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1 // Copyright 2006-2008 the V8 project authors. All rights reserved.
2 // Redistribution and use in source and binary forms, with or without
3 // modification, are permitted provided that the following conditions are
4 // met:
5 //
6 //     * Redistributions of source code must retain the above copyright
7 //       notice, this list of conditions and the following disclaimer.
8 //     * Redistributions in binary form must reproduce the above
9 //       copyright notice, this list of conditions and the following
10 //       disclaimer in the documentation and/or other materials provided
11 //       with the distribution.
12 //     * Neither the name of Google Inc. nor the names of its
13 //       contributors may be used to endorse or promote products derived
14 //       from this software without specific prior written permission.
15 //
16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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