1 // Copyright 2006-2008 the V8 project authors. All rights reserved.
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3 // modification, are permitted provided that the following conditions are
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26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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
37 using namespace v8::internal;
38
39
TEST(Subtract)40 TEST(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
TEST(Multiply)53 TEST(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