}

func TestMulUintptr(t *testing.T) {
	for _, test := range mulUintptrTests {
		a, b := test.a, test.b
		for i := 0; i < 2; i++ {
			mul, overflow := MulUintptr(a, b)
			if mul != a*b || overflow != test.overflow {
				t.Errorf("MulUintptr(%v, %v) = %v, %v want %v, %v",
					a, b, mul, overflow, a*b, test.overflow)
			}
			a, b = b, a
		}
	}
}

var SinkUintptr uintptr
var SinkBool bool

// license that can be found in the LICENSE file.

package math

import "internal/goarch"

const MaxUintptr = ^uintptr(0)

// MulUintptr returns a * b and whether the multiplication overflowed.
// On supported platforms this is an intrinsic lowered by the compiler.
func MulUintptr(a, b uintptr) (uintptr, bool) {
	if a|b < 1<<(4*goarch.PtrSize) || a == 0 {
		return a * b, false
	}
	overflow := b > MaxUintptr/a

func makeslicecopy(et *_type, tolen int, fromlen int, from unsafe.Pointer) unsafe.Pointer {
	var tomem, copymem uintptr
	if uintptr(tolen) > uintptr(fromlen) {
		var overflow bool
		tomem, overflow = math.MulUintptr(et.Size_, uintptr(tolen))
		if overflow || tomem > maxAlloc || tolen < 0 {
			panicmakeslicelen()
		}
		copymem = et.Size_ * uintptr(fromlen)
	} else {

	if len < 0 {
		panicunsafeslicelen1(getcallerpc())
	}

	if et.Size_ == 0 {
		if ptr == nil && len > 0 {
			panicunsafeslicenilptr1(getcallerpc())
		}
	}

	mem, overflow := math.MulUintptr(et.Size_, uintptr(len))
	if overflow || mem > -uintptr(ptr) {
		if ptr == nil {
			panicunsafeslicenilptr1(getcallerpc())
		}
		panicunsafeslicelen1(getcallerpc())
	}
}

			"(*puintptr).set",
			"(*wbBuf).get1",
			"(*wbBuf).get2",

			// Trace-related ones.
			"traceLocker.ok",
			"traceEnabled",
		},
		"runtime/internal/sys": {},
		"runtime/internal/math": {
			"MulUintptr",
		},
		"bytes": {
			"(*Buffer).Bytes",
			"(*Buffer).Cap",
			"(*Buffer).Len",
			"(*Buffer).Grow",
			"(*Buffer).Next",
			"(*Buffer).Read",
			"(*Buffer).ReadByte",
			"(*Buffer).Reset",

				typecheck.Conv(len, types.Types[types.TINT]),
				typecheck.Conv(len, types.Types[types.TINT]))
			return walkExpr(typecheck.Expr(h), init)
		}

		// mem, overflow := math.mulUintptr(et.size, len)
		mem := typecheck.TempAt(base.Pos, ir.CurFunc, types.Types[types.TUINTPTR])
		overflow := typecheck.TempAt(base.Pos, ir.CurFunc, types.Types[types.TBOOL])

		decl := types.NewSignature(nil,

	if elem.Size_ >= 1<<16 {
		throw("makechan: invalid channel element type")
	}
	if hchanSize%maxAlign != 0 || elem.Align_ > maxAlign {
		throw("makechan: bad alignment")
	}

	mem, overflow := math.MulUintptr(elem.Size_, uintptr(size))
	if overflow || mem > maxAlloc-hchanSize || size < 0 {
		panic(plainError("makechan: size out of range"))
	}

// heap bitmap for n consecutive values with type typ allocated at address ptr.
func userArenaHeapBitsSetSliceType(typ *_type, n int, ptr unsafe.Pointer, s *mspan) {
	mem, overflow := math.MulUintptr(typ.Size_, uintptr(n))
	if overflow || n < 0 || mem > maxAlloc {
		panic(plainError("runtime: allocation size out of range"))
	}
	for i := 0; i < n; i++ {

// See go.dev/issue/67401.
//
//go:linkname newarray
func newarray(typ *_type, n int) unsafe.Pointer {
	if n == 1 {
		return mallocgc(typ.Size_, typ, true)
	}
	mem, overflow := math.MulUintptr(typ.Size_, uintptr(n))
	if overflow || mem > maxAlloc || n < 0 {
		panic(plainError("runtime: allocation size out of range"))
	}
	return mallocgc(mem, typ, true)
}

//   - github.com/ugorji/go/codec
//
// Do not remove or change the type signature.
// See go.dev/issue/67401.
//
//go:linkname makemap
func makemap(t *maptype, hint int, h *hmap) *hmap {
	mem, overflow := math.MulUintptr(uintptr(hint), t.Bucket.Size_)
	if overflow || mem > maxAlloc {
		hint = 0
	}

	// initialize Hmap
	if h == nil {
		h = new(hmap)
	}
	h.hash0 = uint32(rand())