- linaro-toolchain - lists.linaro.org

Linaro GDB 7.3 2011-09 released

by Ulrich Weigand

The Linaro Toolchain Working Group is pleased to announce the release of Linaro GDB 7.3. Linaro GDB 7.3 2011.09 is the second release in the 7.3 series. Based off the latest GDB 7.3, it includes a number of ARM-focused bug fixes and enhancements. This release contains: * Support for hardware breakpoints and watchpoints in gdbserver The source tarball is available at: https://launchpad.net/gdb-linaro/+milestone/7.3-2011.09 More information on Linaro GDB is available at: https://launchpad.net/gdb-linaro

13 years, 9 months

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Branch is open

by Michael Hope

Hi there. The 2011.09 release has been spun and is testing up well. The 4.5 and 4.6 branches are now open so feel free to commit any approved patches. -- Michael

13 years, 9 months

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arm-eabi-g++: error: unrecognized option '-avoid-version'

by Asa Sandahl

Hi! When building Android with the Linaro toolchain, I encountered this link time error when going from gcc 4.4.3 to gcc 4.6. "arm-eabi-g++: error: unrecognized option '-avoid-version'" I find several posts about people encountering the same thing for different programs. Was this option removed? Anyone know the story behind it? Regards Åsa

13 years, 9 months

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Blueprints, Headline and Acceptance criteria for monthly releases

by Mounir Bsaibes

Release Management needs the list of the the blueprints that will be delivered this month. For each bp, they want a Headline and Acceptance criteria. The Headline is a statement to include in the Monthly release announcement. The acceptance criteria is a statement how to verify the work is done. I have collected this month's blueprints in the spreadsheet, please review it for accuracy. If a blueprint you are working on is missing, please add it. The Headline and Acceptance can be added into the whiteboard as follows: Headline: headline text Acceptance: acceptance text Once you add the the headline and acceptance, please modify the spreadsheet to reflect that it is done. https://docs.google.com/a/linaro.org/spreadsheet/ccc?key=0AoZqvK7R1biJdGxSc… Thanks in advance, Mounir -- Mounir Bsaibes Project Manager Follow Linaro.org: facebook.com/pages/Linaro/155974581091106 http://twitter.com/#!/linaroorg http://www.linaro.org/linaro-blog <http://www.linaro.org/linaro-blog>

13 years, 9 months

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[Activity] Weekly report for w/e 2011-09-09

by Ramana Radhakrishnan

==GCC== ===Progress=== * Fixed https://bugs.launchpad.net/ubuntu/+source/gcc-4.6/+bug/838994 . Investigated Bernd's alternate patch . Will commit mine. * Looked at PR48308 for sometime whihc might be a dup of PR50313 . * Some blueprint foo. * Committed a few of the outstanding approved patches into Linaro GCC-4.6 * Patch review week * Caught up with email after vacation. === Plans === * Commit conditional compares patch. * Commit the patch for LP838994. * Investigate some of the performance issues with strlen and some of the cases with - one of the ideas is to probably try and get the specific testcases run under u-boot or as a bare-metal binary and look at dumps of various performance monitoring counters and see what's happening. * Look at BRANCH_COST and finish that up next. * Dust off patch for PR19599 . One of them them that has fallen into the cracks. * Some patch review. Meetings: * 1-1s * TCWG calls * Thumb2 performance call. Absences. * 16th Oct (pm) - LLVM developer summit - London * 31st Oct - 4th Nov - Linaro Summit Orlando - Travel booked - hotel to be booked. * 08 Nov - 11 Nov - Tentatively booked not approved. * Dec 19 - 31st Dec - Tentatively booked not approved.

13 years, 9 months

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[ACTIVITY] 5th - 11th September

by Andrew Stubbs

Merged both GCC 4.5 and 4.6 from FSF to Linaro. Matthias requested that I avoid a particular upstream 4.6 commit, so I selected the revision before that as the merge point. The problem was then fixes upstream, and another fix was desirable, so I've redone the merge from the branch head. Another widening-multiplies bug was reported to me (I logged it as pr50318/lp843775), so I've fixed that and committed the fix upstream, and filed a merge request on Launchpad. Finished fixing the bugs in my thumb2 constants optimizations, and backported the new patches to Linaro GCC 4.6. Pushed the updated stuff to Launchpad for testing. Richard Sandiford found a flaw in my patch for pr50193/lp836401, so I've done another version of that and posted it upstream. Ramana didn't like that version. I've started again trying to fix it a different way, but I don't have it working just yet. Continued work on my new constant reuse patch. I have it detecting many constant expressions, and calculating the values for some of them. Once it does that sufficiently well, the next step is to track what constants are available where, I then I'll be in a position to find optimization opportunities. At the moment, 'sufficiently well' could just mean MOVW/MOVT pairs, as those are the most common Tried to get the CS Panda Boards up and running again after the move. No success. Ricardo is on the case. I'm still using the boards located at Canonical. Andrew

