1// Copyright 2018 The Go Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style
3// license that can be found in the LICENSE file.
4
5package math
6
7import "runtime/internal/sys"
8
9const MaxUintptr = ^uintptr(0)
10
11// MulUintptr returns a * b and whether the multiplication overflowed.
12// On supported platforms this is an intrinsic lowered by the compiler.
13func MulUintptr(a, b uintptr) (uintptr, bool) {
14	if a|b < 1<<(4*sys.PtrSize) || a == 0 {
15		return a * b, false
16	}
17	overflow := b > MaxUintptr/a
18	return a * b, overflow
19}
20