%d + %d*(2**64)", r.lo, r.hi) } a = uint64(1125899906842661) b = uint64(2097155) r = mul64(a, b) r = addMul64(r, a, b) r = addMul64(r, a, b) r = addMul64(r, a, b) r = addMul64(r, a, b) if r.lo != 16888498990613035 || r.hi != 640 { t.Errorf("wrong answer: %d + %d*(2**64)", r.lo, r.hi) } } func TestSetBytesRoundTri(t *testing.T) { f1 := func(in [32]byte, fe Element) bool { fe.SetBytes(in[:]) // Mask the most significant bit as it's ignored by SetBytes. (Now // instead of earlier so we check the masking...