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* [Bug target/101543] New: extra zeroing of empty struct argument/return value @ 2021-07-21 5:37 pinskia at gcc dot gnu.org 2021-07-21 5:38 ` [Bug target/101543] " pinskia at gcc dot gnu.org ` (5 more replies) 0 siblings, 6 replies; 7+ messages in thread From: pinskia at gcc dot gnu.org @ 2021-07-21 5:37 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101543 Bug ID: 101543 Summary: extra zeroing of empty struct argument/return value Product: gcc Version: 12.0 Status: UNCONFIRMED Keywords: missed-optimization Severity: enhancement Priority: P3 Component: target Assignee: unassigned at gcc dot gnu.org Reporter: pinskia at gcc dot gnu.org Target Milestone: --- Target: aarch64-linux-gnu Take: struct Tag { friend Tag make_tag(); private: Tag() {} }; Tag make_tag() { return Tag{}; }; void needs_tag(Tag); void foo1(void) { Tag t = make_tag(); needs_tag(t); } struct Tag1 {}; struct Tag2 {}; struct Tag3 {}; struct Tag4 {}; struct Tag5 {}; void needs_tags(int x, Tag1 t1, Tag2 t2, Tag3 t3, Tag4 t4, Tag5 t5, int y); void foo2(Tag1 t1, Tag2 t2, Tag3 t3, Tag4 t4, Tag5 t5) { needs_tags(12345, t1, t2, t3, t4, t5, t6, t7,t8, 200); } ---- CUT --- In make_tag the return register does not need to be zerod. In foo1, the argument x0 does not need to be zeroed before passing to needs_tag. In foo2, argument registers x1-x5 don't need to have been zeroed before passing to needs_tags. ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug target/101543] extra zeroing of empty struct argument/return value 2021-07-21 5:37 [Bug target/101543] New: extra zeroing of empty struct argument/return value pinskia at gcc dot gnu.org @ 2021-07-21 5:38 ` pinskia at gcc dot gnu.org 2021-07-27 18:45 ` pinskia at gcc dot gnu.org ` (4 subsequent siblings) 5 siblings, 0 replies; 7+ messages in thread From: pinskia at gcc dot gnu.org @ 2021-07-21 5:38 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101543 Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- See Also| |https://gcc.gnu.org/bugzill | |a/show_bug.cgi?id=98884 --- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> --- This is similar to https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98884 but with still not skipping the register part. ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug target/101543] extra zeroing of empty struct argument/return value 2021-07-21 5:37 [Bug target/101543] New: extra zeroing of empty struct argument/return value pinskia at gcc dot gnu.org 2021-07-21 5:38 ` [Bug target/101543] " pinskia at gcc dot gnu.org @ 2021-07-27 18:45 ` pinskia at gcc dot gnu.org 2021-07-29 14:11 ` belagod at gcc dot gnu.org ` (3 subsequent siblings) 5 siblings, 0 replies; 7+ messages in thread From: pinskia at gcc dot gnu.org @ 2021-07-27 18:45 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101543 --- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> --- Note RTL optimizers don't like registers being uninitilized but maybe there is way to do it ... ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug target/101543] extra zeroing of empty struct argument/return value 2021-07-21 5:37 [Bug target/101543] New: extra zeroing of empty struct argument/return value pinskia at gcc dot gnu.org 2021-07-21 5:38 ` [Bug target/101543] " pinskia at gcc dot gnu.org 2021-07-27 18:45 ` pinskia at gcc dot gnu.org @ 2021-07-29 14:11 ` belagod at gcc dot gnu.org 2021-07-29 14:12 ` belagod at gcc dot gnu.org ` (2 subsequent siblings) 5 siblings, 0 replies; 7+ messages in thread From: belagod at gcc dot gnu.org @ 2021-07-29 14:11 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101543 Tejas Belagod <belagod at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |ASSIGNED Ever confirmed|0 |1 Last reconfirmed| |2021-07-29 CC| |belagod at gcc dot gnu.org ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug target/101543] extra zeroing of empty struct argument/return value 2021-07-21 5:37 [Bug target/101543] New: extra zeroing of empty struct argument/return value pinskia at gcc dot gnu.org ` (2 preceding siblings ...) 2021-07-29 14:11 ` belagod at gcc dot gnu.org @ 2021-07-29 14:12 ` belagod at gcc dot gnu.org 2021-09-22 20:35 ` gabravier at gmail dot com 2021-09-22 20:36 ` gabravier at gmail dot com 5 siblings, 0 replies; 7+ messages in thread From: belagod at gcc dot gnu.org @ 2021-07-29 14:12 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101543 Tejas Belagod <belagod at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|ASSIGNED |UNCONFIRMED Ever confirmed|1 |0 ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug target/101543] extra zeroing of empty struct argument/return value 2021-07-21 5:37 [Bug target/101543] New: extra zeroing of empty struct argument/return value pinskia at gcc dot gnu.org ` (3 preceding siblings ...) 2021-07-29 14:12 ` belagod at gcc dot gnu.org @ 2021-09-22 20:35 ` gabravier at gmail dot com 2021-09-22 20:36 ` gabravier at gmail dot com 5 siblings, 0 replies; 7+ messages in thread From: gabravier at gmail dot com @ 2021-09-22 20:35 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101543 Gabriel Ravier <gabravier at gmail dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |gabravier at gmail dot com --- Comment #3 from Gabriel Ravier <gabravier at gmail dot com> --- Seems to be fixed on trunk. ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug target/101543] extra zeroing of empty struct argument/return value 2021-07-21 5:37 [Bug target/101543] New: extra zeroing of empty struct argument/return value pinskia at gcc dot gnu.org ` (4 preceding siblings ...) 2021-09-22 20:35 ` gabravier at gmail dot com @ 2021-09-22 20:36 ` gabravier at gmail dot com 5 siblings, 0 replies; 7+ messages in thread From: gabravier at gmail dot com @ 2021-09-22 20:36 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101543 --- Comment #4 from Gabriel Ravier <gabravier at gmail dot com> --- Nevermind, didn't see this was an aarch64 bug ^ permalink raw reply [flat|nested] 7+ messages in thread
end of thread, other threads:[~2021-09-22 20:36 UTC | newest] Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2021-07-21 5:37 [Bug target/101543] New: extra zeroing of empty struct argument/return value pinskia at gcc dot gnu.org 2021-07-21 5:38 ` [Bug target/101543] " pinskia at gcc dot gnu.org 2021-07-27 18:45 ` pinskia at gcc dot gnu.org 2021-07-29 14:11 ` belagod at gcc dot gnu.org 2021-07-29 14:12 ` belagod at gcc dot gnu.org 2021-09-22 20:35 ` gabravier at gmail dot com 2021-09-22 20:36 ` gabravier at gmail dot com
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