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[Bug target/32086] [4.3 Regression] 10% to 20% Performance Regression Between 4.1.3 and 4.3
- From: "ubizjak at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 30 Nov 2007 06:42:30 -0000
- Subject: [Bug target/32086] [4.3 Regression] 10% to 20% Performance Regression Between 4.1.3 and 4.3
- References: <bug-32086-13404@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #3 from ubizjak at gmail dot com 2007-11-30 06:42 -------
(In reply to comment #1)
> w/ -fvect-cost-model:
> user 0m46.439s
Looking a bit into generated code, it looks that -fect-cost-model effectively
disables all interesting vectorizations, effectively -fno-tree-vectorize.
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32086