http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53974
--- Comment #7 from Eric Botcazou <ebotcazou at gcc dot gnu.org> 2012-07-20 15:01:49 UTC --- > I believe that the definition of HARD_REGNO_MODE_OK on PA prevents > partially overlapping > DImode registers. See comment comment for HARD_REGNO_MODE_OK . So, > clobbering %R0 can't affect %1. Sure, just like on SPARC, but DImode arguments can nevertheless be unaligned.
