1// Copyright 2006-2008 the V8 project authors. All rights reserved.
2
3#include <stdlib.h>
4
5#include "v8.h"
6
7#include "platform.h"
8#include "cctest.h"
9#include "diy-fp.h"
10
11
12using namespace v8::internal;
13
14
15TEST(Subtract) {
16  DiyFp diy_fp1 = DiyFp(3, 0);
17  DiyFp diy_fp2 = DiyFp(1, 0);
18  DiyFp diff = DiyFp::Minus(diy_fp1, diy_fp2);
19
20  CHECK(2 == diff.f());  // NOLINT
21  CHECK_EQ(0, diff.e());
22  diy_fp1.Subtract(diy_fp2);
23  CHECK(2 == diy_fp1.f());  // NOLINT
24  CHECK_EQ(0, diy_fp1.e());
25}
26
27
28TEST(Multiply) {
29  DiyFp diy_fp1 = DiyFp(3, 0);
30  DiyFp diy_fp2 = DiyFp(2, 0);
31  DiyFp product = DiyFp::Times(diy_fp1, diy_fp2);
32
33  CHECK(0 == product.f());  // NOLINT
34  CHECK_EQ(64, product.e());
35  diy_fp1.Multiply(diy_fp2);
36  CHECK(0 == diy_fp1.f());  // NOLINT
37  CHECK_EQ(64, diy_fp1.e());
38
39  diy_fp1 = DiyFp(V8_2PART_UINT64_C(0x80000000, 00000000), 11);
40  diy_fp2 = DiyFp(2, 13);
41  product = DiyFp::Times(diy_fp1, diy_fp2);
42  CHECK(1 == product.f());  // NOLINT
43  CHECK_EQ(11 + 13 + 64, product.e());
44
45  // Test rounding.
46  diy_fp1 = DiyFp(V8_2PART_UINT64_C(0x80000000, 00000001), 11);
47  diy_fp2 = DiyFp(1, 13);
48  product = DiyFp::Times(diy_fp1, diy_fp2);
49  CHECK(1 == product.f());  // NOLINT
50  CHECK_EQ(11 + 13 + 64, product.e());
51
52  diy_fp1 = DiyFp(V8_2PART_UINT64_C(0x7fffffff, ffffffff), 11);
53  diy_fp2 = DiyFp(1, 13);
54  product = DiyFp::Times(diy_fp1, diy_fp2);
55  CHECK(0 == product.f());  // NOLINT
56  CHECK_EQ(11 + 13 + 64, product.e());
57
58  // Halfway cases are allowed to round either way. So don't check for it.
59
60  // Big numbers.
61  diy_fp1 = DiyFp(V8_2PART_UINT64_C(0xFFFFFFFF, FFFFFFFF), 11);
62  diy_fp2 = DiyFp(V8_2PART_UINT64_C(0xFFFFFFFF, FFFFFFFF), 13);
63  // 128bit result: 0xfffffffffffffffe0000000000000001
64  product = DiyFp::Times(diy_fp1, diy_fp2);
65  CHECK(V8_2PART_UINT64_C(0xFFFFFFFF, FFFFFFFe) == product.f());
66  CHECK_EQ(11 + 13 + 64, product.e());
67}
68