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* [Bug tree-optimization/96715] New: Failure to optimize copysign of variable by negated variable
@ 2020-08-19 20:31 gabravier at gmail dot com
2020-08-24 14:13 ` [Bug tree-optimization/96715] " jakub at gcc dot gnu.org
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: gabravier at gmail dot com @ 2020-08-19 20:31 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96715
Bug ID: 96715
Summary: Failure to optimize copysign of variable by negated
variable
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: ---
float f(float x, float y)
{
return __builtin_copysignf(x, -x);
}
This can be optimized to `return -x;`. This transformation is done by LLVM, but
not by GCC.
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug tree-optimization/96715] Failure to optimize copysign of variable by negated variable
2020-08-19 20:31 [Bug tree-optimization/96715] New: Failure to optimize copysign of variable by negated variable gabravier at gmail dot com
@ 2020-08-24 14:13 ` jakub at gcc dot gnu.org
2020-08-25 5:22 ` cvs-commit at gcc dot gnu.org
2020-08-25 11:14 ` rguenth at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: jakub at gcc dot gnu.org @ 2020-08-24 14:13 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96715
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Last reconfirmed| |2020-08-24
Assignee|unassigned at gcc dot gnu.org |jakub at gcc dot gnu.org
Status|UNCONFIRMED |ASSIGNED
Ever confirmed|0 |1
--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 49115
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=49115&action=edit
gcc11-pr96715.patch
Untested fix.
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug tree-optimization/96715] Failure to optimize copysign of variable by negated variable
2020-08-19 20:31 [Bug tree-optimization/96715] New: Failure to optimize copysign of variable by negated variable gabravier at gmail dot com
2020-08-24 14:13 ` [Bug tree-optimization/96715] " jakub at gcc dot gnu.org
@ 2020-08-25 5:22 ` cvs-commit at gcc dot gnu.org
2020-08-25 11:14 ` rguenth at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2020-08-25 5:22 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96715
--- Comment #2 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:bb5e895245ebef488b63efc239f64488aef65cf1
commit r11-2832-gbb5e895245ebef488b63efc239f64488aef65cf1
Author: Jakub Jelinek <jakub@redhat.com>
Date: Tue Aug 25 07:21:26 2020 +0200
match.pd: Simplify copysign (x, -x) to -x [PR96715]
The following patch implements an optimization suggested in the PR,
copysign(x,-x) can be optimized into -x (even without -ffast-math,
should work fine even for signed zeros and infinities or nans).
2020-08-25 Jakub Jelinek <jakub@redhat.com>
PR tree-optimization/96715
* match.pd (copysign(x,-x) -> -x): New simplification.
* gcc.dg/tree-ssa/copy-sign-3.c: New test.
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug tree-optimization/96715] Failure to optimize copysign of variable by negated variable
2020-08-19 20:31 [Bug tree-optimization/96715] New: Failure to optimize copysign of variable by negated variable gabravier at gmail dot com
2020-08-24 14:13 ` [Bug tree-optimization/96715] " jakub at gcc dot gnu.org
2020-08-25 5:22 ` cvs-commit at gcc dot gnu.org
@ 2020-08-25 11:14 ` rguenth at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: rguenth at gcc dot gnu.org @ 2020-08-25 11:14 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96715
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed.
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2020-08-25 11:14 UTC | newest]
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2020-08-19 20:31 [Bug tree-optimization/96715] New: Failure to optimize copysign of variable by negated variable gabravier at gmail dot com
2020-08-24 14:13 ` [Bug tree-optimization/96715] " jakub at gcc dot gnu.org
2020-08-25 5:22 ` cvs-commit at gcc dot gnu.org
2020-08-25 11:14 ` rguenth at gcc dot gnu.org
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