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* [Bug tree-optimization/94786] New: Missed min/max pattern using xor+and+less
@ 2020-04-27 8:11 gabravier at gmail dot com
2020-04-27 10:29 ` [Bug tree-optimization/94786] " rguenth at gcc dot gnu.org
` (4 more replies)
0 siblings, 5 replies; 6+ messages in thread
From: gabravier at gmail dot com @ 2020-04-27 8:11 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94786
Bug ID: 94786
Summary: Missed min/max pattern using xor+and+less
Product: gcc
Version: 10.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: gabravier at gmail dot com
Target Milestone: ---
int r1(int x, int y)
{
return y ^ ((x ^ y) & -(x < y));
}
int r2(int x, int y)
{
return x ^ ((x ^ y) & -(x < y));
}
`r1` can be optimized to `min` and `r2` to `max`. This transformation is done
by LLVM, but not by GCC.
Comparison here: https://godbolt.org/z/hNhkqM
^ permalink raw reply [flat|nested] 6+ messages in thread* [Bug tree-optimization/94786] Missed min/max pattern using xor+and+less 2020-04-27 8:11 [Bug tree-optimization/94786] New: Missed min/max pattern using xor+and+less gabravier at gmail dot com @ 2020-04-27 10:29 ` rguenth at gcc dot gnu.org 2020-05-07 16:31 ` jakub at gcc dot gnu.org ` (3 subsequent siblings) 4 siblings, 0 replies; 6+ messages in thread From: rguenth at gcc dot gnu.org @ 2020-04-27 10:29 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94786 Richard Biener <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Last reconfirmed| |2020-04-27 Keywords| |easyhack Status|UNCONFIRMED |NEW Ever confirmed|0 |1 --- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> --- Confirmed. ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug tree-optimization/94786] Missed min/max pattern using xor+and+less 2020-04-27 8:11 [Bug tree-optimization/94786] New: Missed min/max pattern using xor+and+less gabravier at gmail dot com 2020-04-27 10:29 ` [Bug tree-optimization/94786] " rguenth at gcc dot gnu.org @ 2020-05-07 16:31 ` jakub at gcc dot gnu.org 2020-05-07 16:44 ` jakub at gcc dot gnu.org ` (2 subsequent siblings) 4 siblings, 0 replies; 6+ messages in thread From: jakub at gcc dot gnu.org @ 2020-05-07 16:31 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94786 Jakub Jelinek <jakub at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |jakub at gcc dot gnu.org Status|NEW |ASSIGNED Assignee|unassigned at gcc dot gnu.org |jakub at gcc dot gnu.org --- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> --- Seems this is PR92834 just using ^ instead of -. ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug tree-optimization/94786] Missed min/max pattern using xor+and+less 2020-04-27 8:11 [Bug tree-optimization/94786] New: Missed min/max pattern using xor+and+less gabravier at gmail dot com 2020-04-27 10:29 ` [Bug tree-optimization/94786] " rguenth at gcc dot gnu.org 2020-05-07 16:31 ` jakub at gcc dot gnu.org @ 2020-05-07 16:44 ` jakub at gcc dot gnu.org 2020-05-08 8:55 ` cvs-commit at gcc dot gnu.org 2020-05-08 8:56 ` jakub at gcc dot gnu.org 4 siblings, 0 replies; 6+ messages in thread From: jakub at gcc dot gnu.org @ 2020-05-07 16:44 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94786 --- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> --- Created attachment 48475 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=48475&action=edit gcc11-pr94786.patch Untested fix. ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug tree-optimization/94786] Missed min/max pattern using xor+and+less 2020-04-27 8:11 [Bug tree-optimization/94786] New: Missed min/max pattern using xor+and+less gabravier at gmail dot com ` (2 preceding siblings ...) 2020-05-07 16:44 ` jakub at gcc dot gnu.org @ 2020-05-08 8:55 ` cvs-commit at gcc dot gnu.org 2020-05-08 8:56 ` jakub at gcc dot gnu.org 4 siblings, 0 replies; 6+ messages in thread From: cvs-commit at gcc dot gnu.org @ 2020-05-08 8:55 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94786 --- Comment #4 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Jakub Jelinek <jakub@gcc.gnu.org>: https://gcc.gnu.org/g:1595a1cb7bfac8d5a6026d5d6f3a495be0391506 commit r11-198-g1595a1cb7bfac8d5a6026d5d6f3a495be0391506 Author: Jakub Jelinek <jakub@redhat.com> Date: Fri May 8 10:52:47 2020 +0200 match.pd: A ^ ((A ^ B) & -(C cmp D)) -> (C cmp D) ? B : A simplification [PR94786] We already have x - ((x - y) & -(z < w)) and x + ((y - x) & -(z < w)) simplifications, this one adds x ^ ((x ^ y) & -(z < w)) (not merged using for because of the :c that can be present on bit_xor and can't on minus). 2020-05-08 Jakub Jelinek <jakub@redhat.com> PR tree-optimization/94786 * match.pd (A ^ ((A ^ B) & -(C cmp D)) -> (C cmp D) ? B : A): New simplification. * gcc.dg/tree-ssa/pr94786.c: New test. ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug tree-optimization/94786] Missed min/max pattern using xor+and+less 2020-04-27 8:11 [Bug tree-optimization/94786] New: Missed min/max pattern using xor+and+less gabravier at gmail dot com ` (3 preceding siblings ...) 2020-05-08 8:55 ` cvs-commit at gcc dot gnu.org @ 2020-05-08 8:56 ` jakub at gcc dot gnu.org 4 siblings, 0 replies; 6+ messages in thread From: jakub at gcc dot gnu.org @ 2020-05-08 8:56 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94786 Jakub Jelinek <jakub at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|ASSIGNED |RESOLVED Resolution|--- |FIXED --- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> --- Fixed. ^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2020-05-08 8:56 UTC | newest] Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2020-04-27 8:11 [Bug tree-optimization/94786] New: Missed min/max pattern using xor+and+less gabravier at gmail dot com 2020-04-27 10:29 ` [Bug tree-optimization/94786] " rguenth at gcc dot gnu.org 2020-05-07 16:31 ` jakub at gcc dot gnu.org 2020-05-07 16:44 ` jakub at gcc dot gnu.org 2020-05-08 8:55 ` cvs-commit at gcc dot gnu.org 2020-05-08 8:56 ` jakub at gcc dot gnu.org
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