linaro-toolchain

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Linaro GCC 4.5 2010-11 released

by Michael Hope

The Linaro Toolchain Working Group is pleased to announce the latest release of Linaro GCC 4.5. Linaro GCC 4.5 is the fourth release in the 4.5 series. Based off the latest GCC 4.5.1+svn164911, it includes many ARM-focused performance improvements and bug fixes. Interesting changes include: * Various NEON related fixes * Performance improvements * A clean up of some of the testsuite test cases * An updated version of the __sync multicore primitives * Improvements in data packing when optimising for size * C locale support in libstdc++-v3 This release adds the new option -fstrict-volatile-bitfields and enables it by default on ARM. See doc/invoke.texi for more information. The source tarball is available from: https://launchpad.net/gcc-linaro/+milestone/4.5-2010.11-0 Downloads are available from the Linaro GCC page on Launchpad: https://launchpad.net/gcc-linaro Note that there were no changes to the 4.4 series. -- Michael

15 years

Linaro GDB 7.2 2010.11-0 released

by Michael Hope

The Linaro Toolchain Working Group is pleased to announce the release of Linaro GDB 7.2. Linaro GDB 7.2 2010.11-0 is the second release in the 7.2 series. Based off the latest GDB 7.2, it includes a number of ARM-focused bug fixes and enhancements. This release concentrates on the GDB test suite and tidies up a number of failures. The source tarball is available at: https://launchpad.net/gdb-linaro/+milestone/7.2-2010.11-0 More information on Linaro GDB is available at: https://launchpad.net/gdb-linaro -- Michael

15 years

Auto-detection of vector size for NEON

by Ira Rosen

Hi, It looks like it's enough to implement targetm.vectorize. autovectorize_vector_sizes for NEON in order to enable initial auto-detection of vector size. With the attached patch and -mvectorize-with-neon-quad flag, the vectorizer first tries to vectorize for 128 bit, and if this fails, it tries to vectorize for 64 bit. For example, in the attached testcase number of iterations is too small for 128 bit (first 2 iterations have to be peeled in order to align the array accesses), but is sufficient for 64 bit (the accesses are aligned here). I'd appreciate your comments on the patch, and I also have a few questions: 1. Why the default vector size is 64? 2. Where is the place of NEON vectorization tests? I found NEON tests with intrinsics at gcc.target/arm, is that the right place? 3. According to gcc.dg/vect/vect.exp the only flag that is used for NEON (in addition to target independent flags) is -ffast-math. Is that enough? Thanks, Ira ChangeLog: * config/arm/arm.c (arm_autovectorize_vector_sizes): New function. (TARGET_VECTORIZE_AUTOVECTORIZE_VECTOR_SIZES): Define. Index: config/arm/arm.c =================================================================== --- config/arm/arm.c (revision 166032) +++ config/arm/arm.c (working copy) @@ -246,6 +246,7 @@ static bool arm_builtin_support_vector_misalignmen const_tree type, int misalignment, bool is_packed); +static unsigned int arm_autovectorize_vector_sizes (void); /* Table of machine attributes. */ @@ -391,6 +392,9 @@ static const struct default_options arm_option_opt #define TARGET_VECTOR_MODE_SUPPORTED_P arm_vector_mode_supported_p #undef TARGET_VECTORIZE_PREFERRED_SIMD_MODE #define TARGET_VECTORIZE_PREFERRED_SIMD_MODE arm_preferred_simd_mode +#undef TARGET_VECTORIZE_AUTOVECTORIZE_VECTOR_SIZES +#define TARGET_VECTORIZE_AUTOVECTORIZE_VECTOR_SIZES \ + arm_autovectorize_vector_sizes #undef TARGET_MACHINE_DEPENDENT_REORG #define TARGET_MACHINE_DEPENDENT_REORG arm_reorg @@ -23223,6 +23227,12 @@ arm_expand_sync (enum machine_mode mode, } } +static unsigned int +arm_autovectorize_vector_sizes (void) +{ + return TARGET_NEON_VECTORIZE_QUAD ? 16 | 8 : 0; +} + static bool arm_vector_alignment_reachable (const_tree type, bool is_packed) { test: #define N 5 unsigned int ub[N+2] = {1,1,6,39,12,18,14}; unsigned int uc[N+2] = {2,3,4,11,6,7,1}; void main1 () { int i; unsigned int udiff = 2; unsigned int umax = 10; for (i = 0; i < N; i++) { /* Summation. */ udiff += (ub[i+2] - uc[i]); /* Maximum. */ umax = umax < uc[i+2] ? uc[i+2] : umax; } }

