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[Bug target/19046] [4.0 Regression] MOVE_RATIO should be tweaked on ppc
- 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: 29 Dec 2004 18:00:52 -0000
- Subject: [Bug target/19046] [4.0 Regression] MOVE_RATIO should be tweaked on ppc
- References: <20041216222115.19046.pinskia@gcc.gnu.org>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Additional Comments From dje at gcc dot gnu dot org 2004-12-29 18:00 -------
Increasing the value of MOVE_RATIO and CLEAR_RATIO decreases SPEC
performance. The uses of the macro may be overloaded and confusing the cost
model. Or it could be harmed by register allocator and spilling. But
overall, the default values of MOVE_RATIO and CLEAR_RATIO based on movmemsi
appear to be good.
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19046