- linaro-toolchain - lists.linaro.org

by Richard Sandiford

== This week == * Looked at why the fix for #721531 wasn't working on the Linaro branches. Wrote follow-up patches for both. Fix now committed to 4.5 and 4.6. * Looked at #736007. Submitted and committed patch upstream. * Looked at some "odd" ivopts behaviour. It turned out that this was working mostly as expected. I'm still wondering about a couple of tweaks. * Looked briefly at a miscompilation of vector code that turned out to occur during predictive commoning. I haven't yet checked whether the bug is there or not. For the time being, I'm using -fno-predictive-commoning so that I can get on with other stuff. * Looked at why the auto-inc-dec stuff wasn't as effective with current mainline. It turns out that the new misaligned load/store patterns are using overly weak predicates, so it appears to the RTL optimisers as though we support reg+offset addresses. * Reviewed the shrink-wrap patch. * More auto inc/dec. == Next week == * Backport the fix for #736007. * More loop stuff. Richard

15 years, 4 months

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[ACTIVITY] 4th - 8th July

by Asa Sandahl

Achieved: * HW in place. Borrowed another Panda board that I can use permanently. * linaro-media-create installed and working. Flashed sd-card with 11.05 for Panda board. * Played around with the Panda board. Networking is on the way. I can ssh to my computer from the Panda but not the other way around yet. Issues: * Serial log from Panda board not working yet. Mike suggested I try a straight-through cable instead in of a null-modem cable. (Have not done this yet.) * The ST-E firewall (proxy) is causing me some headache. But at least everyone here is facing the same issues, so there are people to talk to about the problems. Good to know: * I will be on vacation 18th July - 15 August Best Regards Åsa

15 years, 4 months

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[ACTIVITY] July 3-6

by Ira Rosen

Hi, - continued working on prevention of over-widening in vectorization - finalizing the patch - improvement of vectorizer peeling heuristic - merged to gcc-linaro-4.6 - vectorization of widen-mult with over-promoted operands - proposed for merge to gcc-linaro-4.6 - fixed PR 49610 - patch reviews I am on vacation tomorrow and on Sunday. Ira

15 years, 4 months

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LLVM on ARM testing.

by Karel Gardas

Hello, I'm interested in LLVM correct performance on ARM hardware and it looks like LLVM is kind of sensitive to what GCC version is used for its compilation. I tested LLVM 2.9 as a reference point and LLVM HEAD as of June 29 on ARMv7 (two boards with two different Ubuntu versions) compiled by GCC 4.3.4, 4.4.1, 4.4.5, 4.5.2, 4.6.1 Linaro 2011.05 and 4.6.1 Linaro 2011.06. Please see http://ghcarm.wordpress.com/2011/07/03/llvm-on-arm-testing/ It looks like LLVM HEAD does have about 28 regressions in comparison with LLVM 2.9. But also Linaro's GCC 4.6.1s do have some regressions in comparison with older GCC 4.3.4 and 4.4.1. Also what is really interesting with LLVM is how much tests fails when compiled with -O2 or default -O3 compilation option. I don't know if the culprit here is LLVM code or just GCC miscompilation/overoptimization? Is there any testing I may do to help you fix those regressions? Thanks, Karel

15 years, 4 months

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[ACTIVITY] 27th June - 1st July

by Andrew Stubbs

Worked on updates to the widening multiplies patches following upstream review. This was never going to be as easy as it first looked, so I've spent much of the week trying to figure out how make annoying type casts go away. Merged both FSF GCC 4.5 and 4.6 to Linaro GCC. Pushed the new tree to Launchpad for testing. ---- Upstream patched requiring review: * NEON scheduling patch http://gcc.gnu.org/ml/gcc-patches/2011-02/msg01431.html * Widening Multiplies 1/7 http://www.mail-archive.com/gcc-patches@gcc.gnu.org/msg08721.html * Widening Multiplies 2/7 http://www.mail-archive.com/gcc-patches@gcc.gnu.org/msg08723.html * Widening Multiplies 3/7 http://www.mail-archive.com/gcc-patches@gcc.gnu.org/msg08724.html * Widening Multiplies 4/7 http://www.mail-archive.com/gcc-patches@gcc.gnu.org/msg08725.html * Widening Multiplies 5/7 http://www.mail-archive.com/gcc-patches@gcc.gnu.org/msg08726.html * Widening Multiplies 6/7 http://www.mail-archive.com/gcc-patches@gcc.gnu.org/msg08727.html * Widening Multiplies 7/7 http://www.mail-archive.com/gcc-patches@gcc.gnu.org/msg08728.html

