main.s

; output of gcc -O2 -s -S main.c
  .file	"main.c"
	.text
	.p2align 4,,15
	.globl	abs
	.type	abs, @function
abs:
.LFB0:
	.cfi_startproc
	movl	%edi, %edx
	movl	%edi, %eax
	sarl	$31, %edx
	xorl	%edx, %eax
	subl	%edx, %eax
	ret
	.cfi_endproc
.LFE0:
	.size	abs, .-abs
	.p2align 4,,15
	.globl	abs2
	.type	abs2, @function
abs2:
.LFB1:
	.cfi_startproc
	movl	%edi, %edx
	movl	%edi, %eax
	sarl	$31, %edx
	xorl	%edx, %eax
	subl	%edx, %eax
	ret
	.cfi_endproc
.LFE1:
	.size	abs2, .-abs2
	.section	.text.startup,"ax",@progbits
	.p2align 4,,15
	.globl	main
	.type	main, @function
main:
.LFB2:
	.cfi_startproc
	rep ret
	.cfi_endproc
.LFE2:
	.size	main, .-main
	.ident	"GCC: (Ubuntu 4.8.4-2ubuntu1~14.04.3) 4.8.4"
	.section	.note.GNU-stack,"",@progbits