2 due to define_peephole2 pattern in thumb2.md:1540 http://pastebin.com/3rEF8Te4 So this intentionally transforms rtx from zeroextractsi_compare0_scratch to rtx from shiftsi3_compare0_scratch. Why is it beneficial to do this transform ? - Looking into combine pass - For above test-case works with -marm for -O2. * TCWG-830 (3/10) - trying to understand vect dump - untested patch: http://pastebin.com/K4UX5iYz * Misc (2/10) - Started looking at TCWG-835, loop vectorized on x86 but not arm - Committed fix to segfault on -dx - Conference calls == Next Week == - Continue with TCWG-777, TCWG-830, TCWG-835 - Travel to Mumbai on 14th July (Tuesday) for US Visa Interview with US Consulate.

11 years, 2 months

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[ACTIVITY] Week 28

by Yvan Roux

Hospital and physio (2/10) == Progress == o Upstream GCC (2/10) * More work on ongoing patches o Linaro GCC release (3/10) * Reviewed patches for tcwg-release script * Looked at validation issues and redo backports for 5.1 o Misc (3/10) * Various meetings * Upstream libunwind support == Plan == - Continue ongoing tasks

11 years, 2 months

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[ACTIVITY] 06 - 10 July 2015

by Omair Javaid

== Progress == LLDB development -- Debugging problems with process launch and debugserver crash on remote connection. [TCWG-855] [6/10] -- Caught the notorious issue mentioned above fix can be found here http://reviews.llvm.org/D11129. -- Figured arm lldb and lldbserver host builds on chromebook will put steps on collaborate LLDB page soon. [1/10] Miscellaneous [3/10] -- Travel to Islamabad for Czech Republic visa -- Meetings, emails, discussions etc. == Plan == LLDB development -- Follow up review process for process launch bug fix. -- Run testsuite for armhf and figure out issues to fix. -- Submit patches to fix build on older version of gcc. Eid Holidays 17th to 21st July 2015

11 years, 2 months

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[Weekly] 06-10 JULY 2015

by Michael Collison

== This week == * TCWG-146 - Detect smin/umin idion (0/10) - Waiting for upstream approval/review * TCWG-140 - Transform end of loop conditions to min_expr (1/10) - Blocked waiting on validation * TCWG-833 - Exploit Wide Add operations when appropriate (8/10) - Mere detailed investigation - Working theory is to develop wide add rtl patterns that incorporate vec_unpack to widen 16-bit to 32-bit * Misc (1/10) - Conference calls - Conference call with Charles and Prathamesh to discuss autovectorization progress == Next week == - Validate patch for TCWG-140 - Develop patch for TCWG-833 - Validate TCWG-833 if successful patch is developed - Investigate Aarch64 implementation

11 years, 2 months

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[ACTIVITY] 6-10 July 2015

by Kugan

== Progress == * Add REG_EQUAL note for arm_emit_movpair (1/10) - committed patch1 after testing again * Factor conversion out of COND_EXPR - TCWG-849 (5/10) - Gone through couple of iterations and committed the patch - There are still some improvements need as follow up patches * TACT -TCWG-851 (2/10) - Started looking into spec2k * Misc (2/10) - Looked at interaction between gcc optimization passes - gcc-patches, gcc-bugs list - Meetings == Plan == - GCC Bugs - TACT driven optimization exploration for gcc - Linaro bug 1318

11 years, 2 months

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[ACTIVITY]

by Renato Golin

== Progress == * Releases (CARD-1431 1/10) - Released 3.6.2-final * Maintenance (CARD-1833 5/10) - Reducing runtime of some benchmarks in LLVM's test-suite by getting rid of millions of useless fprintf calls. - Working on https://llvm.org/PR20700 some more * Background (4/10) - Code review, meetings, discussions, etc. - Long TargetTuple review (D10969) / discussions - Replacing broken buildbot USB disks (need to buy more) - Bisecting self-hosting bot breakage - Testing patches for ARM - Jira farming == Plan == * continue PR20700 * continue review/discussion of TargetTuple * look again at PR20757 * maybe look at PR21000

11 years, 2 months

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[ACTIVITY] 6-10 July 2015

by Christophe Lyon

* Off Monday (2/10) == Progress == * published linaro-4.8 and 4.9 2015.06 releases * linaro-5.1-2015.07 (1/10) - backport reviews - updated my helper script for reviews for cope with the git-only branches * upstream (1/10) - started looking at vget_lane Neon intrinsic failure on armeb * infra/release/backports (2/10) - reviews * Misc (4/10) - meetings, conf-calls, emails == Next == * Off Tuesday * backports, release, validation: update doc * backports, reviews * upstream work == Later == * Off July 18th-Aug 3rd

11 years, 2 months

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[Activity] July 6 - July 10

by Yao Qi

# Progress # * TCWG-805, aarch64 native debugging multi-arch support. [4/10] Patches are committed upstream except patches handling hardware single step on aarch32. TCWG-806, aarch64 remote debugging multi-arch support. Some code refactor. * TCWG-876, FSF GDB 7.10 release. [3/10] Update ABE config files to include GDB 7.10 branch in the build. Patch is pushed in. Look at some regressions (on all platforms) to fix. * TCWG-757, Patches review. [1/10] * TCWG-858, Patches are pushed in. [1/10] * Misc, meeting, [1/10] # Plan # * TCWG-806, aarch64 remote debugging multi-arch support. * TCWG-757, Fix regressions in FSF GDB 7.10 branch. -- Yao

11 years, 2 months

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Run time comparison of sin() in libm

by Virendra Kumar Pathak

Hi Linaro Toolchain Group, I am comparing execution time (run time) of sin() trigonometric function between following glibc (including libm) libraries for aarch64 (juno cortex a57) : Linaro glibc 2.19, Linaro eglibc 2.19, eglibc 2.19 (from http://www.eglibc.org/) and Linaro glibc 2.21. My observation for execution time of sin(): with Linaro glibc 2.19 and eglibc 2.19 = 1m24.703s (approx) whereas, with Linaro eglibc 2.19 & Linaro glibc 2.21 = 0m25.243s (approx) Has Linaro optimized the libm functions for aarch64 in Linaro eglibc 2.19 ? If yes, please point me to relevant reference from where I can find more information on them. Since the eglibc development from version 2.19 has stopped, will Linaro maintain its own development version of glibc ? I am using below snippet code and linux 'time' command to calculate the time. void sin_func(void) { double incr = 0.732; double result, count = 0.0; printf("%s\n", __func__); while (count < 105414350.0) { result = sin(count); count += incr; } } Thanks. -- with regards, Virendra Kumar Pathak

11 years, 2 months

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