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
|
/*
* Copyright (C) 2012 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <gtest/gtest.h>
#include <fenv.h>
#include <stdint.h>
static void TestRounding(float expectation1, float expectation2) {
// volatile to prevent compiler optimizations.
volatile float f = 1.968750f;
volatile float m = 0x1.0p23f;
volatile float x = f + m;
ASSERT_FLOAT_EQ(expectation1, x);
x -= m;
ASSERT_EQ(expectation2, x);
}
static void DivideByZero() {
// volatile to prevent compiler optimizations.
volatile float zero = 0.0f;
volatile float result __attribute__((unused)) = 123.0f / zero;
}
TEST(fenv, fesetround_fegetround_FE_TONEAREST) {
fesetround(FE_TONEAREST);
ASSERT_EQ(FE_TONEAREST, fegetround());
TestRounding(8388610.0f, 2.0f);
}
TEST(fenv, fesetround_fegetround_FE_TOWARDZERO) {
fesetround(FE_TOWARDZERO);
ASSERT_EQ(FE_TOWARDZERO, fegetround());
TestRounding(8388609.0f, 1.0f);
}
TEST(fenv, fesetround_fegetround_FE_UPWARD) {
fesetround(FE_UPWARD);
ASSERT_EQ(FE_UPWARD, fegetround());
TestRounding(8388610.0f, 2.0f);
}
TEST(fenv, fesetround_fegetround_FE_DOWNWARD) {
fesetround(FE_DOWNWARD);
ASSERT_EQ(FE_DOWNWARD, fegetround());
TestRounding(8388609.0f, 1.0f);
}
TEST(fenv, feclearexcept_fetestexcept) {
// Clearing clears.
feclearexcept(FE_ALL_EXCEPT);
ASSERT_EQ(0, fetestexcept(FE_ALL_EXCEPT));
// Dividing by zero sets FE_DIVBYZERO.
DivideByZero();
int raised = fetestexcept(FE_DIVBYZERO | FE_OVERFLOW);
ASSERT_TRUE((raised & FE_OVERFLOW) == 0);
ASSERT_TRUE((raised & FE_DIVBYZERO) != 0);
// Clearing an unset bit is a no-op.
feclearexcept(FE_OVERFLOW);
ASSERT_TRUE((raised & FE_OVERFLOW) == 0);
ASSERT_TRUE((raised & FE_DIVBYZERO) != 0);
// Clearing a set bit works.
feclearexcept(FE_DIVBYZERO);
ASSERT_EQ(0, fetestexcept(FE_ALL_EXCEPT));
}
TEST(fenv, FE_DFL_ENV_macro) {
ASSERT_EQ(0, fesetenv(FE_DFL_ENV));
}
|