15 years, 4 months

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[ACTIVITY] weekly status

by Ken Werner

Hi, * continued to look into how to add remote support for libunwind using ptrace * reworked the lookup of the ARM specific unwind tables for local unwinding * re-use the existent (dwarf related) infrastructure to find the ARM specific unwind tables rather than doing it on our own * removes some code and the limitation of only supporting a certain amount of unw tables * (hopefully) smooths the way for remote unwinding via ptrace * submitted a patch that fixes the syntax of inline assemblies for some GCC versions Regards Ken

15 years, 4 months

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[Activity] June 23 - July 1

by Ramana Radhakrishnan

(This is a combined report having realized that I didn't manage to send this out on Monday because of some power issues). == GCC == == Progress == * Cleared out some backlog of backports from mainline. * Investigating some of the BRANCH_COST results. * Small patches to fix VFP constraints being tested and fixed on trunk upstream. * Upstream bugzilla triaging. * Upstream bugzilla triaging. * Looked at Neon 64 bit arithmetic and sent out report. * Reviewed the unaligned access patch and the EPILOGUE_USES regression with coremark. * Issues with my panda board means my benchmark runs aren't happening. Need to urgently find a way of running them. The panda board dies mysteriously once a while. Playing around with the kernel to get something going . Will look at it again next week. * Merged neon shift immediates patch into linaro-4.6 but needs some rework. * Merged the fix for LP744754 into linaro 4.5 and 4.6 == Plans == * Back on to BRANCH_COST . * Resubmit neon shift immediates patch for merging. * Look at some of the perf regressions between a8 and A9. * Get a working panda board again. ! * Backport arith_shiftsi patch to 4.6 branch upstream. Meetings: * 1-1s * TCWG calls.

15 years, 4 months

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[ACTIVITY] Weekly status

by Richard Sandiford

== This week == * More on the address-of-main() bug. The original patch caused regressions on x86_64, so I submitted a different approach, which has now been applied upstream. * Worked on the libnih bug. It turned out to be a problem in the libc start routine. * A bit of patch review. * More on auto inc/dec. == Next week == * General bug-fixing. * More auto inc/dec. Richard

15 years, 4 months

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[ACTIVITY] 2011-07-01

by David Gilbert

== 64 bit atomics == * Submitted patches to gcc patch list - One comment back already asking if we should really change ARM to have a VDSO to make checks of the user helper version easier * Added thumb ldrexd/strexd to valgrind; patch added to bug in their bugtracker (KDE bug 266035) * Came to the conclusion eglibc doesn't actually need any changes - It's got a place holder for a 64bit routine, but it's unused and isn't exposed to the libc users - Note that neither eglibc or glibc built cleanly from the trunk on ARM. * Started digging into QEmu a bit more to find out how to solve the helper problem == String routines == * Added SPEC2k6 string routine results to my charts; while most stuff is in the noise it seems the bionic routine is a bit slower overall than everything else, and my absolutely trivially simple ~5 instruction loop is a tie for the fastest with my smarter 4 byte/loop using uadd. == Next week == * Sleep, Rest, Relaxation, getting older * (Will be polling email for any more follow ups on my gcc patches) Dave

