linaro-toolchain

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9 participants
5786 discussions

by Andrew Stubbs

Posted a patch upstream to fix big-endian for generic tuning. This was a simple omission from my previous patches. Merged GCC 4.6.2 to Linaro GCC. It's still in testing now, so I'll have to commit it sometime over the weekend or next week. Looked at the benchmark results from Spec2000 running on both A8 and A9 systems, with and with NEON, and with various compiler options. Posted the results in a spreadsheet (visible within Linaro only). Begun making adjustments to generic tuning and started new spec2k runs to see if they are beneficial. First, I'm trying A9 prefetch settings on A8 to see how much damage it does. Next I'll try enabling the A8 NEON tuning settings on A9 to see what happens there. Prepared for travel next week. Vacation Friday

14 years, 10 months

[ACTIVITY] October 23-27

by Ira Rosen

Hi, - Merged to gcc-linaro: - widening shifts - SLP features: support loads with different offsets and swap operands if necessary - Started rewriting SLP analysis to support operations with more than two operands (towards SLP of conditions) - Updated NEON presentation following Ramana's suggestions (thanks!) - Suggested to Ramana to implement vcond with mixed types, created a blueprint: https://blueprints.launchpad.net/gcc-linaro/+spec/vcond-with-mixed-types - Vectorizer: - updated vectorizer's webpage - updated vectorizer's wiki page - the usual maintenance - Committed upstream two SLP data-ref analysis improvements: PR 50730 and PR 50819 Ira

14 years, 10 months

Toolchain Connect sessions

by Michael Hope

Hi there. Connect is just around the corner. Have a look at: https://wiki.linaro.org/MichaelHope/Sandbox/Q4.11Plans for a summary of the toolchain sessions and hacking topics. It would be great to have kernel and OCTO input in the ARM STM driver, Kernel debugging, and KVM sessions. -- Michael

14 years, 10 months

Toolchain performance call during connect.

by Ramana Radhakrishnan

Hi Folks, Draft agenda for the performance meeting next week at Connect - https://blueprints.launchpad.net/gcc-linaro/+spec/linaro-toolchain-performa… Are there any topics that people would like to bring up during this meeting other than the ones listed here ? I suspect that we'll probably just have about 10-15 minutes for a topic in this case. I am not considering discussing PGO related stuff in this session given that we've got another session in which we can discuss this. Thoughts ? cheers Ramana

14 years, 10 months

Performance improvements hacking time at Connect Q4.11

by Ramana Radhakrishnan

Hi Folks, I've been trying to capture what we want to do in terms of hacking time and some of the performance related backlog that we have in the system. I have done so here. https://wiki.linaro.org/RamanaRadhakrishnan/Sandbox/Q411ConnectGCCPerfPlan I'm on vacation tomorrow but should be picking email for sometime during the day. Thoughts about what else we could be doing in this area or if there's a better way we could use our hacking time. cheers Ramana ---

14 years, 10 months

Building gcc-linaro 4.6 2011.10 on ubuntu 11.10 32bit for cortex-a9

by Bruno Niklaus

hi@all i try to build the linaro-gcc on a ubuntu host 11.10 32 bit for a cortex a9. but it doenst build to the end. this is the first time ever i try to build a toolchain on my own, so excuse me if its just a beginner-mistake. somebody has any idea? configured like this *./configure --target=arm-linux-gnueabi --disable-bootstrap --enable-languages=c,c++ --with-mode=thumb --with-arch=armv7-a --with-tune=cortex-a9 --with-fpu=neon --with-float=softfp --prefix=/home/user/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10* * * no errors when configuring, but it fails during building with this error: *checking for suffix of object files... configure: error: in `/home/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10_src/arm-linux-gnueabi/libgcc': * *configure: error: cannot compute suffix of object files: cannot compile* *See `config.log' for more details.* *make[1]: *** [configure-target-libgcc] Fehler 1* *make[1]: Verlasse Verzeichnis '/home/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10_src'* *make: *** [all] Fehler 2* when i check the ./arm-linux-gnueabi/libgcc/config.log the errors which return 1 are: *configure:3028: /home/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10_src/host-i686-pc-linux-gnu/gcc/xgcc -B/home/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10_src/host-i686-pc-linux-gnu/gcc/ -B/home/user/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10/arm-linux-gnueabi/bin/ -B/home/user/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10/arm-linux-gnueabi/lib/ -isystem /home/user/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10/arm-linux-gnueabi/include -isystem /home/user/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10/arm-linux-gnueabi/sys-include -V >&5* *xgcc: error: unrecognized option '-V'* *xgcc: fatal error: no input files* *compilation terminated.* *configure:3039: $? = 1* *configure:3028: /home/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10_src/host-i686-pc-linux-gnu/gcc/xgcc -B/home/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10_src/host-i686-pc-linux-gnu/gcc/ -B/home/user/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10/arm-linux-gnueabi/bin/ -B/home/user/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10/arm-linux-gnueabi/lib/ -isystem /home/user/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10/arm-linux-gnueabi/include -isystem /home/user/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10/arm-linux-gnueabi/sys-include -qversion >&5* *xgcc: error: unrecognized option '-qversion'* *xgcc: fatal error: no input files* *compilation terminated.* *configure:3039: $? = 1* *configure:3055: /home/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10_src/host-i686-pc-linux-gnu/gcc/xgcc -B/home/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10_src/host-i686-pc-linux-gnu/gcc/ -B/home/user/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10/arm-linux-gnueabi/bin/ -B/home/user/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10/arm-linux-gnueabi/lib/ -isystem /home/user/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10/arm-linux-gnueabi/include -isystem /home/user/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10/arm-linux-gnueabi/sys-include -o conftest -g -O2 conftest.c >&5* */home/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10_src/host-i686-pc-linux-gnu/gcc/as: line 87: exec: -m: invalid option* *exec: usage: exec [-cl] [-a name] [command [arguments ...]] [redirection ...]* *configure:3058: $? = 1* *configure:3246: checking for suffix of object files* *configure:3268: /home/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10_src/host-i686-pc-linux-gnu/gcc/xgcc -B/home/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10_src/host-i686-pc-linux-gnu/gcc/ -B/home/user/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10/arm-linux-gnueabi/bin/ -B/home/user/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10/arm-linux-gnueabi/lib/ -isystem /home/user/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10/arm-linux-gnueabi/include -isystem /home/user/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10/arm-linux-gnueabi/sys-include -c -g -O2 conftest.c >&5* */home/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10_src/host-i686-pc-linux-gnu/gcc/as: line 87: exec: -m: invalid option* *exec: usage: exec [-cl] [-a name] [command [arguments ...]] [redirection ...]* *configure:3272: $? = 1* *configure: failed program was:* *| /* confdefs.h */* *| #define PACKAGE_NAME "GNU C Runtime Library"* *| #define PACKAGE_TARNAME "libgcc"* *| #define PACKAGE_VERSION "1.0"* *| #define PACKAGE_STRING "GNU C Runtime Library 1.0"* *| #define PACKAGE_BUGREPORT ""* *| #define PACKAGE_URL "http://www.gnu.org/software/libgcc/"* *| /* end confdefs.h. */* *| * *| int* *| main ()* *| {* *| * *| ;* *| return 0;* *| }* *configure:3286: error: in `/home/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10_src/arm-linux-gnueabi/libgcc': * *configure:3289: error: cannot compute suffix of object files: cannot compile* *See `config.log' for more details.*

