------- Comment #3 from hjl dot tools at gmail dot com 2008-09-04 17:43 ------- The problem may be in IRA_COVER_CLASSES. -mtune=core2 turns on TARGET_INTER_UNIT_MOVES, which means move between mmx and 64bit integer registers is cheaper than load/store. But IRA doesn't handle it properly.
-- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37364
