fast_abs64.s

	.align 8
	.text
	.globl linux_fast_abs64
linux_fast_abs64:
	movq	%rdi,	%rax	# rax <- x
	sarq	$63,	%rax	# rax <- rax >> 63
	xorq	%rax,	%rdi	# rdi <- rdi ^ rax
	subq	%rax,	%rdi	# rdi <- rdi - rax
	movq	%rdi,	%rax	# rax <- rdi
	retq
	
	.globl windows_fast_abs64
windows_fast_abs64:
	movq	%rcx,	%rax	# rax <- x
	sarq	$63,	%rax	# rax <- rax >> 63
	xorq	%rax,	%rcx	# rcx <- rcx ^ rax
	subq	%rax,	%rcx	# rcx <- rcx - rax
	movq	%rcx,	%rax	# rax <- rcx
	retq