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[Bug rtl-optimization/31849] [4.2/4.3 Regression] Code size regression caused by fix to PR 31360
- From: "rearnsha at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 7 May 2007 08:34:48 -0000
- Subject: [Bug rtl-optimization/31849] [4.2/4.3 Regression] Code size regression caused by fix to PR 31360
- References: <bug-31849-374@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #4 from rearnsha at gcc dot gnu dot org 2007-05-07 09:34 -------
(In reply to comment #2)
> > 1) Hoists a register containing 0 out of the loop
> The correct thing to do.
>
Not necessarily. Hoisting literal constants means that opportunities to simply
insns based on that constant are potentially lost.
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31849