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[Bug tree-optimization/18048] [4.0 Regression] mgrid loop performance regression with ivopts (register pressure)
- From: "dje at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 14 Feb 2005 16:03:41 -0000
- Subject: [Bug tree-optimization/18048] [4.0 Regression] mgrid loop performance regression with ivopts (register pressure)
- References: <20041018192236.18048.dje@gcc.gnu.org>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Additional Comments From dje at gcc dot gnu dot org 2005-02-14 16:03 -------
With -O2/-O3 -funroll loops -fswitch-loops -fpeel-loops, mgrid (and swim) no
longer regress. With just -O2/-O3, performance regression for mgrid remains
(and swim performance dropped dramatically).
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18048