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[Bug tree-optimization/37242] missed FRE opportunity because of signedness of addition
- From: "bonzini at gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 28 Aug 2008 06:16:54 -0000
- Subject: [Bug tree-optimization/37242] missed FRE opportunity because of signedness of addition
- References: <bug-37242-7849@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #13 from bonzini at gnu dot org 2008-08-28 06:16 -------
Answering to your comment #11, one is a sizetype and one is not. But it is
enough to extend my fold-const.c patch to MULT_EXPRs in order to catch it.
Also, the problem with the full testcase is that PRE is not cascading "enough".
Adding another PRE pass right after the first catches it.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37242