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[Bug rtl-optimization/20945] about 2x perfomance regression in comparision with 3.4.2
- From: "steven at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 25 Jun 2005 11:38:35 -0000
- Subject: [Bug rtl-optimization/20945] about 2x perfomance regression in comparision with 3.4.2
- References: <20050411131719.20945.denis.nagorny@intel.com>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Additional Comments From steven at gcc dot gnu dot org 2005-06-25 11:38 -------
And FWIW, yes there are a number of known issues with optimizing for mgrid
on ia32. Try e.g. -fno-tree-pre, this used to be a major win for mgrid.
What can you expect, when the hot loop has 11 integer register candidates
that GCC all puts in GIMPLE registers, but your silly target only has 6
registers. Long live AMD64!
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20945