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[Bug rtl-optimization/50904] [4.7 regression] pessimization when -fno-protect-parens is enabled by -Ofast
- From: "rguenth at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Mon, 05 Dec 2011 10:19:11 +0000
- Subject: [Bug rtl-optimization/50904] [4.7 regression] pessimization when -fno-protect-parens is enabled by -Ofast
- Auto-submitted: auto-generated
- References: <bug-50904-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50904
--- Comment #42 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-12-05 10:19:11 UTC ---
Argh. It seems LIM didn't get proper lifting both at tuplification and
alias-improvements time. So it's memory handling (everything it does
with VOPs) is a little very much conservative (read: it doesn't really work).
I'll look into this.