b.S:
__________________________
xor eax, eax
cmp byte[si], 0x80
cmp word[di], 0x0deeb
jz here
here: cld
repz stosw

__________________________
cmdline:
nasm -l elf b.S -o fff
objdump -D fff:
Disassembly of section .text:

00000000 <here-0xe>:
0: 31 c0 xor %eax,%eax
2: 67 80 3c 80 addr16 cmpb $0x80,(%si)
6: 66 67 81 3d eb de addr16 cmpw $0xdeeb,(%di)
c: 74 00 je e <here>

0000000e <here>:
e: fc cld
f: f3 66 ab repz stos %ax,%es:(%edi)


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