// The struct fields x.before and x.after check that the
// operations do not extend past the full word size.

const (
	magic32 = 0xdedbeef
	magic64 = 0xdeddeadbeefbeef
)

func TestSwapInt32(t *testing.T) {
	var x struct {
		before int32
		i      int32
		after  int32
	}
	x.before = magic32
	x.after = magic32
	var j int32
	for delta := int32(1); delta+delta > delta; delta += delta {