http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53353
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
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CC| |jakub at gcc dot gnu.org
--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> 2012-05-15
06:19:51 UTC ---
You are wrong. "A" class contains the ax and dx registers, which means that
for say 64-bit value it can give you either %rax, or %rdx, for 128-bit value
obviously only %rax:%rdx pair. But "r" class contains all the non-fixed
general purpose registers, so it can give you any pair of consecutive
registers.
The only classes that can't hold 128-bit values are the single register
classes, like "a", "b", ..., "D", "S", etc.