15 years, 4 months

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[ACTIVITY] Jun 27 - Jul 1

by Ulrich Weigand

== GDB == * Analyzed all failures and skipped tests in remote gdb testsuite. Opened bug reports to track problems and missing features: 804387 [remote testsuite] Shared library test problems 804392 [remote testsuite] Rebuilt executables not copied 804396 [remote testsuite] Spurious failures 804400 [remote testsuite] Unnecessarily disabled tests 804401 [remote testsuite] Thread support 804403 [remote testsuite] Support for "attach" tests 804405 [remote testsuite] Core file tests 804406 [remote feature] Generate core files 804407 [remote feature] fork/vfork/exec events 804408 [remote feature] Address space randomization 804409 [remote feature] Checkpoints 804411 [remote feature] "info proc" == GCC == * Reviewed several Linaro GCC merge requests. * Fixed mainline reload bug PR rtl-optimization/49114 Mit freundlichen Gruessen / Best Regards Ulrich Weigand -- Dr. Ulrich Weigand | Phone: +49-7031/16-3727 STSM, GNU compiler and toolchain for Linux on System z and Cell/B.E. IBM Deutschland Research & Development GmbH Vorsitzender des Aufsichtsrats: Martin Jetter | Geschäftsführung: Dirk Wittkopp Sitz der Gesellschaft: Böblingen | Registergericht: Amtsgericht Stuttgart, HRB 243294

15 years, 4 months

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[ACTIVITY] report week 26

by Peter Maydell

RAG: Red: Amber: Green: Current Milestones: || || Planned || Estimate || Actual || ||qemu-linaro-2011-07 || 2011-07-21 || 2011-07-21 || || Historical Milestones: (q1 milestones deleted) ||qemu-linaro 2011-04 || 2011-04-21 || 2011-04-21 || 2011-04-21 || ||qemu-linaro 2011-05 || 2011-05-19 || 2011-05-19 || n/a || ||close out 1105 blueprints || 2011-05-28 || 2011-05-28 || 2011-05-19 || ||complete 1111 planning || 2011-05-28 || 2011-05-28 || 2011-05-27 || ||qemu-linaro-2011-06 || 2011-06-16 || 2011-06-16 || 2011-06-16 || == upstream-omap3-patches * analysed omap3 patchstack and identified some initial parts to pull out * extracted and submitted upstream a 3-patch set to qdevify omap gpio * disentangled a cluster of patches for fixing and qdevifying NAND, ONENAND and the OMAP GPMC model; started on the cleanup process * spotted and fixed a bug where n810 segfaults if a key is pressed (this was already fixed in qemu-linaro but not very cleanly) == other == * submitted patch for proper implementation of prlimit64 syscall for qemu usermode * sent a patch to fix the final gcc 4.6 write-only-variable warning * patch review, etc Current qemu patch status is tracked here: https://wiki.linaro.org/PeterMaydell/QemuPatchStatus Absences: 1-5 August: Linaro sprint 1111 (maybe) 15-16 August: QEMU/KVM strand at LinuxCon NA, Vancouver [LinuxCon proper follows on 17-19th]

15 years, 4 months

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[ACTIVITY] 27th June - 1st July

by Asa Sandahl

* Got introduced to most of the team members - great! * My manager fixed a linaro laptop for med which I have installed with Natty. (This is very good since I cannot run as root on my STEricsson laptop. There are also other security restrictions that makes it very hard to work in Linaro.) * Started working a little bit with the Snowball board. I have managed to flash it using the "riff" tool. * Read through the material about SPEC2000. * I have borrowed a Panda board that I can use for the next two weeks. A question that popped up is how to get one from Linaro? * I will be on vacation 18th July - 15 August Best regards Åsa

15 years, 4 months

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No usb on omap3: 4.6 toolchain issue?

by Paolo Pisati

It all started with this: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/791552 basically, switching toolchain from 4.5 to 4.6, somehow broke usb on omap3. This morning i tested with linux-linaro-natty: [flag@newluxor linux-linaro-natty]$ git log --oneline -1 f15fd8f LINARO: Linux-linaro-2.6.38-1002.3 and i can reproduce the problem there too. Here is some more info (dmesg, toolchain, lsusb, etcetc): http://pastebin.ubuntu.com/620786/ -- bye, p.

