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