13 years, 9 months

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[ACTIVITY] Weekly status

by Revital Eres

Continue looking at Richard's micro benchmarks taken from libav w.r.t SMS and experiment with different patches that Richard wrote to improve code generation. Submitted SMS related patch for minor misc fixes http://gcc.gnu.org/ml/gcc-patches/2011-09/msg00551.html Trying to understand why to new version of the patch to support instructions with REG_INC_NOTE in SMS causes bootstrap failure. Will email to the ml regarding it. (http://gcc.gnu.org/ml/gcc-patches/2011-08/msg01216.html)

13 years, 9 months

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[ACTIVITY] Weekly status

by Richard Sandiford

* Looked at LP bug 736661. Sent a patch upstream. Some positive feedback, but it hasn't been approved or rejected yet. * Looked at the old R_ARM_THM_CALL linker bug, after Matthias prepared a self-contained testcase (thanks). Attached a patch to the bug. Will submit upstream next week if testing goes OK. * Looked at why the backport of lp823708-4.5 retriggered the same bootstrap failure that Chung-Lin's patch did. Haven't been able to reproduce yet. * Looked at making the neon_vget_high/low patterns use ordinary subreg moves. Found that this triggered a fair few latent bugs in the rtl optimisers. Tried to fix those. This gave some nice improvements in some of the libav loops. * Added h264 loops to the libav microbenchmarks. * Blueprints. * Upstream patch review. Richard

13 years, 9 months

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[ACTIVITY] w36

by Asa Sandahl

* Completed First-time wiki page, at least for now. Expecting to add more information as I go. * Running SPEC2K on the Snowball board. The tests are failing because I run out out of memory. This is due to too little RAM available in the default kernel configuration. (Official HW pack.) I had a go with creating a swap file on the SD-card. The tests are then running, but results are slow (which makes sense). Will try to make more memory available with changed uboot-option, or with a fresh kernel. * Discussing with Michael about benchmark candidates that will add a web browsing perspective to the benchmarks we have. I suggest Sunspider and V8 benchmark suite for the JavaScript aspect, and EEMBC Browsing Bench and perhaps ARMBBench for the load and render aspect. As for the imaging aspect we have DENBench and ConsumerBench. Best Regards Åsa

13 years, 9 months

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GCC Trunk r178719 fails to build

