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[Bug tree-optimization/52459] [x86] loop performance very bad (worse than -O0) when using sse4.2 popcnt
- 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: Fri, 02 Mar 2012 07:19:49 +0000
- Subject: [Bug tree-optimization/52459] [x86] loop performance very bad (worse than -O0) when using sse4.2 popcnt
- Auto-submitted: auto-generated
- References: <bug-52459-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52459
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|[x86] loop vectorization |[x86] loop performance very
|performance very bad (worse |bad (worse than -O0) when
|than -O0) when using sse4.2 |using sse4.2 popcnt
|popcnt |
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> 2012-03-02 07:19:49 UTC ---
This has nothing to do with the vectorizer but rather PPRE.