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[Bug rtl-optimization/41171] register allocator undoing optimal schedule
- From: "steven at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Wed, 01 Jan 2014 20:55:21 +0000
- Subject: [Bug rtl-optimization/41171] register allocator undoing optimal schedule
- Auto-submitted: auto-generated
- References: <bug-41171-4 at http dot gcc dot gnu dot org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41171
Steven Bosscher <steven at gcc dot gnu.org> changed:
What |Removed |Added
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CC| |steven at gcc dot gnu.org
--- Comment #9 from Steven Bosscher <steven at gcc dot gnu.org> ---
(In reply to Peter Bergner from comment #5)
> Looking at update_equiv_regs(), if I disable the replacement for regs
> that are local to one basic block (patch below) like it existed before
> John Wehle's patch way back in Oct 2000:
>
> http://gcc.gnu.org/ml/gcc-patches/2000-09/msg00782.html
>
> then we get the ordering we want. Does anyone know why John removed
> that part of the test in his patch? Thoughts anyone?
To allow things to be moved around in, or out of loops.