linaro-toolchain

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[ANNOUNCE] Linaro QEMU 2012.04 released

by Peter Maydell

The Linaro Toolchain Working Group is pleased to announce the release of Linaro QEMU 2012.04. Linaro QEMU 2012.04 is the latest monthly release of qemu-linaro. Based off upstream (trunk) QEMU, it includes a number of ARM-focused bug fixes and enhancements. New in this month's release: - ppoll syscall now supported in ARM linux-user mode - the SETEND instruction in the Thumb encoding now UNDEFs to match behaviour for the ARM encoding - the OMAP36xx UART FIFO status registers are now implemented (thanks to Jan Vesely) Known issues: - Graphics do not work for OMAP3 based models (beagle, overo) with 11.10 Linaro images. - Audio may not work on Versatile Express models with the latest Linaro kernel/hardware packs (LP:977610). The source tarball is available at: https://launchpad.net/qemu-linaro/+milestone/2012.03 More information on Linaro QEMU is available at: https://launchpad.net/qemu-linaro

14 years, 2 months

[ANNOUNCE] Linaro GCC 4.7 and 4.6 2012.04 released

by Michael Hope

The Linaro Toolchain Working Group is pleased to announce the 2012.04 release of both Linaro GCC 4.7 and Linaro GCC 4.6. Linaro GCC 4.7 2012.04 is the first release in the 4.7 series. Based off the latest GCC 4.7.0+svn186061 release, it includes performance improvements especially around 64 bit operations. Interesting changes include: * Our first 4.7 based release * Updates to GCC 4.7.0+svn186061 * Better use of 16 bit Thumb-2 instructions for smaller code size * Implements 64 bit ones complement in NEON * Adds support for the ARMv6 saturation instructions * Backports the NEON lexer improvements for faster compilation * Backports the 64 bit multiply, divide, and mod improvements Fixes: * LP: #960283 slp pass assert when compiler configure with --enable-checking Linaro GCC 4.6 2012.04 is the fourteenth release in the 4.6 series. Based off the latest GCC 4.6.3+svn186060 release, this is the first release after entering maintenance. Interesting changes include: * Updates to 4.6.3+svn186060 Fixes: * LP: #960283 slp pass assert when compiler configure with --enable-checking The source tarballs are available from: https://launchpad.net/gcc-linaro/+milestone/4.7-2012.04 https://launchpad.net/gcc-linaro/+milestone/4.6-2012.04 Downloads are available from the Linaro GCC page on Launchpad: https://launchpad.net/gcc-linaro More information on the features and issues are available from the release page: https://launchpad.net/gcc-linaro/4.7/4.7-2012.04 Mailing list: http://lists.linaro.org/mailman/listinfo/linaro-toolchain Bugs: https://bugs.launchpad.net/gcc-linaro/ Questions? https://ask.linaro.org/ Interested in commercial support? Inquire at support(a)linaro.org -- Michael

14 years, 2 months

O2 optimization with vectorize

by Singh, Ravi Kumar (Ravi)

All, In the below code, I tried few compiler options and got following observations: 1) arm-linux-gnueabi-gcc -O2 -mcpu=cortex-a15 -mfpu=neon -ftree-vectorizer-verbose=6 -ftree-vectorize Compiler throws following info messages: foo.c:16: note: not vectorized: unsupported use in stmt. foo.c:16: note: not vectorized: unsupported use in stmt. foo.c:18: note: not vectorized: unsupported use in stmt. foo.c:18: note: not vectorized: unsupported use in stmt. 2) -O2 -mcpu=cortex-a15 -mfpu=neon None of the generated code contains the NEON instructions. Code generated with case 1 is taking 3000 cycles, and code generated by option 2 is taking 2500 cycles. Even if vectorization failed in case1, it should not generate more inefficient code than case 2. My belief was that the executables from both would take same cycles, any thing done for doing unsuccessful vectorization must be reverted if it did not succeed. ################################################################### #define SIZE1 20 #define SIZE2 26 unsigned int array[SIZE1][SIZE2]; void foo() { unsigned int i,j; unsigned int max = 0; for(i = 0; i < SIZE1; i++) { for(j = 0; j < SIZE2; j++) { if (array[i][j] > max) { max = array[i][j]; index = j; } } } printf("Max value: %u Index: %u\n", max, index); } Regards RKS

14 years, 2 months

2012.04 release prep

by Michael Hope

Hi there. The 2012.04 toolchain release is this week. Ulrich, I see your fix for LP: #968766 has been approved upstream. In theory it's too late but I'm happy to land it if you are. Could you decide and let Andrew know by the middle of Tuesday? Andrew, if you don't hear from Ulrich then spin away. Andrew, could you run the release process on Tuesday please? There's one extra step this month: once you've uploaded and spawned the job, go to the scheduler screen and click on 'Release' beside each of the ursas. I reserved them to make sure they'd be idle and ready to pick up the release build when ready. Thiago, let us know if Ulrich or I can lend a hand with the GDB release. -- Michael

