[Bug c/53353] Missing error/warning when using __int128_t with incorrect asm register constraints

["jakub at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

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.