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/*
* Copyright (C) 2012 Intel Corporation
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include <wtf/MathExtras.h>
namespace TestWebKitAPI {
TEST(WTF, Lrint)
{
EXPECT_EQ(lrint(-7.5), -8);
EXPECT_EQ(lrint(-8.5), -8);
EXPECT_EQ(lrint(-0.5), 0);
EXPECT_EQ(lrint(0.5), 0);
EXPECT_EQ(lrint(-0.5), 0);
EXPECT_EQ(lrint(1.3), 1);
EXPECT_EQ(lrint(1.7), 2);
EXPECT_EQ(lrint(0), 0);
EXPECT_EQ(lrint(-0), 0);
if (sizeof(long int) == 8) {
// Largest double number with 0.5 precision and one halfway rounding case below.
EXPECT_EQ(lrint(pow(2.0, 52) - 0.5), pow(2.0, 52));
EXPECT_EQ(lrint(pow(2.0, 52) - 1.5), pow(2.0, 52) - 2);
// Smallest double number with 0.5 precision and one halfway rounding case above.
EXPECT_EQ(lrint(-pow(2.0, 52) + 0.5), -pow(2.0, 52));
EXPECT_EQ(lrint(-pow(2.0, 52) + 1.5), -pow(2.0, 52) + 2);
}
}
TEST(WTF, clampToIntLong)
{
if (sizeof(long) == sizeof(int))
return;
long maxInt = std::numeric_limits<int>::max();
long minInt = std::numeric_limits<int>::min();
long overflowInt = maxInt + 1;
long underflowInt = minInt - 1;
EXPECT_GT(overflowInt, maxInt);
EXPECT_LT(underflowInt, minInt);
EXPECT_EQ(clampTo<int>(maxInt), maxInt);
EXPECT_EQ(clampTo<int>(minInt), minInt);
EXPECT_EQ(clampTo<int>(overflowInt), maxInt);
EXPECT_EQ(clampTo<int>(underflowInt), minInt);
}
TEST(WTF, clampToIntLongLong)
{
long long maxInt = std::numeric_limits<int>::max();
long long minInt = std::numeric_limits<int>::min();
long long overflowInt = maxInt + 1;
long long underflowInt = minInt - 1;
EXPECT_GT(overflowInt, maxInt);
EXPECT_LT(underflowInt, minInt);
EXPECT_EQ(clampTo<int>(maxInt), maxInt);
EXPECT_EQ(clampTo<int>(minInt), minInt);
EXPECT_EQ(clampTo<int>(overflowInt), maxInt);
EXPECT_EQ(clampTo<int>(underflowInt), minInt);
}
TEST(WTF, clampToIntegerFloat)
{
// This test is inaccurate as floats will round the min / max integer
// due to the narrow mantissa. However it will properly checks within
// (close to the extreme) and outside the integer range.
float maxInt = std::numeric_limits<int>::max();
float minInt = std::numeric_limits<int>::min();
float overflowInt = maxInt * 1.1;
float underflowInt = minInt * 1.1;
EXPECT_GT(overflowInt, maxInt);
EXPECT_LT(underflowInt, minInt);
// If maxInt == 2^31 - 1 (ie on I32 architecture), the closest float used to represent it is 2^31.
EXPECT_NEAR(clampToInteger(maxInt), maxInt, 1);
EXPECT_EQ(clampToInteger(minInt), minInt);
EXPECT_NEAR(clampToInteger(overflowInt), maxInt, 1);
EXPECT_EQ(clampToInteger(underflowInt), minInt);
}
TEST(WTF, clampToIntegerDouble)
{
double maxInt = std::numeric_limits<int>::max();
double minInt = std::numeric_limits<int>::min();
double overflowInt = maxInt + 1;
double underflowInt = minInt - 1;
EXPECT_GT(overflowInt, maxInt);
EXPECT_LT(underflowInt, minInt);
EXPECT_EQ(clampToInteger(maxInt), maxInt);
EXPECT_EQ(clampToInteger(minInt), minInt);
EXPECT_EQ(clampToInteger(overflowInt), maxInt);
EXPECT_EQ(clampToInteger(underflowInt), minInt);
}
TEST(WTF, clampToFloat)
{
double maxFloat = std::numeric_limits<float>::max();
double minFloat = -maxFloat;
double overflowFloat = maxFloat * 1.1;
double underflowFloat = minFloat * 1.1;
EXPECT_GT(overflowFloat, maxFloat);
EXPECT_LT(underflowFloat, minFloat);
EXPECT_EQ(clampToFloat(maxFloat), maxFloat);
EXPECT_EQ(clampToFloat(minFloat), minFloat);
EXPECT_EQ(clampToFloat(overflowFloat), maxFloat);
EXPECT_EQ(clampToFloat(underflowFloat), minFloat);
EXPECT_EQ(clampToFloat(std::numeric_limits<float>::infinity()), maxFloat);
EXPECT_EQ(clampToFloat(-std::numeric_limits<float>::infinity()), minFloat);
}
TEST(WTF, clampToUnsignedLong)
{
if (sizeof(unsigned long) == sizeof(unsigned))
return;
unsigned long maxUnsigned = std::numeric_limits<unsigned>::max();
unsigned long overflowUnsigned = maxUnsigned + 1;
EXPECT_GT(overflowUnsigned, maxUnsigned);
EXPECT_EQ(clampTo<unsigned>(maxUnsigned), maxUnsigned);
EXPECT_EQ(clampTo<unsigned>(overflowUnsigned), maxUnsigned);
EXPECT_EQ(clampTo<unsigned>(-1), 0u);
}
TEST(WTF, clampToUnsignedLongLong)
{
unsigned long long maxUnsigned = std::numeric_limits<unsigned>::max();
unsigned long long overflowUnsigned = maxUnsigned + 1;
EXPECT_GT(overflowUnsigned, maxUnsigned);
EXPECT_EQ(clampTo<unsigned>(maxUnsigned), maxUnsigned);
EXPECT_EQ(clampTo<unsigned>(overflowUnsigned), maxUnsigned);
EXPECT_EQ(clampTo<unsigned>(-1), 0u);
}
TEST(WTF, roundUpToPowerOfTwo)
{
EXPECT_EQ(WTF::roundUpToPowerOfTwo(UINT32_MAX), 0U);
EXPECT_EQ(WTF::roundUpToPowerOfTwo(1U << 31), (1U << 31));
EXPECT_EQ(WTF::roundUpToPowerOfTwo((1U << 31) + 1), 0U);
}
} // namespace TestWebKitAPI