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[Bug tree-optimization/34416] New: Tree optimization pipeline needs re-tuning
- 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: 10 Dec 2007 10:07:09 -0000
- Subject: [Bug tree-optimization/34416] New: Tree optimization pipeline needs re-tuning
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
There are several things that queued up:
- scalar cleanup after final inlining should be done before
computing aliasing (basically, re-run what we do for early
optimization also after final inlining, but at least run
copyprop, ccp, forwprop and dce)
- run an early complete loop unrolling pass unrolling _only_
innermost loops in loop nests (maybe only at -O3, setting
up of loop info is expensive)
- run DCE after vectorization, the IL is completely hosed for
tree based costs otherwise (affects unrolling costs)
--
Summary: Tree optimization pipeline needs re-tuning
Product: gcc
Version: 4.3.0
Status: UNCONFIRMED
Keywords: missed-optimization
Severity: normal
Priority: P3
Component: tree-optimization
AssignedTo: rguenth at gcc dot gnu dot org
ReportedBy: rguenth at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34416