by Michael Hope

For reference, trunk r178719 fails to build in an A9 or ARMv5 configuration: http://builds.linaro.org/toolchain/gcc-4.7~svn178719/logs/armv7l-natty-cbui… The error is: /scratch/cbuild/slave/slaves/ursa4/gcc-4.7~svn178719/gcc/default/build/./prev-gcc/g++ -B/scratch/cbuild/slave/slaves/ursa4/gcc-4.7~svn178719/gcc/default/build/./prev-gcc/ -B/scratch/cbuild/slave/slaves/ursa4/gcc-4.7~svn178719/gcc/default/install/armv7l-unknown-linux-gnueabi/bin/ -nostdinc++ -B/scratch/cbuild/slave/slaves/ursa4/gcc-4.7~svn178719/gcc/default/build/prev-armv7l-unknown-linux-gnueabi/libstdc++-v3/src/.libs -B/scratch/cbuild/slave/slaves/ursa4/gcc-4.7~svn178719/gcc/default/build/prev-armv7l-unknown-linux-gnueabi/libstdc++-v3/libsupc++/.libs -I/scratch/cbuild/slave/slaves/ursa4/gcc-4.7~svn178719/gcc/default/build/prev-armv7l-unknown-linux-gnueabi/libstdc++-v3/include/armv7l-unknown-linux-gnueabi -I/scratch/cbuild/slave/slaves/ursa4/gcc-4.7~svn178719/gcc/default/build/prev-armv7l-unknown-linux-gnueabi/libstdc++-v3/include -I/scratch/cbuild/slave/slaves/ursa4/gcc-4.7~svn178719/gcc/gcc-4.7~/libstdc++-v3/libsupc++ -L/scratch/cbuild/slave/slaves/ursa4/gcc-4.7~svn178719/gcc/default/build/prev-armv7l-unknown-linux-gnueabi/libstdc++-v3/src/.libs -L/scratch/cbuild/slave/slaves/ursa4/gcc-4.7~svn178719/gcc/default/build/prev-armv7l-unknown-linux-gnueabi/libstdc++-v3/libsupc++/.libs -c -g -O2 -gtoggle -DIN_GCC -W -Wall -Wwrite-strings -Wcast-qual -Wmissing-format-attribute -pedantic -Wno-long-long -Wno-variadic-macros -Wno-overlength-strings -Werror -fno-common -DHAVE_CONFIG_H -I. -I. -I../../../gcc-4.7~/gcc -I../../../gcc-4.7~/gcc/. -I../../../gcc-4.7~/gcc/../include -I../../../gcc-4.7~/gcc/../libcpp/include -I../../../gcc-4.7~/gcc/../libdecnumber -I../../../gcc-4.7~/gcc/../libdecnumber/dpd -I../libdecnumber insn-peep.c -o insn-peep.o ../../../gcc-4.7~/gcc/config/arm/arm.md: In function 'const char* output_319(rtx_def**, rtx)': ../../../gcc-4.7~/gcc/config/arm/arm.md:10636:78: error: unknown conversion type character '(' in format [-Werror=format] ../../../gcc-4.7~/gcc/config/arm/arm.md:10636:78: error: unknown conversion type character ')' in format [-Werror=format] /scratch/cbuild/slave/slaves/ursa4/gcc-4.7~svn178719/gcc/default/build/./prev-gcc/g++ -B/scratch/cbuild/slave/slaves/ursa4/gcc-4.7~svn178719/gcc/default/build/./prev-gcc/ -B/scratch/cbuild/slave/slaves/ursa4/gcc-4.7~svn178719/gcc/default/install/armv7l-unknown-linux-gnueabi/bin/ -nostdinc++ -B/scratch/cbuild/slave/slaves/ursa4/gcc-4.7~svn178719/gcc/default/build/prev-armv7l-unknown-linux-gnueabi/libstdc++-v3/src/.libs -B/scratch/cbuild/slave/slaves/ursa4/gcc-4.7~svn178719/gcc/default/build/prev-armv7l-unknown-linux-gnueabi/libstdc++-v3/libsupc++/.libs -I/scratch/cbuild/slave/slaves/ursa4/gcc-4.7~svn178719/gcc/default/build/prev-armv7l-unknown-linux-gnueabi/libstdc++-v3/include/armv7l-unknown-linux-gnueabi -I/scratch/cbuild/slave/slaves/ursa4/gcc-4.7~svn178719/gcc/default/build/prev-armv7l-unknown-linux-gnueabi/libstdc++-v3/include -I/scratch/cbuild/slave/slaves/ursa4/gcc-4.7~svn178719/gcc/gcc-4.7~/libstdc++-v3/libsupc++ -L/scratch/cbuild/slave/slaves/ursa4/gcc-4.7~svn178719/gcc/default/build/prev-armv7l-unknown-linux-gnueabi/libstdc++-v3/src/.libs -L/scratch/cbuild/slave/slaves/ursa4/gcc-4.7~svn178719/gcc/default/build/prev-armv7l-unknown-linux-gnueabi/libstdc++-v3/libsupc++/.libs -c -g -O2 -gtoggle -DIN_GCC -W -Wall -Wwrite-strings -Wcast-qual -Wmissing-format-attribute -pedantic -Wno-long-long -Wno-variadic-macros -Wno-overlength-strings -Werror -fno-common -DHAVE_CONFIG_H -I. -I. -I../../../gcc-4.7~/gcc -I../../../gcc-4.7~/gcc/. -I../../../gcc-4.7~/gcc/../include -I../../../gcc-4.7~/gcc/../libcpp/include -I../../../gcc-4.7~/gcc/../libdecnumber -I../../../gcc-4.7~/gcc/../libdecnumber/dpd -I../libdecnumber insn-preds.c -o insn-preds.o cc1plus: all warnings being treated as errors -- Michael

