http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48367
--- Comment #6 from Vladimir Makarov <vmakarov at redhat dot com> 2011-03-31 01:05:33 UTC --- The problem was in a typo in ira-costs.c which in some cases results in assigning INT_MAX to memory_cost and as consequence ALL_REGS to some allocnos. After some optimizations the allocno which got a hard reg and corresponds to loop which contains subloops and never referenced in its loop is spilled in function move_spill_restore and because it is never referenced in the loop, it got zero costs for all hard regs. In reload, the allocno is assigned to a mmx hard register through IRA which corrupted by sse registers usage in other program places. I'll sent a patch soon to fix this.
