[Bug rtl-optimization/50107] [IRA, i386] allocates regiters in very non-optimal way

[hjl.tools at gmail dot com]

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.