13 years, 9 months

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[ACTIVITY] 2011-09-09

by David Gilbert

== String routines == * Trying to understand my strlen behaviour that Michael identified - Found lots of ways of making the faster case slower, but none of making the slower case faster! - Perf not being available on Panda (bug 702999/843628) made it difficult to dig down * Fixing standards corner cases for strchr/memchr - input match needs to be truncated to char (fixes bug 842258 & 791274) * Tidying up formatting for cortex-strings release * Looking at eglibc integration again - getting confused by what has to happen in config.sub and how other users of it cope with triplets like armv7 even though it's not in config.sub == QEMU == * Testing Peter's QEMU release - All good - Lost a few hours due to the broken version of l-i-f-ui in Oneiric - PPA version works OK * A little bit of perf profiling == Other == * Managed to get hold of a nice fast build machine

13 years, 9 months

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[ACTIVITY] Sep 5 - Sep 9

by Ulrich Weigand

== GDB == * Worked on hardware watchpoint support for gdbserver. == GCC == * Analyzed root cause of three more ICEs when building Linux kernel with mainline GCC (reported by Arnd): PR target/50305: Inline asm reload failure when building Linux kernel PR middle-end/50307: SSA checking ICE when building Linux kernel PR tree-optimization/50318: ICE optimizing widening multiply-and-accumulate * Implemented proposed fix for PR target/50305 and posted for review. == Misc == * Installed updated FPGA bitfiles on my Versatile Express and verified that network stability issues (LP #673820) are now fixed. * Booked Linaro Connect Q4.11 travel. 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

13 years, 9 months

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[ACTIVITY] report week 36

by Peter Maydell

RAG: Red: Amber: Green: overrunning OMAP3 upstreaming work (mostly) replanned Current Milestones: || || Planned || Estimate || Actual || ||qemu-linaro 2011-09 || 2011-09-15 || 2011-09-15 || || Historical Milestones: ||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 || ||qemu-linaro-2011-07 || 2011-07-21 || 2011-07-21 || 2011-07-21 || ||qemu-linaro 2011-08 || 2011-08-18 || 2011-08-18 || 2011-08-18 || == upstream-omap3-patches == * more reshuffling of patches and dropping of unnecessary changes (eg code reformatting) * we're going to divide this blueprint into four, each of which has a reasonably clearly defined submilestone and an estimated 3 engineering weeks of work in it * in order to not have work on this completely push out other items on the schedule, we're going to limit work done on this to 2 or 3 days each week * still todo: actually split the blueprint, set dates for submilestones, check that other blueprints fit reasonably in the other half-week == linaro-qemu-11.11 == * built a pre-release tarball and tested it -- looks good for next week's release * investigated whether we can reinstate the firmware blobs in our releases (bringing us back into line with upstream) -- should be possible but need to go through the license approval process since some are GPLv3 == a15-system-mode-planning == * starting to see some (gentle) pressure for A15 support * thinking about what we should do here; my current opinion is that QEMU should implement an "A15 without virtualization or LPAE" -- we have Linux kernels that will boot on this, and it is essentially what an A15-on-A15 hw virt guest would see. The device work will be needed for KVM anyway. Need to write this up. == other == * submitted TSC licensing request to add the firmware blobs back into our qemu-linaro tarballs, in line with how upstream do releases * I need to track better how much time I'm spending on things like code review on qemu-devel, minor bug fixing and other things that aren't blueprints * all holiday to the end of the year now booked (see below) Current qemu patch status is tracked here: https://wiki.linaro.org/PeterMaydell/QemuPatchStatus Absences (to end of year): Sep 19, Sep 29-Oct 07, Oct 17, Nov 21, Dec 15-Jan 03: leave Oct 30-Nov 04: Linaro Connect Q4.11

13 years, 9 months

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[ACTIVITY] weekly status

by Ken Werner

Hi, * I've been setting up a new system because the old laptop died * finished the initial port of libunwind for Android on ARM * changed debuggerd to make use of libunwind to unwind the stack of crashing applications * it works and the output looks great :) * I plan to document these things in the wiki by next week Regards Ken

13 years, 9 months

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Added h264 loops to libav microbenchmarks

by Richard Sandiford

Just as an FYI, I've added these loops to the libav microbenchmarks avg-h264-chroma-mc8-8.txt avg-pixels8-8.txt ff-h264-idct-add-8-8.txt ff-put-pixels8x16-8.txt h264-loop-filter-luma-8.txt idct-internal-8.txt put-h264-chroma-mc8-8.txt put-h264-qpel8-h-lowpass-8.txt put-h264-qpel8-hv-lowpass-8.txt put-h264-qpel8-v-lowpass-8.txt based on Michael's h264 profile. These loops: decode_residual ff_h264_decode_mb_cavlc fill_decode_caches aren't really the kind of thing that the microbenchmark is designed for; running the whole h264 benchmark is probably a better test. Some of the functions in the profile just consist of two copies of a simpler loop, one after the other, so for those I just used the simpler loop. Usual microbenchmark caveats apply. Richard

