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* [Bug rtl-optimization/57468] New: [4.9 Regression] 26% performance drop on important benchmark after r199298.
@ 2013-05-30 10:53 ysrumyan at gmail dot com
2013-05-30 10:55 ` [Bug rtl-optimization/57468] " ysrumyan at gmail dot com
` (3 more replies)
0 siblings, 4 replies; 5+ messages in thread
From: ysrumyan at gmail dot com @ 2013-05-30 10:53 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57468
Bug ID: 57468
Summary: [4.9 Regression] 26% performance drop on important
benchmark after r199298.
Product: gcc
Version: 4.9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: rtl-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: ysrumyan at gmail dot com
We found significant performance drop after changes in lra phase, which can be
demonstrated on example from
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55342
I will attach test-case.
And we can see that redundant spill/reload was generated for inner loop that
leads to performance degradation:
.L4:
movl %esi, %edx
addl $4, %eax
subl %edx, %ebx
subl %edx, %ecx
movzbl (%esp), %edx
movb %cl, -3(%eax)
movl %esi, %ecx
movl %esi, (%esp) <<-- redundant spill
movb %bl, -4(%eax)
movzbl (%esp), %ebx <<-- redundant fill
subl %ecx, %edx
movb %dl, -2(%eax)
cmpl %ebp, 4(%esp)
movb %bl, -1(%eax)
je .L1
^ permalink raw reply [flat|nested] 5+ messages in thread* [Bug rtl-optimization/57468] [4.9 Regression] 26% performance drop on important benchmark after r199298. 2013-05-30 10:53 [Bug rtl-optimization/57468] New: [4.9 Regression] 26% performance drop on important benchmark after r199298 ysrumyan at gmail dot com @ 2013-05-30 10:55 ` ysrumyan at gmail dot com 2013-06-06 15:14 ` vmakarov at gcc dot gnu.org ` (2 subsequent siblings) 3 siblings, 0 replies; 5+ messages in thread From: ysrumyan at gmail dot com @ 2013-05-30 10:55 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57468 --- Comment #1 from Yuri Rumyantsev <ysrumyan at gmail dot com> --- Created attachment 30224 --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=30224&action=edit test-case to reproduce It should be compiled on x86 with "-O2 -m32" options. ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug rtl-optimization/57468] [4.9 Regression] 26% performance drop on important benchmark after r199298. 2013-05-30 10:53 [Bug rtl-optimization/57468] New: [4.9 Regression] 26% performance drop on important benchmark after r199298 ysrumyan at gmail dot com 2013-05-30 10:55 ` [Bug rtl-optimization/57468] " ysrumyan at gmail dot com @ 2013-06-06 15:14 ` vmakarov at gcc dot gnu.org 2013-06-08 17:17 ` izamyatin at gmail dot com 2013-06-12 8:09 ` jakub at gcc dot gnu.org 3 siblings, 0 replies; 5+ messages in thread From: vmakarov at gcc dot gnu.org @ 2013-06-06 15:14 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57468 Vladimir Makarov <vmakarov at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |vmakarov at gcc dot gnu.org --- Comment #2 from Vladimir Makarov <vmakarov at gcc dot gnu.org> --- Thanks for reporting this. I guess the secondary reload is generated when one pseudo is spilled. I'll be working on this. ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug rtl-optimization/57468] [4.9 Regression] 26% performance drop on important benchmark after r199298. 2013-05-30 10:53 [Bug rtl-optimization/57468] New: [4.9 Regression] 26% performance drop on important benchmark after r199298 ysrumyan at gmail dot com 2013-05-30 10:55 ` [Bug rtl-optimization/57468] " ysrumyan at gmail dot com 2013-06-06 15:14 ` vmakarov at gcc dot gnu.org @ 2013-06-08 17:17 ` izamyatin at gmail dot com 2013-06-12 8:09 ` jakub at gcc dot gnu.org 3 siblings, 0 replies; 5+ messages in thread From: izamyatin at gmail dot com @ 2013-06-08 17:17 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57468 --- Comment #3 from Igor Zamyatin <izamyatin at gmail dot com> --- Patch is here http://gcc.gnu.org/ml/gcc-patches/2013-06/msg00357.html ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug rtl-optimization/57468] [4.9 Regression] 26% performance drop on important benchmark after r199298. 2013-05-30 10:53 [Bug rtl-optimization/57468] New: [4.9 Regression] 26% performance drop on important benchmark after r199298 ysrumyan at gmail dot com ` (2 preceding siblings ...) 2013-06-08 17:17 ` izamyatin at gmail dot com @ 2013-06-12 8:09 ` jakub at gcc dot gnu.org 3 siblings, 0 replies; 5+ messages in thread From: jakub at gcc dot gnu.org @ 2013-06-12 8:09 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57468 Jakub Jelinek <jakub at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |RESOLVED CC| |jakub at gcc dot gnu.org Resolution|--- |FIXED --- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> --- Thus fixed. ^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2013-06-12 8:09 UTC | newest] Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2013-05-30 10:53 [Bug rtl-optimization/57468] New: [4.9 Regression] 26% performance drop on important benchmark after r199298 ysrumyan at gmail dot com 2013-05-30 10:55 ` [Bug rtl-optimization/57468] " ysrumyan at gmail dot com 2013-06-06 15:14 ` vmakarov at gcc dot gnu.org 2013-06-08 17:17 ` izamyatin at gmail dot com 2013-06-12 8:09 ` jakub at gcc dot gnu.org
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