global _start section .data align 16 quad1: dq 0xccddccddad007fff quad2: dq 0xaabbaabbad007fff quad3: dq 0x00ff00ffad007fff mydword: dd 0xcafebabe myaddress: dq 0x00adbeefc0de00ce %include "header.inc" movq mm0, [quad1] movq mm1, [quad3] movq mm2, [quad2] movq mm3, [quad3] punpckhwd mm0, [myaddress] punpckhwd mm0, mm1 punpckhwd mm1, [quad2] punpckhwd mm2, [quad1] punpckhwd mm3, [quad1] %include "footer.inc"