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Asked: 2026-06-16T02:00:17+00:00

Simple question. I doubt this will receive much attention, but how do I do

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Simple question. I doubt this will receive much attention, but how do I do 3 or 4 parameter operations in x86-64 assembly in AT&T (gAS) syntax? It’s known to any x86 programmer using gAS that the arguments are switched, for example:

xor   eax,  ebx ; Intel (xASM)
xorl %ebx, %eax ; AT&T (gAS)

But how would I do, say:

blendpd xmm0, xmm1, 5

What I mean is, how are the instructions written? I get that there would be %xmm0 and such (still prefixes on parameters), but how are they ordered and what suffix do I add at the end of the instruction (the l in movl for 32-bit)?

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1 Answer

  1. Editorial Team

    The AT&T equivalent would be where the order of operands is reversed:

    blendpd $5, %xmm1, %xmm0

    If you are unsure you can always compile with Intel syntax then disassemble to AT&T.

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