1 /*
2 * Copyright (C) 2012 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include <gtest/gtest.h>
18
19 #include <fenv.h>
20 #include <stdint.h>
21
TestRounding(float expectation1,float expectation2)22 static void TestRounding(float expectation1, float expectation2) {
23 // volatile to prevent compiler optimizations.
24 volatile float f = 1.968750f;
25 volatile float m = 0x1.0p23f;
26 volatile float x = f + m;
27 ASSERT_FLOAT_EQ(expectation1, x);
28 x -= m;
29 ASSERT_EQ(expectation2, x);
30 }
31
DivideByZero()32 static void DivideByZero() {
33 // volatile to prevent compiler optimizations.
34 volatile float zero = 0.0f;
35 volatile float result __attribute__((unused)) = 123.0f / zero;
36 }
37
TEST(fenv,fesetround_fegetround_FE_TONEAREST)38 TEST(fenv, fesetround_fegetround_FE_TONEAREST) {
39 fesetround(FE_TONEAREST);
40 ASSERT_EQ(FE_TONEAREST, fegetround());
41 TestRounding(8388610.0f, 2.0f);
42 }
43
TEST(fenv,fesetround_fegetround_FE_TOWARDZERO)44 TEST(fenv, fesetround_fegetround_FE_TOWARDZERO) {
45 fesetround(FE_TOWARDZERO);
46 ASSERT_EQ(FE_TOWARDZERO, fegetround());
47 TestRounding(8388609.0f, 1.0f);
48 }
49
TEST(fenv,fesetround_fegetround_FE_UPWARD)50 TEST(fenv, fesetround_fegetround_FE_UPWARD) {
51 fesetround(FE_UPWARD);
52 ASSERT_EQ(FE_UPWARD, fegetround());
53 TestRounding(8388610.0f, 2.0f);
54 }
55
TEST(fenv,fesetround_fegetround_FE_DOWNWARD)56 TEST(fenv, fesetround_fegetround_FE_DOWNWARD) {
57 fesetround(FE_DOWNWARD);
58 ASSERT_EQ(FE_DOWNWARD, fegetround());
59 TestRounding(8388609.0f, 1.0f);
60 }
61
TEST(fenv,feclearexcept_fetestexcept)62 TEST(fenv, feclearexcept_fetestexcept) {
63 // Clearing clears.
64 feclearexcept(FE_ALL_EXCEPT);
65 ASSERT_EQ(0, fetestexcept(FE_ALL_EXCEPT));
66
67 // Dividing by zero sets FE_DIVBYZERO.
68 DivideByZero();
69 int raised = fetestexcept(FE_DIVBYZERO | FE_OVERFLOW);
70 ASSERT_TRUE((raised & FE_OVERFLOW) == 0);
71 ASSERT_TRUE((raised & FE_DIVBYZERO) != 0);
72
73 // Clearing an unset bit is a no-op.
74 feclearexcept(FE_OVERFLOW);
75 ASSERT_TRUE((raised & FE_OVERFLOW) == 0);
76 ASSERT_TRUE((raised & FE_DIVBYZERO) != 0);
77
78 // Clearing a set bit works.
79 feclearexcept(FE_DIVBYZERO);
80 ASSERT_EQ(0, fetestexcept(FE_ALL_EXCEPT));
81 }
82
TEST(fenv,FE_DFL_ENV_macro)83 TEST(fenv, FE_DFL_ENV_macro) {
84 ASSERT_EQ(0, fesetenv(FE_DFL_ENV));
85 }
86