a, b := mix32(uint32(seed), uint32(8^hashkey[0]))
	a ^= readUnaligned32(p)
	b ^= readUnaligned32(add(p, 4))
	a, b = mix32(a, b)
	a, b = mix32(a, b)
	return uintptr(a ^ b)
}

func memhashFallback(p unsafe.Pointer, seed, s uintptr) uintptr {

	a, b := mix32(uint32(seed), uint32(s^hashkey[0]))
	if s == 0 {
		return uintptr(a ^ b)
	}
	for ; s > 8; s -= 8 {
		a ^= readUnaligned32(p)

package runtime

import (
	"runtime/internal/math"
	"unsafe"
)

const (
	m5 = 0x1d8e4e27c47d124f
)

func memhashFallback(p unsafe.Pointer, seed, s uintptr) uintptr {
	var a, b uintptr
	seed ^= hashkey[0]
	switch {
	case s == 0:
		return seed
	case s < 4:
		a = uintptr(*(*byte)(p))
		a |= uintptr(*(*byte)(add(p, s>>1))) << 8

// See go.dev/issue/67401.
//
//go:linkname strhash
func strhash(p unsafe.Pointer, h uintptr) uintptr

func strhashFallback(a unsafe.Pointer, h uintptr) uintptr {
	x := (*stringStruct)(a)
	return memhashFallback(x.str, h, uintptr(x.len))
}

// NOTE: Because NaN != NaN, a map can contain any
// number of (mostly useless) entries keyed with NaNs.
// To avoid long hash chains, we assign a random number

func TestMemHashGlobalSeed(t *testing.T) {
	if os.Getenv("GO_TEST_SUBPROCESS_HASH") != "" {
		fmt.Println(computeHash())
		os.Exit(0)
		return
	}

	testenv.MustHaveExec(t)

	// aeshash and memhashFallback use separate per-process seeds, so test
	// both.
	t.Run("aes", func(t *testing.T) {
		if !*runtime.UseAeshash {
			t.Skip("No AES")
		}

		h1 := subprocessHash(t, "")
		t.Logf("%d", h1)