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[Bug middle-end/30904] [dataflow] No longer optimizes shifts with large count
- From: "bonzini at gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 21 Feb 2007 16:11:44 -0000
- Subject: [Bug middle-end/30904] [dataflow] No longer optimizes shifts with large count
- References: <bug-30904-10053@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #5 from bonzini at gnu dot org 2007-02-21 16:11 -------
The first one is in the same EBB as the assignment. The second one isn't and
combine screws up. This is because of the way combine treats regs with one def
that dominates all uses, I talked to zadeck yesterday about that on IRC.
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30904