if want, got = a^c32a, xor32(a); got != want {
		panic(fmt.Sprintf("xor32(%x) = %x, want %x", a, got, want))
	}
	if want, got = c32a-a, subr32a(a); got != want {
		panic(fmt.Sprintf("subr32a(%x) = %x, want %x", a, got, want))
	}
	if want, got = c32s-a, subr32s(a); got != want {
		panic(fmt.Sprintf("subr32s(%x) = %x, want %x", a, got, want))
	}
	if want, got = a&^c32a, bic32(a); got != want {

func ExampleSub32() {
	// First number is 33<<32 + 23
	n1 := []uint32{33, 23}
	// Second number is 21<<32 + 12
	n2 := []uint32{21, 12}
	// Sub them together without producing carry.
	d1, carry := bits.Sub32(n1[1], n2[1], 0)
	d0, _ := bits.Sub32(n1[0], n2[0], carry)
	nsum := []uint32{d0, d1}
	fmt.Printf("%v - %v = %v (carry bit was %v)\n", n1, n2, nsum, carry)

	// First number is 3<<32 + 2147483647
	n1 = []uint32{3, 0x7fffffff}

	inf := 1.0 / zero
	negZero := -1 / inf
	if 1/add32(negZero) != inf {
		panic("negZero+0 != posZero (32 bit)")
	}
}

//go:noinline
func sub32(x float32) float32 {
	return x - 0
}

func testSub32() {
	var zero float32
	inf := 1.0 / zero
	negZero := -1 / inf
	if 1/sub32(negZero) != -inf {
		panic("negZero-0 != negZero (32 bit)")
	}
}

//go:noinline
func neg32(x float32) float32 {
	return -x
}