14 years, 10 months

ARM eglibc: adding ucontext?

by Peter Maydell

At the moment ARM eglibc doesn't support the functions declared in ucontext.h: getcontext(), setcontext(), swapcontext() and makecontext(). Instead you get implementations which always fail and set errno to ENOSYS. QEMU uses these functions to implement coroutines. Although there is a fallback implementation in terms of threads, there are reasons why using the fallback is suboptimal: * its performance is worse * it will be less tested, because x86_64 and i386 both implement the ucontext functions and so QEMU on those hosts will be using different code paths * I'm not aware of a good way at configure time to detect whether getcontext() et al will always fail without actually running a test binary, which won't work in a cross-compile setup. (If eglibc just didn't provide the functions at all this would be much simpler...) We're going to care about performance and reliability of QEMU on ARM hosts as we start to support KVM on Cortex-A15, so it would be good if we could add ucontext function support to eglibc as part of that effort. Opinions? Have I missed some good reason why there isn't an ARM implementation of these functions? (I'm aware that the ucontext functions have been removed from the latest version of the POSIX spec; however AFAIK there's no equivalent functionality that replaces them so I think they're still worth having implementations of for parity with other architectures.) -- PMM

14 years, 10 months

[Activity] Week ending 21st Oct 2011

by Ramana Radhakrishnan

==Progress=== * Some upstream patch review. * Spent time looking at LP 836588 which is a case where CSE removes a particular label access in one case but doesn't remove it from the list of things in the constant pool which is quite bizarre. Will probably need some help with looking into this one. * Sent out vcvt.f32 and vcvt.f64 patches . * Connect preparation - laptop cleanup and getting it finally onto an x86_64 distribution. * Looked at some of the vec_perm / vec_rev cases in Neon with Ira. * Spent some time looking at some of Andrew's issues with generic-v7a tuning especially the cases where it was doing better and gave some suggestions. === Plans === * Prepare for Connect. * Prepare by looking at some of the large differences between various comparative benchmarks. * Some research into PGO related stuff. * Try to upstream some more of my patches in the backlog before the end of the week. * Finish off some internal paperwork. * I'm off on 26th - Wednesday. Absences. * 26th Oct - Day off. * 31st Oct - 4th Nov - Linaro Connect Q4.11 * 08 Nov - 11 Nov - Tentatively booked * Dec 19 - 31st Dec - Tentatively booked

14 years, 10 months

[ACTIVITY] 17th - 21st October

by Andrew Stubbs

Continued looking at my constant reuse optimization. I've identified a couple of hundred optimization opportunities in the whole of gcc itself, which is fewer than I had hoped. There are almost no opportunities when compiling for size as constants are always loaded from a constant pool in that case (I'm not sure why that's the case, given that this isn't any more space efficient than movw+movt, unless it can share the constant in more than one place). Backported my -mtune=native patch to Linaro GCC. Backported my generic tuning patch to Linaro GCC. Backported my pr50717 patch to Linaro, and pushed to Launchpad for testing. Analysed my benchmark results I made to aid generic tuning. Disappointingly the A8/A9 tuning is not as beneficial as one would like. In fact, the existing generic tuning patch (which was supposed to be a framework only) is actually quite competitive and gives better performance in some cases. Set more benchmarks running, this time with NEON enabled. That's about 36 hour's worth on A9, and more like 90 hours on my A8 (obviously, there's some difference in the clock speeds there). Discovered that my native tuning code won't compile with a C++ compiler (GCC Bugzilla PR50809). Tested and committed a fix upstream.

14 years, 10 months

[ACTIVITY] weekly status

by Revital Eres

Hello, Continue the implementation of estimating register pressure in SMS. Discussed with Richard some issue raised while implementing. Revital

14 years, 10 months

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