------- Comment #3 from rearnsha at gcc dot gnu dot org 2009-12-07 15:55 ------- I can confirm both of these issues.
in asm statements GCC currently just treats 'q4' and 'd8' as aliases for s16 (which of course is just a 32-bit register); there's currently no way of expressing that a larger entitiy is clobbered. Of course, you won't see that in the prologue/epilogue code because the whole D register is saved even if just part of it has been used, but it could cause data-flow related issues elsewhere. in asm statements GCC currently just treats 'q4' and 'd8' as aliases for s16 (which of course is just a 32-bit register); there's currently no way of expressing that a larger entitiy is clobbered. Of course, you won't see that in the prologue/epilogue code because the whole D register is saved even if just part of it has been used, but it could cause data-flow related issues elsewhere. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42321
