90e10d41c4
The old code was one big no-op. Bug: http://code.google.com/p/android/issues/detail?id=38196 Change-Id: I201a6ffa477385b2629f45e8c948bdfbd47b5bf1
82 lines
2.3 KiB
C++
82 lines
2.3 KiB
C++
/*
|
|
* 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));
|
|
}
|