Source file src/pkg/runtime/internal/math/math.go

     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	
     5	package math
     6	
     7	import "runtime/internal/sys"
     8	
     9	const 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.
    13	func 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	

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