automatic vectorization depending on alignment of the input

vectorization-4.s

_add:
	pushl	%ebp
	movl	%esp, %ebp
	pushl	%esi
	pushl	%ebx
	movl	8(%ebp), %ebx
	movl	12(%ebp), %ecx
	movl	16(%ebp), %edx
	leal	16(%ebx), %esi
	testb	$15, %bl
	je	L13
L2:
	xorl	%eax, %eax
	.p2align 2,,3
L7:
	movss	(%ecx,%eax,4), %xmm0
	addss	(%edx,%eax,4), %xmm0
	movss	%xmm0, (%ebx,%eax,4)
	incl	%eax
	cmpl	$1024, %eax
	jne	L7
	popl	%ebx
	popl	%esi
	leave
	ret
L13:
	leal	16(%ecx), %eax
	cmpl	%eax, %ebx
	jbe	L14
	leal	16(%edx), %eax
	cmpl	%eax, %ebx
	jbe	L15
L9:
	xorl	%eax, %eax
	.p2align 2,,3
L5:
	movlps	(%ecx,%eax), %xmm1
	movhps	8(%ecx,%eax), %xmm1
	movlps	(%edx,%eax), %xmm0
	movhps	8(%edx,%eax), %xmm0
	addps	%xmm0, %xmm1
	movaps	%xmm1, (%ebx,%eax)
	addl	$16, %eax
	cmpl	$4096, %eax
	jne	L5
	popl	%ebx
	popl	%esi
	leave
	ret
L14:
	cmpl	%ecx, %esi
	jae	L2
	leal	16(%edx), %eax
	cmpl	%eax, %ebx
	ja	L9
L15:
	cmpl	%esi, %edx
	jbe	L2
	jmp	L9