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* [Bug tree-optimization/95176] New: Failure to optimize division followed by multiplication to modulo followed by subtraction
@ 2020-05-17 17:13 gabravier at gmail dot com
2020-05-17 17:25 ` [Bug tree-optimization/95176] " pinskia at gcc dot gnu.org
` (3 more replies)
0 siblings, 4 replies; 5+ messages in thread
From: gabravier at gmail dot com @ 2020-05-17 17:13 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95176
Bug ID: 95176
Summary: Failure to optimize division followed by
multiplication to modulo followed by subtraction
Product: gcc
Version: 11.0
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 f(int a, int b)
{
return a * (b / a);
}
This is equivalent to `return b - (b % a);`. This transformation is done by
LLVM, but not by GCC.
^ permalink raw reply [flat|nested] 5+ messages in thread* [Bug tree-optimization/95176] Failure to optimize division followed by multiplication to modulo followed by subtraction 2020-05-17 17:13 [Bug tree-optimization/95176] New: Failure to optimize division followed by multiplication to modulo followed by subtraction gabravier at gmail dot com @ 2020-05-17 17:25 ` pinskia at gcc dot gnu.org 2020-05-18 6:28 ` rguenth at gcc dot gnu.org ` (2 subsequent siblings) 3 siblings, 0 replies; 5+ messages in thread From: pinskia at gcc dot gnu.org @ 2020-05-17 17:25 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95176 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 tree-optimization/95176] Failure to optimize division followed by multiplication to modulo followed by subtraction 2020-05-17 17:13 [Bug tree-optimization/95176] New: Failure to optimize division followed by multiplication to modulo followed by subtraction gabravier at gmail dot com 2020-05-17 17:25 ` [Bug tree-optimization/95176] " pinskia at gcc dot gnu.org @ 2020-05-18 6:28 ` rguenth at gcc dot gnu.org 2021-08-12 14:09 ` arjun.is at lostca dot se 2021-08-24 19:51 ` arjun.is at lostca dot se 3 siblings, 0 replies; 5+ messages in thread From: rguenth at gcc dot gnu.org @ 2020-05-18 6:28 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95176 Richard Biener <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Ever confirmed|0 |1 Keywords| |easyhack Last reconfirmed| |2020-05-18 Status|UNCONFIRMED |NEW --- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> --- Confirmed. ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug tree-optimization/95176] Failure to optimize division followed by multiplication to modulo followed by subtraction 2020-05-17 17:13 [Bug tree-optimization/95176] New: Failure to optimize division followed by multiplication to modulo followed by subtraction gabravier at gmail dot com 2020-05-17 17:25 ` [Bug tree-optimization/95176] " pinskia at gcc dot gnu.org 2020-05-18 6:28 ` rguenth at gcc dot gnu.org @ 2021-08-12 14:09 ` arjun.is at lostca dot se 2021-08-24 19:51 ` arjun.is at lostca dot se 3 siblings, 0 replies; 5+ messages in thread From: arjun.is at lostca dot se @ 2021-08-12 14:09 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95176 Arjun Shankar <arjun.is at lostca dot se> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |arjun.is at lostca dot se --- Comment #2 from Arjun Shankar <arjun.is at lostca dot se> --- This appears to have been fixed as bug 96696 via the following commit: https://gcc.gnu.org/g:3dcd1334b4f522352b80814513fdca902fc2a207 ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug tree-optimization/95176] Failure to optimize division followed by multiplication to modulo followed by subtraction 2020-05-17 17:13 [Bug tree-optimization/95176] New: Failure to optimize division followed by multiplication to modulo followed by subtraction gabravier at gmail dot com ` (2 preceding siblings ...) 2021-08-12 14:09 ` arjun.is at lostca dot se @ 2021-08-24 19:51 ` arjun.is at lostca dot se 3 siblings, 0 replies; 5+ messages in thread From: arjun.is at lostca dot se @ 2021-08-24 19:51 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95176 Arjun Shankar <arjun.is at lostca dot se> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED Target Milestone|--- |12.0 Resolution|--- |FIXED --- Comment #3 from Arjun Shankar <arjun.is at lostca dot se> --- This should make it to GCC 12 when it's released, so I'm closing it accordingly. ^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2021-08-24 19:51 UTC | newest] Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2020-05-17 17:13 [Bug tree-optimization/95176] New: Failure to optimize division followed by multiplication to modulo followed by subtraction gabravier at gmail dot com 2020-05-17 17:25 ` [Bug tree-optimization/95176] " pinskia at gcc dot gnu.org 2020-05-18 6:28 ` rguenth at gcc dot gnu.org 2021-08-12 14:09 ` arjun.is at lostca dot se 2021-08-24 19:51 ` arjun.is at lostca dot se
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