a0ee07829a
This brings us up to date with FreeBSD HEAD, fixes various bugs, unifies the set of functions we support on ARM, MIPS, and x86, fixes "long double", adds ISO C99 support, and adds basic unit tests. It turns out that our "long double" functions have always been broken for non-normal numbers. This patch fixes that by not using the upstream implementations and just forwarding to the regular "double" implementation instead (since "long double" on Android is just "double" anyway, which is what BSD doesn't support). All the tests pass on ARM, MIPS, and x86, plus glibc on x86-64. Bug: 3169850 Bug: 8012787 Bug: https://code.google.com/p/android/issues/detail?id=6697 Change-Id: If0c343030959c24bfc50d4d21c9530052c581837
85 lines
2.4 KiB
C++
85 lines
2.4 KiB
C++
/*
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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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TEST(fenv, FE_DFL_ENV_macro) {
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ASSERT_EQ(0, fesetenv(FE_DFL_ENV));
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}
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