/usr/share/doc/nasm/examples/mmxsize.asm is in nasm 2.09.10-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 | ;Testname=unoptimized; Arguments=-fbin -ommxsize.bin -O0; Files=stdout stderr mmxsize.bin
;Testname=optimized; Arguments=-fbin -ommxsize.bin -Ox; Files=stdout stderr mmxsize.bin
bits 32
movd mm0,eax
movd mm0,[foo]
movq mm0,[foo]
movd mm0,dword [foo]
movq mm0,qword [foo]
movmskps eax,xmm1
movmskpd eax,xmm1
nop
movd xmm0,eax
movd xmm0,[foo]
movq xmm0,[foo]
movd xmm0,dword [foo]
movq xmm0,qword [foo]
nop
bits 64
movd mm0,eax
movq mm0,[foo]
movd mm0,dword [foo]
movq mm0,qword [foo]
movq mm0,rax
movmskps eax,xmm1
movmskpd eax,xmm1
nop
movd xmm0,eax
movq xmm0,[foo]
movd xmm0,dword [foo]
movq xmm0,qword [foo]
movq xmm0,rax
movmskps rax,xmm1
movmskpd rax,xmm1
nop
section .bss
foo resq 1
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