[Bug middle-end/48367] [4.7 Regression] 200.sixtrack/301.apsi in SPEC CPU 2000 are miscompiled

["vmakarov at redhat dot com" <gcc-bugzilla at gcc dot gnu dot org>]

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.