13 years, 9 months

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SMS wiki page

by Revital Eres

Hi, Following our last performance meeting; I started a wiki page which describes how to use SMS: https://wiki.linaro.org/WorkingGroups/ToolChain/UsingSMS Thanks, Revital

13 years, 9 months

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[ACTIVITY] September 4-8

by Ira Rosen

Hi, * merged vector over-promotion patch to linaro-gcc-4.6 * committed upstream the change of the default vector size for NEON * continued working on widening shifts Ira

13 years, 9 months

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Benchmarking / justifying cortex-strings

by Michael Hope

Hi Dave. I've been hacking away and have checked in a couple of benchmarking and plotting scripts to lp:cortex-strings. The current results are at: http://people.linaro.org/~michaelh/incoming/strings-performance/ All are done on an A9. The results are very incomplete due to how long things take to run. I'll leave ursa3 doing these over the weekend which should flesh this out for the other routines. Your new memcpy() is looking good as well - as fast as GLIBC. -- Michael

13 years, 10 months

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Vectorised copy

by Michael Hope

While out benchmarking today, I ran across code similar to this: int *a; int *b; int *c; const int ad[320]; const int bd[320]; const int cd[320]; void fill() { for (int i = 0; i < 320; i++) { a[i] = ad[i]; b[i] = bd[i]; c[i] = cd[i]; } } I was surprised and happy to see the vectoriser kick in for the copy. The inner loop looks like: add r5, r3, ip adds r4, r3, r7 vldmia r2!, {d16-d17} vldmia r1!, {d18-d19} adds r0, r3, r6 vst1.32 {q9}, [r5] vst1.32 {q8}, [r4] vldmia r3, {d16-d17} adds r3, r3, #16 cmp r3, r8 vst1.32 {q8}, [r0] bne .L3 so r3 is the loop variable and {ip,r7} are the offsets from r3 to the destination pointers. Adding a __restrict doesn't change the code. Richard, will your auto-inc/dec changes combine the final vldmia r3, add r3 into a vldmia r3! ? Changing the int *a into in-file arrays like int a[320] gives: vldmia r0!, {d16-d17} vldmia r5!, {d18-d19} vstmia r4!, {d18-d19} vstmia r1!, {d16-d17} vldmia r2!, {d16-d17} vstmia r3!, {d16-d17} cmp r3, r6 bne .L2 Marking them as extern int a[320] goes back to the first form. Can we always use the second form? What optimisation is preventing it? -- Michael

13 years, 10 months

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Re: Memcpy and memset

by Michael Hope

On Fri, Sep 2, 2011 at 4:51 AM, David Gilbert <david.gilbert(a)linaro.org> wrote: > Hi Michael, > I've just committed a pair of memcpy's into src/linaro-a9 - memcpy.S > that is armv7 > and memcpy-hybrid.S that is a Neon hybrid which uses neon for non-aligned cases > and for large (128K or larger) copies. I've also (accidentally) > wired the memcpy-hybrid > one into the Makefile.am (I wasn't sure what the right way to do this > was - the neon_sources > seemed a good place for it, but there is nothing currently in there > that turns off the non-neon > version). > > I'd be interested in seeing the results for both; I've got a bit of > a soft spot for the hybrid > solution. > > On the memset, yes the 'and' that you added is fine - but I started > having a play and have > some performance results (on -t 128) that I don't really understand: > > > 1) and r1,#0xff > orr r1,r1,r1,lsl#8 > orr r1,r1,r1,lsl#16 > > That's your solution - and fastest at somewhere around 2270MB/s for > me - by the TRM I reckon > that should be 3 cycles. > > 2) lsls r1,#24 > orr r1,r1,r1,lsr#8 > orr r1,r1,r1,lsr#16 > > lsl isn't explicitly listed in the TRM, so I assumed that was the > same as a move with a constant > shift, which my reading is that it's a single cycle; and the lsls is 2 > bytes - so you would think > that should be as fast as yours but 2 bytes smaller - except it's > reliably down at 2228MB/s - so > it is slower. > > 3) Thinking it was an alignment issue I tried adding a mov r5,r1 to > the front of that, and got 2248MB/s - > so being faster with an extra instruction it probably was an alignment issue? > > 4) I also tried a pair of bfi's: > bfi r1,r1, #8, #8 > bfi r1,r1, #16, #16 > > That came out at 2228MB/s - and is 4 cycles by the book. Unfortunately you can't tell the performance from the latency. Attached is a micro benchmark that has the three different versions (and, ubx, lsl). After compensating for the loop time, I got: * lsl: 1.006 s * ubx: 0.876 s * and: 0.918 s even though ubx has a latency of two cycles. I then took the AND version and shifted it to the start of the file. This small change in alignment pushed it up to 1.048 s which is 14 % slower. -- Michael

