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[Bug target/33928] [4.3 Regression] 22% performance slowdown from 4.2.2 to 4.3.0 in floating-point code
- From: "rguenth at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 22 Jan 2008 12:38:07 -0000
- Subject: [Bug target/33928] [4.3 Regression] 22% performance slowdown from 4.2.2 to 4.3.0 in floating-point code
- References: <bug-33928-271@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #28 from rguenth at gcc dot gnu dot org 2008-01-22 12:38 -------
This is an alias partitioning problem, with --param max-aliased-vops=10000 I
see the sequence optimized by FRE. Or, with the alias-oracle patch for FRE
--param max-fields-for-field-sensitive=1 does the job as well.
--
rguenth at gcc dot gnu dot org changed:
What |Removed |Added
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33928