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[Bug rtl-optimization/50107] [IRA, i386] allocates regiters in very non-optimal way
- From: "hjl.tools at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Wed, 17 Aug 2011 19:22:51 +0000
- Subject: [Bug rtl-optimization/50107] [IRA, i386] allocates regiters in very non-optimal way
- Auto-submitted: auto-generated
- References: <bug-50107-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50107
--- Comment #5 from H.J. Lu <hjl.tools at gmail dot com> 2011-08-17 19:22:51 UTC ---
(In reply to comment #2)
> I guess something wrong with hard register preferencing for multi-register
> pseudos in ira-color.c::ira_assign. I believe it works fine for one-register
> pseudos. I'll look at this. Thanks for reporting.
>
Does IRA choose caller-saved register over callee-saved registers?
For multi-register pseudos, one of hard register may be callee-saved.