1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
|
/*
* Copyright (C) 2012 Intel Corporation
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include <wtf/MathExtras.h>
namespace TestWebKitAPI {
TEST(WTF, Lrint)
{
EXPECT_EQ(lrint(-7.5), -8);
EXPECT_EQ(lrint(-8.5), -8);
EXPECT_EQ(lrint(-0.5), 0);
EXPECT_EQ(lrint(0.5), 0);
EXPECT_EQ(lrint(-0.5), 0);
EXPECT_EQ(lrint(1.3), 1);
EXPECT_EQ(lrint(1.7), 2);
EXPECT_EQ(lrint(0), 0);
EXPECT_EQ(lrint(-0), 0);
if (sizeof(long int) == 8) {
// Largest double number with 0.5 precision and one halfway rounding case below.
EXPECT_EQ(lrint(pow(2.0, 52) - 0.5), pow(2.0, 52));
EXPECT_EQ(lrint(pow(2.0, 52) - 1.5), pow(2.0, 52) - 2);
// Smallest double number with 0.5 precision and one halfway rounding case above.
EXPECT_EQ(lrint(-pow(2.0, 52) + 0.5), -pow(2.0, 52));
EXPECT_EQ(lrint(-pow(2.0, 52) + 1.5), -pow(2.0, 52) + 2);
}
}
TEST(WTF, clampToIntLong)
{
if (sizeof(long) == sizeof(int))
return;
long maxInt = std::numeric_limits<int>::max();
long minInt = std::numeric_limits<int>::min();
long overflowInt = maxInt + 1;
long underflowInt = minInt - 1;
EXPECT_GT(overflowInt, maxInt);
EXPECT_LT(underflowInt, minInt);
EXPECT_EQ(clampTo<int>(maxInt), maxInt);
EXPECT_EQ(clampTo<int>(minInt), minInt);
EXPECT_EQ(clampTo<int>(overflowInt), maxInt);
EXPECT_EQ(clampTo<int>(underflowInt), minInt);
}
TEST(WTF, clampToIntLongLong)
{
long long maxInt = std::numeric_limits<int>::max();
long long minInt = std::numeric_limits<int>::min();
long long overflowInt = maxInt + 1;
long long underflowInt = minInt - 1;
EXPECT_GT(overflowInt, maxInt);
EXPECT_LT(underflowInt, minInt);
EXPECT_EQ(clampTo<int>(maxInt), maxInt);
EXPECT_EQ(clampTo<int>(minInt), minInt);
EXPECT_EQ(clampTo<int>(overflowInt), maxInt);
EXPECT_EQ(clampTo<int>(underflowInt), minInt);
}
TEST(WTF, clampToIntegerFloat)
{
// This test is inaccurate as floats will round the min / max integer
// due to the narrow mantissa. However it will properly checks within
// (close to the extreme) and outside the integer range.
float maxInt = std::numeric_limits<int>::max();
float minInt = std::numeric_limits<int>::min();
float overflowInt = maxInt * 1.1;
float underflowInt = minInt * 1.1;
EXPECT_GT(overflowInt, maxInt);
EXPECT_LT(underflowInt, minInt);
// If maxInt == 2^31 - 1 (ie on I32 architecture), the closest float used to represent it is 2^31.
EXPECT_NEAR(clampToInteger(maxInt), maxInt, 1);
EXPECT_EQ(clampToInteger(minInt), minInt);
EXPECT_NEAR(clampToInteger(overflowInt), maxInt, 1);
EXPECT_EQ(clampToInteger(underflowInt), minInt);
}
TEST(WTF, clampToIntegerDouble)
{
double maxInt = std::numeric_limits<int>::max();
double minInt = std::numeric_limits<int>::min();
double overflowInt = maxInt + 1;
double underflowInt = minInt - 1;
EXPECT_GT(overflowInt, maxInt);
EXPECT_LT(underflowInt, minInt);
EXPECT_EQ(clampToInteger(maxInt), maxInt);
EXPECT_EQ(clampToInteger(minInt), minInt);
EXPECT_EQ(clampToInteger(overflowInt), maxInt);
EXPECT_EQ(clampToInteger(underflowInt), minInt);
}
TEST(WTF, clampToFloat)
{
double maxFloat = std::numeric_limits<float>::max();
double minFloat = -maxFloat;
double overflowFloat = maxFloat * 1.1;
double underflowFloat = minFloat * 1.1;
EXPECT_GT(overflowFloat, maxFloat);
EXPECT_LT(underflowFloat, minFloat);
EXPECT_EQ(clampToFloat(maxFloat), maxFloat);
EXPECT_EQ(clampToFloat(minFloat), minFloat);
EXPECT_EQ(clampToFloat(overflowFloat), maxFloat);
EXPECT_EQ(clampToFloat(underflowFloat), minFloat);
EXPECT_EQ(clampToFloat(std::numeric_limits<float>::infinity()), maxFloat);
EXPECT_EQ(clampToFloat(-std::numeric_limits<float>::infinity()), minFloat);
}
TEST(WTF, clampToUnsignedLong)
{
if (sizeof(unsigned long) == sizeof(unsigned))
return;
unsigned long maxUnsigned = std::numeric_limits<unsigned>::max();
unsigned long overflowUnsigned = maxUnsigned + 1;
EXPECT_GT(overflowUnsigned, maxUnsigned);
EXPECT_EQ(clampTo<unsigned>(maxUnsigned), maxUnsigned);
EXPECT_EQ(clampTo<unsigned>(overflowUnsigned), maxUnsigned);
EXPECT_EQ(clampTo<unsigned>(-1), 0u);
}
TEST(WTF, clampToUnsignedLongLong)
{
unsigned long long maxUnsigned = std::numeric_limits<unsigned>::max();
unsigned long long overflowUnsigned = maxUnsigned + 1;
EXPECT_GT(overflowUnsigned, maxUnsigned);
EXPECT_EQ(clampTo<unsigned>(maxUnsigned), maxUnsigned);
EXPECT_EQ(clampTo<unsigned>(overflowUnsigned), maxUnsigned);
EXPECT_EQ(clampTo<unsigned>(-1), 0u);
}
} // namespace TestWebKitAPI
|
