Mark Dickinson <dicki...@gmail.com> added the comment:

Here's a relevant gcc bug report:

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21249

As I understand it, the rules are that in 32-bit mode "A" means edx/eax 
for a 64-bit quantity, and in 64-bit mode "A" means rdx/rax for a 128-bit 
quantity and "rdx or rax" for a 64-bit quantity.

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