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* [Bug c/53071] New: Wrong instruction replacement when compiling for xop
@ 2012-04-22 10:07 agner at agner dot org
2012-04-22 10:09 ` [Bug target/53071] " pinskia at gcc dot gnu.org
` (3 more replies)
0 siblings, 4 replies; 5+ messages in thread
From: agner at agner dot org @ 2012-04-22 10:07 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53071
Bug #: 53071
Summary: Wrong instruction replacement when compiling for xop
Classification: Unclassified
Product: gcc
Version: 4.7.0
Status: UNCONFIRMED
Severity: critical
Priority: P3
Component: c
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: agner@agner.org
Created attachment 27216
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=27216
source code and asm output
An intrinsic vector multiply function is replaced by xop instructions when the
attached file is compiled with -mxop. Perhaps the compiler is trying to combine
a shift instruction and a multiply instruction into a single xop instruction,
but it ends up with something wrong.
This is perhaps related to bugs # 52908 and 52910.
^ permalink raw reply [flat|nested] 5+ messages in thread* [Bug target/53071] Wrong instruction replacement when compiling for xop 2012-04-22 10:07 [Bug c/53071] New: Wrong instruction replacement when compiling for xop agner at agner dot org @ 2012-04-22 10:09 ` pinskia at gcc dot gnu.org 2012-04-23 10:33 ` rguenth at gcc dot gnu.org ` (2 subsequent siblings) 3 siblings, 0 replies; 5+ messages in thread From: pinskia at gcc dot gnu.org @ 2012-04-22 10:09 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53071 Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Component|c |target Severity|critical |normal ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug target/53071] Wrong instruction replacement when compiling for xop 2012-04-22 10:07 [Bug c/53071] New: Wrong instruction replacement when compiling for xop agner at agner dot org 2012-04-22 10:09 ` [Bug target/53071] " pinskia at gcc dot gnu.org @ 2012-04-23 10:33 ` rguenth at gcc dot gnu.org 2012-11-23 7:51 ` ubizjak at gmail dot com 2024-03-17 2:33 ` sjames at gcc dot gnu.org 3 siblings, 0 replies; 5+ messages in thread From: rguenth at gcc dot gnu.org @ 2012-04-23 10:33 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53071 Richard Guenther <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Keywords| |wrong-code Status|UNCONFIRMED |NEW Last reconfirmed| |2012-04-23 Depends on| |52908, 52910 Ever Confirmed|0 |1 ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug target/53071] Wrong instruction replacement when compiling for xop 2012-04-22 10:07 [Bug c/53071] New: Wrong instruction replacement when compiling for xop agner at agner dot org 2012-04-22 10:09 ` [Bug target/53071] " pinskia at gcc dot gnu.org 2012-04-23 10:33 ` rguenth at gcc dot gnu.org @ 2012-11-23 7:51 ` ubizjak at gmail dot com 2024-03-17 2:33 ` sjames at gcc dot gnu.org 3 siblings, 0 replies; 5+ messages in thread From: ubizjak at gmail dot com @ 2012-11-23 7:51 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53071 --- Comment #1 from Uros Bizjak <ubizjak at gmail dot com> 2012-11-23 07:49:41 UTC --- Resulting asm is quite different w/ current mainline: _Z4testU8__vectorxS_S_: vmovdqa %xmm2, -24(%rsp) vpsrlq $32, %xmm0, %xmm3 vpmuldq %xmm1, %xmm0, %xmm2 vpmuldq %xmm1, %xmm3, %xmm1 vpand .LC0(%rip), %xmm1, %xmm1 vpsrlq $32, %xmm2, %xmm2 vmovd -24(%rsp), %xmm4 vpor %xmm1, %xmm2, %xmm1 vpaddd %xmm0, %xmm1, %xmm1 vpsrad $31, %xmm0, %xmm0 vpsrad %xmm4, %xmm1, %xmm1 vpsubd %xmm0, %xmm1, %xmm0 ret _Z5test2U8__vectorxS_S_: vpxor %xmm3, %xmm3, %xmm3 vmovdqa %xmm2, -24(%rsp) vpmuldq %xmm1, %xmm0, %xmm2 vpsrlq $32, %xmm2, %xmm2 vpmacsdqh %xmm3, %xmm1, %xmm0, %xmm1 vpand .LC0(%rip), %xmm1, %xmm1 vmovd -24(%rsp), %xmm4 vpor %xmm1, %xmm2, %xmm1 vpaddd %xmm0, %xmm1, %xmm1 vpsrad $31, %xmm0, %xmm0 vpsrad %xmm4, %xmm1, %xmm1 vpsubd %xmm0, %xmm1, %xmm0 ret ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug target/53071] Wrong instruction replacement when compiling for xop 2012-04-22 10:07 [Bug c/53071] New: Wrong instruction replacement when compiling for xop agner at agner dot org ` (2 preceding siblings ...) 2012-11-23 7:51 ` ubizjak at gmail dot com @ 2024-03-17 2:33 ` sjames at gcc dot gnu.org 3 siblings, 0 replies; 5+ messages in thread From: sjames at gcc dot gnu.org @ 2024-03-17 2:33 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53071 Bug 53071 depends on bug 52908, which changed state. Bug 52908 Summary: xop-mul-1:f9 miscompiled on bulldozer (-mxop) https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52908 What |Removed |Added ---------------------------------------------------------------------------- Status|ASSIGNED |RESOLVED Resolution|--- |FIXED ^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2024-03-17 2:33 UTC | newest] Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2012-04-22 10:07 [Bug c/53071] New: Wrong instruction replacement when compiling for xop agner at agner dot org 2012-04-22 10:09 ` [Bug target/53071] " pinskia at gcc dot gnu.org 2012-04-23 10:33 ` rguenth at gcc dot gnu.org 2012-11-23 7:51 ` ubizjak at gmail dot com 2024-03-17 2:33 ` sjames at gcc dot gnu.org
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