14 years, 2 months

Changing the time of the fortnightly performance call

by Ramana Radhakrishnan

Hi there, At the last call Michael asked if we could push this call back by 30 minutes given the changes due to daylight savings. Does anyone have any objections to a new time of 10 a.m. BST - 11 a.m. Central European - 9 p.m. New Zealand. ? cheers Ramana

14 years, 2 months

[ACTIVITY] 2nd - 5th April

by Andrew Stubbs

* GCC Identified the latent bug that's upset my NEON-shifts testing. It turns out the define-insn-and-shift patterns in arm/sync.md have no length attributes set. Now that the NEON 64-bit shifts appear to be not broken, I've relaunched the 64-bit extend testing. Identified the problem with my NEON-64-bit-negate patch: I already knew it works better (produces more optimal code) with my NEON-immediates patch, but it turns out that at -O0 the other patch is a hard requirement or else bad things happen in output_move_vfp. Backported Ramana's patch for ARM-mode testing of my recent Thumb 64-bit test cases. I've applied it to Linaro GCC directly, without a merge proposal, as it's a very low-risk patch. Caught up with some launchpad blueprint fiddling. Completed the merges from 4.6 and 4.7 FSF. The 4.7 merge was tricky as it required working around a BZR bug; I've posted the workaround to the toolchain list. * Other On leave on Tuesday Public holiday on Friday. Attached a copy of the ARM Linux ABI document to KBentry 39 so we're hosting it somewhere, at least. Posted an internal Mentor/CS question about getting its old home restored, and getting a relicensed edition to allow others to use it as the basis for a hard-float equivalent.

14 years, 2 months

[Activity] Week 14

by Ramana Radhakrishnan

=== Progress === * Worked on VFP addressing patch and corrected the failures. * Got SPEC2k up and running with hot cold partitioning. Some SEGVs that need investigation. In general results appear to be better in quite a few cases. * Investigated an issue with a merge request for upstream 4.7 branch into our tree. There was a testsuite failure and I wasn't able to reproduce it with a local i386 rebuild of the toolchain. Therefore we'll have to let this go in. == Plans == * I will be away for 2 days this week attending the LLVM conference in London. * Pursue backporting gnu_unique_object upstream. * Finish off the VFP addressing modes patch upstream. * Look at some of the existing blueprints and start discussions around prioritizing this. * Investigate some of the SEGVs with h-c partitioning. Absences. * Apr 12-13 : Euro-LLVM London. * Linaro Connect Q2.12 - May 28 - June 1 -

14 years, 2 months

[Activity] Week 14

by Zhenqiang Chen

Summary: * Revise the patch for relocatable NLS support. * Code size benchmark analysis. Details: 1. Revise the patch for relocatable NLS support: lp:918926. * Read the gcc configure and makefile. * It seams hard to get the relative dir if the gcc is configured with --bindir=... --datadir/datarootdir. E.g. --bindir=/opt/bin --datarootdir=/tmp/data 2. Code size benchmark analysis with -Os * Investigate regression in small cases. 3. Try to build linaro gcc trunk with crosstool-ng. But it reports error when configuring libquadmath. * configure:9829: error: Link tests are not allowed after GCC_NO_EXECUTABLES. * Manual check or a simple case show libc.so can be linked. Plans: * Tuning optimization heuristics for -Os Planed leaves: * April 9 - 11: Vacations Best regards! -Zhenqiang

14 years, 3 months

[ACTIVITY] report week 14

by Peter Maydell

Current Milestones: || || Planned || Estimate || Actual || ||cp15-rework || 2012-01-06 || 2012-04-10 || || Historical Milestones: ||initial-a15-system-model || 2012-01-27 || 2012-01-27 || 2012-01-17 || ||qemu-kvm-getting-started || 2012-03-04?|| 2012-03-04?|| 2012-02-01 || == other == * LP:970252 got a beagle board booting so I could read the UART version register; reviewed and applied to qemu-linaro the set of patches provided by Jan Vesely (thanks!) * sent a patchset cleaning up the GIC model so it is a self-contained sysbus device; this should make it easier to just drop in a functionally equivalent device which is a shim for an in-kernel GIC model that uses the hardware VGIC features * upstream review: save/load support for sd.c [patchset from Samsung] SPI bus [patchset from Petalogix] * put together qemu-linaro prerelease tarball and did some testing * performance evaluation finished and submitted

14 years, 3 months

[ACTIVITY] 26th - 30th March

by Andrew Stubbs

Continued work on neon 64-bit correctness. This is really dragging out now. I had hoped to have had it fixed by now, but subtle bugs are subtle. The 16-bit opcodes patch is now committed both upstream and in Linaro GCC 4.7, however, so that's some progress at least. Posted benchmark results for the the 64-bit shifts in core registers. The results are inconclusive: the benchmark runs are too noisy.

14 years, 3 months

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