// Copyright 2013 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// Routines that are implemented in assembly in asm_{amd64,386}.s
// but are implemented in Go for arm.

// +build arm ppc64 ppc64le

package runtime

func cmpstring(s1, s2 string) int {
	l := len(s1)
	if len(s2) < l {
		l = len(s2)
	}
	for i := 0; i < l; i++ {
		c1, c2 := s1[i], s2[i]
		if c1 < c2 {
			return -1
		}
		if c1 > c2 {
			return +1
		}
	}
	if len(s1) < len(s2) {
		return -1
	}
	if len(s1) > len(s2) {
		return +1
	}
	return 0
}

func cmpbytes(s1, s2 []byte) int {
	l := len(s1)
	if len(s2) < l {
		l = len(s2)
	}
	for i := 0; i < l; i++ {
		c1, c2 := s1[i], s2[i]
		if c1 < c2 {
			return -1
		}
		if c1 > c2 {
			return +1
		}
	}
	if len(s1) < len(s2) {
		return -1
	}
	if len(s1) > len(s2) {
		return +1
	}
	return 0
}