15 years

Weekly meeting at 0900 UTC today

by Michael Hope

Hi there. Just a reminder that today's call is the first at the new time of 0900 UTC which is 9am in the UK, 10am in Germany, 11am in Israel, and 5pm in China. I've updated the meetings page at: https://wiki.linaro.org/WorkingGroups/ToolChain/Meetings with the new details. -- Michael

15 years

Help on merging two patches

by Yao Qi

Hi, I am backporint some patches from FSF mainline, which may improve Linaro 4.5 gcc on thumb2 speed. The first one is done by Richard E. "Improve optimization to transform TST into LSLS" http://gcc.gnu.org/ml/gcc-patches/2010-06/msg02518.html After it applied to Linaro 4.5 tree, EEMBC speed number downgrades, while code size is reduced to some extent. The code difference is like this, 6801 ldr r1, [r0, #0] f831 3013 ldrh.w r3, [r1, r3, lsl #1] -f413 6f00 tst.w r3, #2048 ; 0x800 -f43f af41 beq.w cc <t_run_test+0xcc> +0518 lsls r0, r3, #20 +f57f af44 bpl.w cc <t_run_test+0xcc> 4610 mov r0, r2 After reading cortex-a8 TRM, I can't find exact timing cycles of lsls. Under Chung-Lin's help, we feel that lsls should be slower than tst, but don't have any evidence to prove. If any people is familiar with arm microarch, help is welcome. If our assumption is correct, we may can change this patch to an optimization specific to size only. The second patch is Bernd's "Fix an if statement in arm_rtx_costs_1" http://gcc.gnu.org/ml/gcc-patches/2010-07/msg02096.html After this patch applied, EEMBC benchmark number is not changed. Shall we merge this patch to linaro 4.5 tree? I am inclined to merge it, but if you have concerns on this patch, let us discuss here. -- Yao Qi CodeSourcery yao(a)codesourcery.com (650) 331-3385 x739

15 years

Problems with BeagleBoard installation

by Ira Rosen

Hi, I am trying to install my new BeagleBoard xM. I started with https://wiki.linaro.org/Releases/DailyBuilds, but it failed to write to the SD card giving some errors about QEMU (I can try that again if the error messages are important). Dave Martin also gave me this link https://wiki.linaro.org/Source/ImageInstallation, but it doesn't exist anymore. So, I tried these instructions: https://wiki.linaro.org/Source/VexpressImageInstallation with http://snapshots.linaro.org/10.11-daily/linaro-headless/20101107/0/images/t… http://jameswestby.net:8080/view/Hardware%20Packs/job/linaro-omap3%20hwpack… --dev beagle). The installation of the SD card went ok, but the board doesn't work. During boot I see the printings as in the attached file and it doesn't go any further. I hope someone can help me with that, because otherwise I am at dead end... Thanks, Ira

15 years

Changing meetings

by Michael Hope

Hi there. I plan to change the Toolchain WG meetings due to daylight savings and to better cover the US. The Monday meeting will be at 0900 UTC which is 9 am in the UK, 10 am in central Europe, and 5 pm in Beijing. The standup calls will be merged into one at 1800 UTC on Wednesday which is 6 pm in the UK, 7 pm in central Europe, and 1 pm on the US East Coast. I don't expect China to call in as it's a quite unreasonable time. I'll update the invites and wiki page to reflect this. We'll start the new times next week, so Monday the 8th will be the first meeting at the new time. -- Michael