15 years, 4 months

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[ACTIVITY] June 26-30

by Ira Rosen

Hi, - support of multiple uses of original pattern statements (needed for over-promotion work) - committed upstream - support of widen-mult of unsigned types and constants - merged to gcc-linaro-4.6 - vectorizer peeling heuristic improvement - proposed to merge to gcc-linaro-4.6 Ira

15 years, 4 months

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Fwd: [Bug gas/12931] ARM: gas fails to set the proper alignment on code sections, causing broken output

by Dave Martin

See the following commit in binutils trunk. If this is causing problems in other places, it could be worth considering for backport into the linaro tools. Cheers ---Dave http://sourceware.org/bugzilla/show_bug.cgi?id=12931 --- Comment #3 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> 2011-06-29 16:29:43 UTC --- CVSROOT: /cvs/src Module name: src Changes by: nickc(a)sourceware.org 2011-06-29 16:29:38 Modified files: gas : ChangeLog gas/config : tc-arm.c Log message: PR gas/12931 * config/tc-arm.c (mapping_state): When changing to ARM or THUMB state set the minimum required alignment of the section. Patches: http://sourceware.org/cgi-bin/cvsweb.cgi/src/gas/ChangeLog.diff?cvsroot=src… http://sourceware.org/cgi-bin/cvsweb.cgi/src/gas/config/tc-arm.c.diff?cvsro…

15 years, 4 months

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iDCT implementation in GCC NEON intrinsics, for your perusal

by Michael K. Edwards

Here's an implementation of an 8x8 integer DCT done with NEON intrinsics -- essentially a translation of the assembly version in libjpeg-turbo trunk: https://github.com/mkedwards/crosstool-ng/blob/master/patches/libjpeg-turbo… It is in a compilable (on Linaro 2011.05 GCC 4.5, anyway; a recent Linaro 4.6 snapshot ICEs) but otherwise untested state. Still, it's interesting to compare the assembly that it generates against the hand-written version. I thought I'd give linaro-toolchain a heads-up in case y'all could use a test case that generates plenty of pressure on the VFP/NEON register bank. (I intend to use it to see how much performance difference there really is, on the A8 and A9, between NEON code compiled for 16 vs. 32 registers.) Cheers, - Michael

15 years, 4 months

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Added an ARMv5E board

by Michael Hope

I've added a pico-SAM9G45 board to my home office setup. It's called libra1 and runs Debian 6.0. The nice thing about this board is it has 256 MB of RAM and should be able to run SPEC 2000. I'll start using it to check that our GCC changes don't cause significant performance regressions on earlier architectures. Dave, you could use it to test the 64 bit primitives if you want. There's more information on the configuration at: http://bazaar.launchpad.net/~michaelh1/+junk/hardware/view/head:/libra/r1/R… -- Michael

15 years, 4 months

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GCC cross compilation help: [cannot compute suffix of object files]

