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[Bug middle-end/77515] GCC fusing of multiply-add ["FMA"] occurring at "-O3" withOUT "-ffast-math" and withOUT "-ffp-contract=fast"
- From: "pinskia at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Wed, 07 Sep 2016 17:04:10 +0000
- Subject: [Bug middle-end/77515] GCC fusing of multiply-add ["FMA"] occurring at "-O3" withOUT "-ffast-math" and withOUT "-ffp-contract=fast"
- Auto-submitted: auto-generated
- References: <bug-77515-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77515
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |INVALID
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
GCC enables it with -O2 not just -O3.
GCC also defaults to -ffp-contract=on.
This has been true since 2.95.3 or even earlier (most likely ever since PowerPC
support was added).