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remove superfluous jecxz
.text .global memcmp .type memcmp,function memcmp: pushl %esi pushl %edi xorl %eax,%eax movl %esp,%ecx movl 12(%ecx),%esi movl 16(%ecx),%edi movl 20(%ecx),%ecx cld rep cmpsb jz .Lout sbbl %eax,%eax orl $1,%eax .Lout: popl %edi popl %esi ret .size memcmp,.-memcmp