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27
28#include <stdlib.h>
29
30#include "src/v8.h"
31
32#include "src/base/platform/platform.h"
33#include "src/diy-fp.h"
34#include "test/cctest/cctest.h"
35
36
37using namespace v8::internal;
38
39
40TEST(Subtract) {
41  DiyFp diy_fp1 = DiyFp(3, 0);
42  DiyFp diy_fp2 = DiyFp(1, 0);
43  DiyFp diff = DiyFp::Minus(diy_fp1, diy_fp2);
44
45  CHECK(2 == diff.f());  // NOLINT
46  CHECK_EQ(0, diff.e());
47  diy_fp1.Subtract(diy_fp2);
48  CHECK(2 == diy_fp1.f());  // NOLINT
49  CHECK_EQ(0, diy_fp1.e());
50}
51
52
53TEST(Multiply) {
54  DiyFp diy_fp1 = DiyFp(3, 0);
55  DiyFp diy_fp2 = DiyFp(2, 0);
56  DiyFp product = DiyFp::Times(diy_fp1, diy_fp2);
57
58  CHECK(0 == product.f());  // NOLINT
59  CHECK_EQ(64, product.e());
60  diy_fp1.Multiply(diy_fp2);
61  CHECK(0 == diy_fp1.f());  // NOLINT
62  CHECK_EQ(64, diy_fp1.e());
63
64  diy_fp1 = DiyFp(V8_2PART_UINT64_C(0x80000000, 00000000), 11);
65  diy_fp2 = DiyFp(2, 13);
66  product = DiyFp::Times(diy_fp1, diy_fp2);
67  CHECK(1 == product.f());  // NOLINT
68  CHECK_EQ(11 + 13 + 64, product.e());
69
70  // Test rounding.
71  diy_fp1 = DiyFp(V8_2PART_UINT64_C(0x80000000, 00000001), 11);
72  diy_fp2 = DiyFp(1, 13);
73  product = DiyFp::Times(diy_fp1, diy_fp2);
74  CHECK(1 == product.f());  // NOLINT
75  CHECK_EQ(11 + 13 + 64, product.e());
76
77  diy_fp1 = DiyFp(V8_2PART_UINT64_C(0x7fffffff, ffffffff), 11);
78  diy_fp2 = DiyFp(1, 13);
79  product = DiyFp::Times(diy_fp1, diy_fp2);
80  CHECK(0 == product.f());  // NOLINT
81  CHECK_EQ(11 + 13 + 64, product.e());
82
83  // Halfway cases are allowed to round either way. So don't check for it.
84
85  // Big numbers.
86  diy_fp1 = DiyFp(V8_2PART_UINT64_C(0xFFFFFFFF, FFFFFFFF), 11);
87  diy_fp2 = DiyFp(V8_2PART_UINT64_C(0xFFFFFFFF, FFFFFFFF), 13);
88  // 128bit result: 0xfffffffffffffffe0000000000000001
89  product = DiyFp::Times(diy_fp1, diy_fp2);
90  CHECK(V8_2PART_UINT64_C(0xFFFFFFFF, FFFFFFFe) == product.f());
91  CHECK_EQ(11 + 13 + 64, product.e());
92}
93