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 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 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 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 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 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 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 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 83 TEST(fenv, FE_DFL_ENV_macro) { 84 ASSERT_EQ(0, fesetenv(FE_DFL_ENV)); 85 } 86
