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

func memhash64Fallback(p unsafe.Pointer, seed uintptr) uintptr {
	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)

	}

	return mix(m5^s, mix(a^hashkey[1], b^seed))
}

func memhash32Fallback(p unsafe.Pointer, seed uintptr) uintptr {
	a := r4(p)
	return mix(m5^4, mix(a^hashkey[1], a^seed^hashkey[0]))
}

func memhash64Fallback(p unsafe.Pointer, seed uintptr) uintptr {
	a := r8(p)
	return mix(m5^8, mix(a^hashkey[1], a^seed^hashkey[0]))
}

func mix(a, b uintptr) uintptr {
	hi, lo := math.Mul64(uint64(a), uint64(b))