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* [Bug target/102672] New: [AArch64] Failure to optimize to using stp instead of 2 strs when possible @ 2021-10-09 21:01 gabravier at gmail dot com 2021-10-09 21:10 ` [Bug target/102672] " pinskia at gcc dot gnu.org ` (3 more replies) 0 siblings, 4 replies; 5+ messages in thread From: gabravier at gmail dot com @ 2021-10-09 21:01 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102672 Bug ID: 102672 Summary: [AArch64] Failure to optimize to using stp instead of 2 strs when possible Product: gcc Version: 12.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: target Assignee: unassigned at gcc dot gnu.org Reporter: gabravier at gmail dot com Target Milestone: --- struct X { int i; void *p; }; void foo(struct X *q, void *p) { struct X b{}; b.p = p; *q = b; } With -O3, GCC outputs this: foo(X*, void*): str wzr, [x0] str x1, [x0, 8] ret LLVM instead outputs this: foo(X*, void*): stp xzr, x1, [x0] ret ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug target/102672] [AArch64] Failure to optimize to using stp instead of 2 strs when possible 2021-10-09 21:01 [Bug target/102672] New: [AArch64] Failure to optimize to using stp instead of 2 strs when possible gabravier at gmail dot com @ 2021-10-09 21:10 ` pinskia at gcc dot gnu.org 2021-10-09 21:10 ` pinskia at gcc dot gnu.org ` (2 subsequent siblings) 3 siblings, 0 replies; 5+ messages in thread From: pinskia at gcc dot gnu.org @ 2021-10-09 21:10 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102672 --- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> --- Padding bytes are not zero in some cases and this is the case here. ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug target/102672] [AArch64] Failure to optimize to using stp instead of 2 strs when possible 2021-10-09 21:01 [Bug target/102672] New: [AArch64] Failure to optimize to using stp instead of 2 strs when possible gabravier at gmail dot com 2021-10-09 21:10 ` [Bug target/102672] " pinskia at gcc dot gnu.org @ 2021-10-09 21:10 ` pinskia at gcc dot gnu.org 2021-10-09 21:17 ` pinskia at gcc dot gnu.org 2021-10-10 20:06 ` pinskia at gcc dot gnu.org 3 siblings, 0 replies; 5+ messages in thread From: pinskia at gcc dot gnu.org @ 2021-10-09 21:10 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102672 --- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> --- There might be another bugs similar to this already too. ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug target/102672] [AArch64] Failure to optimize to using stp instead of 2 strs when possible 2021-10-09 21:01 [Bug target/102672] New: [AArch64] Failure to optimize to using stp instead of 2 strs when possible gabravier at gmail dot com 2021-10-09 21:10 ` [Bug target/102672] " pinskia at gcc dot gnu.org 2021-10-09 21:10 ` pinskia at gcc dot gnu.org @ 2021-10-09 21:17 ` pinskia at gcc dot gnu.org 2021-10-10 20:06 ` pinskia at gcc dot gnu.org 3 siblings, 0 replies; 5+ messages in thread From: pinskia at gcc dot gnu.org @ 2021-10-09 21:17 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102672 Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Severity|normal |enhancement ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug target/102672] [AArch64] Failure to optimize to using stp instead of 2 strs when possible 2021-10-09 21:01 [Bug target/102672] New: [AArch64] Failure to optimize to using stp instead of 2 strs when possible gabravier at gmail dot com ` (2 preceding siblings ...) 2021-10-09 21:17 ` pinskia at gcc dot gnu.org @ 2021-10-10 20:06 ` pinskia at gcc dot gnu.org 3 siblings, 0 replies; 5+ messages in thread From: pinskia at gcc dot gnu.org @ 2021-10-10 20:06 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102672 Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Last reconfirmed| |2021-10-10 Ever confirmed|0 |1 Status|UNCONFIRMED |NEW Depends on| |82142 --- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> --- PR 82142 is simular. Referenced Bugs: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82142 [Bug 82142] struct zeroing should use wide stores instead of avoiding overwriting padding ^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2021-10-10 20:06 UTC | newest] Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2021-10-09 21:01 [Bug target/102672] New: [AArch64] Failure to optimize to using stp instead of 2 strs when possible gabravier at gmail dot com 2021-10-09 21:10 ` [Bug target/102672] " pinskia at gcc dot gnu.org 2021-10-09 21:10 ` pinskia at gcc dot gnu.org 2021-10-09 21:17 ` pinskia at gcc dot gnu.org 2021-10-10 20:06 ` pinskia at gcc dot gnu.org
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