strcmp.c

	/* strcmp: return <0 if s<t, 0 if s==t, >0 if s>t */
	int strcmp(char *s, char *t)
	{
		for (; *s == *t ; s++, t++)
			if (*s == '\0')
				return 0;
		return *s - *t;
	}


strcmp.s (gcc-3.3.3)

		.file	"strcmp.c"
		.text
	.globl strcmp
		.type	strcmp, @function
	strcmp:
		pushl	%ebp
		movl	%esp, %ebp
		subl	$4, %esp
		nop
	.L2:
		movl	8(%ebp), %eax
		movl	12(%ebp), %edx
		movb	(%eax), %al
		cmpb	(%edx), %al
		je	.L5
		jmp	.L3
	.L5:
		movl	8(%ebp), %eax
		cmpb	$0, (%eax)
		jne	.L4
		movl	$0, -4(%ebp)
		jmp	.L1
	.L4:
		incl	8(%ebp)
		leal	12(%ebp), %eax
		incl	(%eax)
		jmp	.L2
	.L3:
		movl	8(%ebp), %eax
		movsbl	(%eax),%eax
		movl	12(%ebp), %edx
		movsbl	(%edx),%edx
		subl	%edx, %eax
		movl	%eax, -4(%ebp)
	.L1:
		movl	-4(%ebp), %eax
		leave
		ret
		.size	strcmp, .-strcmp
		.section	.note.GNU-stack,"",@progbits
		.ident	"GCC: (GNU) 3.3.3 20040412 (Red Hat Linux 3.3.3-7)"


strcmp.s (gcc-4.4.5)

		.file	"strcmp.c"
		.text
	.globl strcmp
		.type	strcmp, @function
	strcmp:
		pushl	%ebp
		movl	%esp, %ebp
		jmp	.L2
	.L5:
		movl	8(%ebp), %eax
		movzbl	(%eax), %eax
		testb	%al, %al
		jne	.L3
		movl	$0, %eax
		jmp	.L4
	.L3:
		addl	$1, 8(%ebp)
		addl	$1, 12(%ebp)
	.L2:
		movl	8(%ebp), %eax
		movzbl	(%eax), %edx
		movl	12(%ebp), %eax
		movzbl	(%eax), %eax
		cmpb	%al, %dl
		je	.L5
		movl	8(%ebp), %eax
		movzbl	(%eax), %eax
		movsbl	%al,%edx
		movl	12(%ebp), %eax
		movzbl	(%eax), %eax
		movsbl	%al,%eax
		movl	%edx, %ecx
		subl	%eax, %ecx
		movl	%ecx, %eax
	.L4:
		popl	%ebp
		ret
		.size	strcmp, .-strcmp
		.ident	"GCC: (Debian 4.4.5-8) 4.4.5"
		.section	.note.GNU-stack,"",@progbits