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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] Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 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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