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[Bug tree-optimization/68131] missed optimization and warning for broken overflow check
- 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: Wed, 28 Oct 2015 12:31:19 +0000
- Subject: [Bug tree-optimization/68131] missed optimization and warning for broken overflow check
- Auto-submitted: auto-generated
- References: <bug-68131-4 at http dot gcc dot gnu dot org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68131
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |missed-optimization
--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
We indeed do not have this optimization, only A + CST CMP CST to A CMP CST'
and related. Note that _9 might be negative so we also need range info
for this. VRPs symbolic range stuff isn't good enough to simplify this.