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[Bug target/35045] [4.3 Regression] gcc-4.3 generates wrong code on i386 with -O3
- From: "matz at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 1 Feb 2008 14:45:45 -0000
- Subject: [Bug target/35045] [4.3 Regression] gcc-4.3 generates wrong code on i386 with -O3
- References: <bug-35045-8932@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #21 from matz at gcc dot gnu dot org 2008-02-01 14:45 -------
GCSE itself might or might not be safe, I haven't yet gone through all paths.
But normally it enters only pseudo regs into the hash tables. It does
remember invalidation of hard-regs, though, and that definitely is broken in
the same way. The question is just, if it matters in the end, if it only
ever fiddles with instructions setting/using pseudos.
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35045