13 years, 10 months

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Agenda - performance call - 2011-09-06

by Ramana Radhakrishnan

Hi, I've put a draft agenda for tomorrow's call at https://wiki.linaro.org/WorkingGroups/ToolChain/Meetings/2011-09-06 Is there something else folks would like to add to this ? Follow-up on the cortex-strings discussion from today's call ? cheers Ramana

13 years, 10 months

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[ACTIVITY] 29th - August - 3rd September

by Andrew Stubbs

* Linaro GCC Fixed up, committed and posted two bug fixes to my thumb2 constants patches, found by other people running FSF trunk. Analysed bug lp:836401 / pr50193, developed a fix, and posted it both upstream and to launchpad for testing. The launchpad tests have come back clean, and the patch is approved, but upstream have not approved it yet. Posted a query to linaro-dev mailing list asking for ARM CPU ID register numbers, and got lots back. Entered these into the patch, and begun some test builds. I will post the new verion upstream, if all's well, next week. Started looking at an optimization I discussed with Richard Earnshaw in Cambourne, in which GCC attempts to synthesize constants more efficiently by reusing constant values already in registers. I've made a start, but not much more to say just yet. * Other - Public holiday Monday. - Half day leave on Wednesday. - Internal train session

13 years, 10 months

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[ACTIVITY] Weekly status

by Revital Eres

Continue looking at Richard's micro benchmarks w.r.t SMS. Examining Ayal's comments to the patch to support instructions with REG_INC_NOTE in SMS. (http://gcc.gnu.org/ml/gcc-patches/2011-08/msg01216.html) Took one day off yestarday (4/9)

13 years, 10 months

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Csmith

by Andrew Stubbs

Do we know anything about "Csmith"? Maybe we should try it? Andrew -------- Original Message -------- Subject: Re: [PATCH][ARM] pr50193: ICE on a | (b << negative-constant) Date: Thu, 1 Sep 2011 13:21:38 +0000 (UTC) From: Joseph S. Myers <joseph(a)codesourcery.com> To: Andrew Stubbs <ams(a)codesourcery.com> CC: gcc-patches(a)gcc.gnu.org, patches(a)linaro.org Newsgroups: gmane.comp.gcc.patches References: <4E5F6B5F.2020207(a)codesourcery.com> On Thu, 1 Sep 2011, Andrew Stubbs wrote: > This patch fixes the problem by merely checking that the constant is positive. > I've confirmed that values larger than the mode-size are not a problem because > the compiler optimizes those away earlier, even at -O0. Do you mean that you have observed for some testcases that they get optimized away - or do you have reasons (if so, please state them) to believe that any possible path through the compiler that would result in a larger constant here (possibly as a result of constant propagation and other optimizations) will always result in it being optimized away as well? If it's just observation it would be better to put the complete check in here. Quite of few of the Csmith-generated bug reports from John Regehr have involved constants appearing in unexpected places as a result of transformations in the compiler. It would probably be a good idea for someone to try using Csmith to find ARM compiler bugs (both ICEs and wrong-code); pretty much all the bugs reported have been testing on x86 and x86_64, so it's likely there are quite a few bugs in the ARM back end that could be found that way. -- Joseph S. Myers joseph(a)codesourcery.com

13 years, 10 months

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[ACTIVITY] weekly status

by Ken Werner

Hi, libunwind: * improvements in case the user doesn't use ARM unwind tables but DWARF info * code used to pick ARM unwind from the crt files which says "cantunwind" android: * upgraded working base to 11.08 * continue to port libunwind to android * noticed a header file clash that causes errors * finished an android app that uses a native part to crash the process * as a vehicle to test the modified debuggerd Regards Ken

13 years, 10 months

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