How do I extract a single byte from an xmm-register in Asm?

Question

I was learning SSE-instructions and found a weird error with GNU's as assembler, when trying to copy a single byte from an xmm-register to al: "Error: operand type mismatch for pextrb".

I think my syntax is right, it works perfectly fine with pextrd.

pextrd $3, %xmm0, %eax  # Works perfectly fine
pextrb $3, %xmm0, %al   # Error: operand type mismatch for 'pextrb'

Answer 1

Marc Glisse is right, it works when using eax instead of al. It is zero-extended, so eax actually contains only the one single byte. Thank you!

pextrb $3, %xmm0, %eax