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[Bug rtl-optimization/23812] swapping DImode halves produces poor x86 register allocation
- From: "michael dot meissner at amd dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 18 Oct 2005 17:44:23 -0000
- Subject: [Bug rtl-optimization/23812] swapping DImode halves produces poor x86 register allocation
- References: <bug-23812-11337@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #3 from michael dot meissner at amd dot com 2005-10-18 17:44 -------
Note, since this is a rotate, the patches I proposed in 17886 will generate
much better code for this one case (basically mov/mov/xchgl -- it could be
improved by a peephole to do the moves directly instead of xchgl). However,
the more general subreg problem needs to be looked at.
--
michael dot meissner at amd dot com changed:
What |Removed |Added
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CC| |michael dot meissner at amd
| |dot com
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23812