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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 18:43:41 +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 #3 from H.J. Lu <hjl.tools at gmail dot com> 2011-08-17 18:43:41 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.
One problem is IRA ues RCX/RBX pair, instead of R8/R9, for TImode.
Since RBX is callee-saved, we have to save and restore it.
> By the way, your patch is wrong. There should be TARGET_64BIT in define_split
> instead of !TARGET_64BIT.
It has been fixed. Thanks.