.include "lib.s"

.globl strlen
strlen:
	prologue

	backup %rdi, %rcx

	movq 16(%rbp), %rdi
	xorq %rax, %rax
	movq $-1, %rcx

	repne scasb

	movq $-2, %rax
	subq %rcx, %rax

	restore %rdi, %rcx

	leave
	ret