by mins.lin＠globalunichip.com

Hello, I tried to build the gcc-linaro cross compiler tool on the x86_64 ubuntu-10.04 machine. The build and host machine is the x86_64 ubuntu-10.04, the target is arm-eabi. But failed and got the following error messages: ----- checking host system type... arm-unknown-eabi checking for arm-eabi-ar... arm-eabi-ar checking for arm-eabi-lipo... arm-eabi-lipo checking for arm-eabi-nm... /home/minslin/ET0001A/build-gcc/./gcc/nm checking for arm-eabi-ranlib... arm-eabi-ranlib checking for arm-eabi-strip... arm-eabi-strip checking whether ln -s works... yes checking for arm-eabi-gcc... /home/minslin/ET0001A/build-gcc/./gcc/xgcc -B/home/minslin/ET0001A/build-gcc/./gcc/ -B/home/minslin/linaro-gcc/arm-eabi/bin/ -B/home/minslin/linaro-gcc/arm-eabi/lib/ -isystem /home/minslin/linaro-gcc/arm-eabi/include -isystem /home/minslin/linaro-gcc/arm-eabi/sys-include checking for suffix of object files... configure: error: in `/home/minslin/ET0001A/build-gcc/arm-eabi/libgcc': configure: error: cannot compute suffix of object files: cannot compile See `config.log' for more details. make[1]: *** [configure-target-libgcc] Error 1 make[1]: Leaving directory `/home/minslin/ET0001A/build-gcc' make: *** [all] Error 2 ----- The configure options I used were: ----- ../gcc-linaro-4.5-2011.06-0/configure --target=arm-eabi --enable-languages=c,c++ --enable-shared --prefix=/home/minslin/linaro-gcc --with-gmp=/home/minslin/gmp --with-mpfr=/home/minslin/mpfr --with-mpc=/home/minslin/mpc ----- I downloaded and built the GMP, MPFR and MPC packages. The versions I used are: gmp-5.0.2 mpfr-3.0.1 mpc-0.8.2 Please help me solving this problem. Thanks. Best regards, ------------------------------------------------------------ Min-Shong Lin (林敏雄) Engineering Division Global UniChip Corp. (創意電子) EMAIL : mins.lin(a)globalunichip.com TEL : +886-3-5646600 ext. 6937 --------------------------------- Email Confidentiality Notice ------------------------------------------ If you are not the intended recipient for this CONFIDENTIAL E-mail, please delete it immediately without keeping or distributing any copy and notify the sender. ----------------------------------------------------------------------------------------------------------------------

15 years, 4 months

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[ACTIVITY] 20th - 24th June

by Andrew Stubbs

Continued work on widening multiplies. Finally got a point where I have something I'm happy to post upstream! Posted here: http://www.mail-archive.com/gcc-patches@gcc.gnu.org/msg08720.html Richard Guenther reviewed one of the patches, and found a flaw, so I've been working on addresssing that. Booked hotel for August sprint. ---- Upstream patched requiring review: * NEON scheduling patch http://gcc.gnu.org/ml/gcc-patches/2011-02/msg01431.html * Widening Multiplies 1/7 http://www.mail-archive.com/gcc-patches@gcc.gnu.org/msg08721.html * Widening Multiplies 2/7 http://www.mail-archive.com/gcc-patches@gcc.gnu.org/msg08723.html * Widening Multiplies 3/7 http://www.mail-archive.com/gcc-patches@gcc.gnu.org/msg08724.html * Widening Multiplies 4/7 http://www.mail-archive.com/gcc-patches@gcc.gnu.org/msg08725.html * Widening Multiplies 5/7 http://www.mail-archive.com/gcc-patches@gcc.gnu.org/msg08726.html * Widening Multiplies 6/7 http://www.mail-archive.com/gcc-patches@gcc.gnu.org/msg08727.html * Widening Multiplies 7/7 http://www.mail-archive.com/gcc-patches@gcc.gnu.org/msg08728.html

15 years, 4 months

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[ACTIVITY] 2011-06-24

by David Gilbert

== Atomics == * Testing the libgcc fallback code with Nicholas's kernel patch - and then fixing my initialisation code to use init_array's (thanks Richard for the hint) * Tidying stuff up after a review of my patch by Richard - the sync.md is now smaller than the original before I started. * Discussing sync semantics with Michael Edwards - he's spotted that the gcc ARM sync routines need to move their final memory barrier for the compare-exchange case where the compare fails. * Looking at valgrind; it looks like it should be OK with the commpage changes; but it doesn't currently support ldrexd and strexd; there is a patch for it to do ARM mode but not thumb yet. Dave

15 years, 4 months

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[ACTIVITY] Weekly status

by Richard Sandiford

== This week == * Catching up on email. * More experiementation with the auto inc/dec stuff. TBH, this has taken longer than expected, but I think it's close now. * Wrote a dejagnu testcase for PR 49196. Tested it on trunk and submitted it upstream. == Next week == * Backport fix for PR 49196. * Look at NEON reload failure. * More auto inc/dec. Richard

