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[Bug tree-optimization/24123] [4.1 Regression] Massive performance regression for -ffast-math due to the recip tree pass
- From: "bonzini at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 12 Oct 2005 09:38:58 -0000
- Subject: [Bug tree-optimization/24123] [4.1 Regression] Massive performance regression for -ffast-math due to the recip tree pass
- References: <bug-24123-1649@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #21 from bonzini at gcc dot gnu dot org 2005-10-12 09:38 -------
Uros found that tweaking the PR23948 patch to require at least three divisions
is more profitable (speed-wise). I'll make it a param.
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24123