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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

14 years, 2 months

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

14 years, 2 months

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. ----------------------------------------------------------------------------------------------------------------------

14 years, 2 months

[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

14 years, 2 months

[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

14 years, 2 months

[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

14 years, 2 months

[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]

14 years, 2 months

[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

14 years, 2 months

[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

14 years, 2 months

[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

14 years, 2 months

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