15 years, 1 month

Links

by Michael Hope

This is more for the people in the sprint... http://ex.seabright.co.nz/helpers/blueprints#toolchain http://ex.seabright.co.nz/helpers/planner -- Michael

15 years, 1 month

Report of thumb2 tuning investigation

by Yao Qi

The gaol and plan of investigation has been described in [1] In the plan, this task is divided into three parts, 1) patch backport, 2) regression fix, and 3) exploration and study other ARM compilers. This report follow the same manner. 1. Patch backport. 8 patches are listed in [1]. Backport them to Linaro 4.5 tree will improve speed performance. Action/Recommendation: Backport them if speed improves. These patches are ones that I think they *should* improve speed, but "performance surprise" is not impossible. 2. Regression fix. So far (until r99399), Linaro GCC 4.5 is slower than FSF GCC 4.5.0 on some EEMBC benchmarks. Performance regression is introduced by four commits, r99324,r99330,r99369,r99380, see details in [2]. Action/Recommendation: Figure out why speed regression is introduced, and try to fix it. One cent here is that how to avoid speed regression. I do believe that sometimes regression is unavoidable, but it is better if can track them, and keep them manageable. 3. Exploration and study other ARM compilers. In this part, I don't find any possible thumb-2 specific improvements. However, loop optimization and instruction scheduling should be improved on ARM. (This statement may be true to all ports, or even all compilers) Some tickets are opened for this part, LP:660644 Missed optimization opportunities LP:662692 Inner loop in autcor00 can be optimized better LP:656957 LP:645267 Improve code generation on switch statement LP:663793 Tune Swing Modulo Scheduling or Selective Scheduling for ARM LP:656373 Try -fsched-pressure for ARM I have to admit that instruction scheduling is quite hard, but if we can do something here, that will be great. I've put it in "performance-insdie-gcc" session on UDS. Let us talk about it a little there next week. During this investigation, I also find LTO or "whole-program optimization" is useful to some EEMBC benchmarks. (I didn't run LTO/WPO at all, but I got this when read source of benchmarks) [1] Plan of CS304: Thumb2 tuning investigation. http://lists.linaro.org/pipermail/linaro-toolchain/2010-October/000300.html [2] https://wiki.linaro.org/YaoQi/Sandbox/Thumb2SpeedOptimization -- Yao Qi CodeSourcery yao(a)codesourcery.com (650) 331-3385 x739

15 years, 1 month

finding in 4.5.2 20101003 (Linaro) [release 4.5-2010.10-0]

by leonid.moiseichuk＠nokia.com

Hello, Sorry I cannot find a bugzilla. One issue detected during compilation of ffmpeg, it looks like gcc -DHAVE_AV_CONFIG_H -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -I. -I"/home/ldm/misc/tc/suite/cases/ffmpeg/ffmpeg" -O3 -D_ISOC99_SOURCE -D_POSIX_C_SOURCE=200112 -std=c99 -fomit-frame-pointer -Wdeclaration-after-statement -Wall -Wno-switch -Wdisabled-optimization -Wpointer-arith -Wredundant-decls -Wno-pointer-sign -Wcast-qual -Wwrite-strings -Wtype-limits -Wundef -fno-math-errno -fno-signed-zeros -c -o libavcodec/dsputil.o libavcodec/dsputil.c /tmp/ccK6jdSP.s: Assembler messages: /tmp/ccK6jdSP.s:34764: Error: VFP/Neon double precision register expected -- `vmovl.s16 q3,s12' /tmp/ccK6jdSP.s:34781: Error: VFP/Neon double precision register expected -- `vmovl.s16 q2,s8' /tmp/ccK6jdSP.s:34798: Error: VFP/Neon double precision register expected -- `vmovl.s16 q1,s4' /tmp/ccK6jdSP.s:34800: Error: VFP/Neon double precision register expected -- `vmovl.s16 q0,s0' /tmp/ccK6jdSP.s:34820: Error: VFP/Neon double precision register expected -- `vmovl.s16 q8,s8' The sources, assembler and test case are attached. With best wishes, Leonid

15 years, 1 month

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