newline detection

gistfile1.txt

	.file	"hello.c"
	.text
	.p2align 4,,15
.globl find_newline
	.type	find_newline, @function
find_newline:
.LFB3:
	xorl	%edx, %edx
	testq	%rsi, %rsi
	je	.L3
	movzbl	(%rdi), %ecx
	movl	$1, %edx
	cmpb	$10, %cl
	je	.L3
	xorl	%eax, %eax
	cmpb	$13, %cl
	movl	$1, %edx
	jne	.L11
	jmp	.L6
	.p2align 4,,10
.L9:
	movzbl	(%rdi,%rax), %edx
	cmpb	$10, %dl
	je	.L14
	cmpb	$13, %dl
	.p2align 4,,5
	je	.L15
.L11:
	addq	$1, %rax
	cmpq	%rax, %rsi
	ja	.L9
	movq	%rax, %rdx
.L3:
	movq	%rdx, %rax
	.p2align 4,,1
	ret
	.p2align 4,,10
.L15:
	leaq	1(%rax), %rdx
.L6:
	cmpq	%rdx, %rsi
	jbe	.L3
	addq	$2, %rax
	cmpb	$10, (%rdi,%rdx)
	cmove	%rax, %rdx
	movq	%rdx, %rax
	ret
	.p2align 4,,10
.L14:
	leaq	1(%rax), %rdx
	movq	%rdx, %rax
	ret
.LFE3:
	.size	find_newline, .-find_newline
	.section	.eh_frame,"a",@progbits
.Lframe1:
	.long	.LECIE1-.LSCIE1
.LSCIE1:
	.long	0x0
	.byte	0x1
	.string	"zR"
	.uleb128 0x1
	.sleb128 -8
	.byte	0x10
	.uleb128 0x1
	.byte	0x3
	.byte	0xc
	.uleb128 0x7
	.uleb128 0x8
	.byte	0x90
	.uleb128 0x1
	.align 8
.LECIE1:
.LSFDE1:
	.long	.LEFDE1-.LASFDE1
.LASFDE1:
	.long	.LASFDE1-.Lframe1
	.long	.LFB3
	.long	.LFE3-.LFB3
	.uleb128 0x0
	.align 8
.LEFDE1:
	.ident	"GCC: (GNU) 4.3.4 20090621 (prerelease)"