* x86_64/aes-decrypt-internal.asm: Rearrange register allocation.
Put SA--SD in %eax--%edx, so the second byte can be accessed as %ah-%dh. TD is not needed, SD can be reused. Use the register that is saved for the outer loop counter, getting it off the stack. * x86_64/aes-encrypt-internal.asm: Likewise. * x86_64/aes.m4 (HREG, MOVE_HREG): New macros. (XREG): Fixed bug in handling of %r8 and %r9. (AES_ROUND): Use MOVE_HREG. Rev: nettle/x86_64/aes-decrypt-internal.asm:1.2 Rev: nettle/x86_64/aes-encrypt-internal.asm:1.9 Rev: nettle/x86_64/aes.m4:1.6
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