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[Bug tree-optimization/42893] [4.3/4.4/4.5 Regression] Missed conditionally dead store elimination
- From: "rguenth at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 29 Jan 2010 22:37:12 -0000
- Subject: [Bug tree-optimization/42893] [4.3/4.4/4.5 Regression] Missed conditionally dead store elimination
- References: <bug-42893-280@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #8 from rguenth at gcc dot gnu dot org 2010-01-29 22:37 -------
(In reply to comment #6)
> I think the issue here is more that we should look for a way to optimize this
> early on. I'm guessing it's one of the ce[123] passes that cleans this up for
> you on your RISCy machine? IMHO it would be better even in your case to nuke
> dumb code like this in GIMPLE (enabling other optimizations, etc.).
Predicated value-numbering with redundant store elimination should fix this.
Matz is working on that for 4.6.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42893