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[Bug rtl-optimization/31360] [4.3 Regression] rtl loop invariant is broken
- From: "pinskia at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 26 Mar 2007 17:09:16 -0000
- Subject: [Bug rtl-optimization/31360] [4.3 Regression] rtl loop invariant is broken
- References: <bug-31360-6528@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #5 from pinskia at gcc dot gnu dot org 2007-03-26 18:09 -------
> I would agree, if we had RA capable of that (which I am not quite sure
> whether we do or not, although this seems simple enough), or better,
> RA doing better job under high register pressure.
Then how do you explain why loop.c pulled this out of the loop but the new rtl
loop invariant does not? I don't see why we should care about register
pressure except inside the RA. Every other compiler does it that way, plus
they work better than GCC.
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31360