15 years, 4 months

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[ACTIVITY] report week 24

by Peter Maydell

RAG: Red: Amber: Green: Current Milestones: || || Planned || Estimate || Actual || ||qemu-linaro-2011-07 || 2011-07-21 || 2011-07-21 || || Historical Milestones: ||finish qemu-cont-integn || 2011-01-25 || 2011-01-25 || handed off || ||first qemu-linaro release || 2011-02-08 || 2011-02-08 || 2011-02-08 || ||qemu-linaro 2011-03 || 2011-03-08 || 2011-03-08 || 2011-03-08 || ||qemu-linaro 2011-04 || 2011-04-21 || 2011-04-21 || 2011-04-21 || ||qemu-linaro 2011-05 || 2011-05-19 || 2011-05-19 || n/a || ||close out 1105 blueprints || 2011-05-28 || 2011-05-28 || 2011-05-19 || ||complete 1111 planning || 2011-05-28 || 2011-05-28 || 2011-05-27 || ||qemu-linaro-2011-06 || 2011-06-16 || 2011-06-16 || 2011-06-16 || == other == * wrote a number of patches fixing issues identified by exhaustive testing of the ARM decoder. Still some parts of the Thumb decoder to deal with. * discussion about 1176 (somebody has some patches to add support for it) and what set of feature switches are needed to support this and the 1136r1 (they have most but not all of the v6K feature set) * sent some patches which deal with the "VLDM/VSTM generate too many TCG ops" bug by raising the limit on number of TCG ops * sent a pull request for some ARM patches that had been languishing on the mailing list * tracked down a regression making vexpress crash when run on upstream QEMU to a recent Xen-related patch * working on AFDS (annual review) paperwork Meetings: toolchain, standup Lots of interrupts/bugfixing/review recently means I'm drifting slightly behind schedule on blueprints. Need to refocus on those next week. Current qemu patch status is tracked here: https://wiki.linaro.org/PeterMaydell/QemuPatchStatus Absences: 1-5 August: Linaro sprint 1111 (maybe) 15-16 August: QEMU/KVM strand at LinuxCon NA, Vancouver [LinuxCon proper follows on 17-19th]

15 years, 4 months

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[ACTIVITY] Jun 20 - Jun 24

by Ulrich Weigand

== GDB == * Completed setup and baseline run for remote gdb testsuite. This involved tracking down and working around a variety of problems including: - issues with the cross-compiler packages - board files and sysroot for the debugger to use - timing problems in the dejagnu harness - multiple problems in the GDB testsuite itself At this point, I'm down to about a dozen extra FAILs and about 2000 tests (out of 16000) tests that are not executed in the remote testsuite for one reason or the other. Next step will be to analyze those and create bug reports. Mit freundlichen Gruessen / Best Regards Ulrich Weigand -- Dr. Ulrich Weigand | Phone: +49-7031/16-3727 STSM, GNU compiler and toolchain for Linux on System z and Cell/B.E. IBM Deutschland Research & Development GmbH Vorsitzender des Aufsichtsrats: Martin Jetter | Geschäftsführung: Dirk Wittkopp Sitz der Gesellschaft: Böblingen | Registergericht: Amtsgericht Stuttgart, HRB 243294

15 years, 4 months

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[ACTIVITY] June 19-23

by Ira Rosen

Hi, - investigating detection of general over-widening cases in the vectorizer - improvements of widen-mult - proposed for merge to gcc-linaro-4.6 - fixed PRs 49443 and 49478 Ira

15 years, 4 months

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[ACTIVITY] weekly status

by Ken Werner

Hi, * in order to have the android's debuggerd use libunwind I looked at libunwind's remote interface and especially the libunwind-ptrace lib that sits on top of that. * the remote interface seems a bit awkward to me. The user provides a set of callbacks to access the inferior memory or registers. Instead of using these callbacks to obtain the actual unwind information (eh_frame fro example) it requires the user implement another callback (find_proc_info) to lookup the unwind info himself. * the libunwind-ptrace currently deos not support the ARM specific unwind tables * started to look into how to improve the situation * not straight forward as it's tightly bound to eh_frame unw info and libunwinds DWARF parsing mechanism * attending a class this afternoon * Note: I'm on vacation starting in a few hours and I'll be back on Tuesday next week. Regards Ken

15 years, 4 months

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