t.Errorf("TrailingZeros64(%d)=%d, want %d", x, got, i)
		}
	}
}
func TestTrailingZeros32(t *testing.T) {
	for i := 0; i <= 32; i++ {
		x := uint32(5) << uint(i)
		if got := sys.TrailingZeros32(x); got != i {
			t.Errorf("TrailingZeros32(%d)=%d, want %d", x, got, i)
		}
	}
}

func TestBswap64(t *testing.T) {
	x := uint64(0x1122334455667788)
	y := sys.Bswap64(x)
	if y != 0x8877665544332211 {

			prod = uint64(v) * uint64(n)
			low = uint32(prod)
		}
	}
	return uint32(prod >> 32)
}

// exp2 generates n with probability 1/2^(n+1).
func (r *pcgRand) exp2() int {
	return bits.TrailingZeros32(r.uint32())
}

// bool generates a random bool.
func (r *pcgRand) bool() bool {
	return r.uint32()&1 == 0
}

// noCopy may be embedded into structs which must not be copied
// after the first use.

		},
		{
			name: "TrailingZeros",
			in:   14,
			out:  [4]any{bits.TrailingZeros8(14), bits.TrailingZeros16(14), bits.TrailingZeros32(14), bits.TrailingZeros64(14)},
		},
		{
			name: "OnesCount",
			in:   14,
			out:  [4]any{bits.OnesCount8(14), bits.OnesCount16(14), bits.OnesCount32(14), bits.OnesCount64(14)},
		},
		{