modff_test.cpp
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//===-- Unittests for modff -----------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "include/math.h"
#include "src/math/modff.h"
#include "utils/FPUtil/BasicOperations.h"
#include "utils/FPUtil/BitPatterns.h"
#include "utils/FPUtil/FloatOperations.h"
#include "utils/FPUtil/FloatProperties.h"
#include "utils/FPUtil/NearestIntegerOperations.h"
#include "utils/UnitTest/Test.h"
using __llvm_libc::fputil::valueAsBits;
using __llvm_libc::fputil::valueFromBits;
using BitPatterns = __llvm_libc::fputil::BitPatterns<float>;
using Properties = __llvm_libc::fputil::FloatProperties<float>;
TEST(ModffTest, SpecialNumbers) {
float integral;
EXPECT_EQ(BitPatterns::aQuietNaN,
valueAsBits(__llvm_libc::modff(
valueFromBits(BitPatterns::aQuietNaN), &integral)));
EXPECT_EQ(BitPatterns::aNegativeQuietNaN,
valueAsBits(__llvm_libc::modff(
valueFromBits(BitPatterns::aNegativeQuietNaN), &integral)));
EXPECT_EQ(BitPatterns::aSignallingNaN,
valueAsBits(__llvm_libc::modff(
valueFromBits(BitPatterns::aSignallingNaN), &integral)));
EXPECT_EQ(
BitPatterns::aNegativeSignallingNaN,
valueAsBits(__llvm_libc::modff(
valueFromBits(BitPatterns::aNegativeSignallingNaN), &integral)));
EXPECT_EQ(BitPatterns::zero,
valueAsBits(__llvm_libc::modff(valueFromBits(BitPatterns::inf),
&integral)));
EXPECT_EQ(valueAsBits(integral), BitPatterns::inf);
EXPECT_EQ(BitPatterns::negZero,
valueAsBits(__llvm_libc::modff(valueFromBits(BitPatterns::negInf),
&integral)));
EXPECT_EQ(valueAsBits(integral), BitPatterns::negInf);
EXPECT_EQ(BitPatterns::zero,
valueAsBits(__llvm_libc::modff(valueFromBits(BitPatterns::zero),
&integral)));
EXPECT_EQ(valueAsBits(integral), BitPatterns::zero);
EXPECT_EQ(BitPatterns::negZero,
valueAsBits(__llvm_libc::modff(valueFromBits(BitPatterns::negZero),
&integral)));
EXPECT_EQ(valueAsBits(integral), BitPatterns::negZero);
}
TEST(ModffTest, Integers) {
float integral;
EXPECT_EQ(BitPatterns::zero,
valueAsBits(__llvm_libc::modff(1.0f, &integral)));
EXPECT_EQ(valueAsBits(integral), valueAsBits(1.0f));
EXPECT_EQ(BitPatterns::negZero,
valueAsBits(__llvm_libc::modff(-1.0f, &integral)));
EXPECT_EQ(valueAsBits(integral), valueAsBits(-1.0f));
EXPECT_EQ(BitPatterns::zero,
valueAsBits(__llvm_libc::modff(10.0f, &integral)));
EXPECT_EQ(valueAsBits(integral), valueAsBits(10.0f));
EXPECT_EQ(BitPatterns::negZero,
valueAsBits(__llvm_libc::modff(-10.0f, &integral)));
EXPECT_EQ(valueAsBits(integral), valueAsBits(-10.0f));
EXPECT_EQ(BitPatterns::zero,
valueAsBits(__llvm_libc::modff(12345.0f, &integral)));
EXPECT_EQ(valueAsBits(integral), valueAsBits(12345.0f));
EXPECT_EQ(BitPatterns::negZero,
valueAsBits(__llvm_libc::modff(-12345.0f, &integral)));
EXPECT_EQ(valueAsBits(integral), valueAsBits(-12345.0f));
}
TEST(ModffTest, Fractions) {
float integral;
EXPECT_EQ(valueAsBits(0.5f),
valueAsBits(__llvm_libc::modff(1.5f, &integral)));
EXPECT_EQ(valueAsBits(integral), valueAsBits(1.0f));
EXPECT_EQ(valueAsBits(-0.5f),
valueAsBits(__llvm_libc::modff(-1.5f, &integral)));
EXPECT_EQ(valueAsBits(integral), valueAsBits(-1.0f));
EXPECT_EQ(valueAsBits(0.75f),
valueAsBits(__llvm_libc::modff(10.75f, &integral)));
EXPECT_EQ(valueAsBits(integral), valueAsBits(10.0f));
EXPECT_EQ(valueAsBits(-0.75f),
valueAsBits(__llvm_libc::modff(-10.75f, &integral)));
EXPECT_EQ(valueAsBits(integral), valueAsBits(-10.0f));
EXPECT_EQ(valueAsBits(0.125f),
valueAsBits(__llvm_libc::modff(100.125f, &integral)));
EXPECT_EQ(valueAsBits(integral), valueAsBits(100.0f));
EXPECT_EQ(valueAsBits(-0.125f),
valueAsBits(__llvm_libc::modff(-100.125f, &integral)));
EXPECT_EQ(valueAsBits(integral), valueAsBits(-100.0f));
}
TEST(ModffTest, InDoubleRange) {
using BitsType = Properties::BitsType;
constexpr BitsType count = 10000000;
constexpr BitsType step = UINT32_MAX / count;
for (BitsType i = 0, v = 0; i <= count; ++i, v += step) {
float x = valueFromBits(v);
if (isnan(x) || isinf(x) || x == 0.0f) {
// These conditions have been tested in other tests.
continue;
}
float integral;
float frac = __llvm_libc::modff(x, &integral);
ASSERT_TRUE(__llvm_libc::fputil::abs(frac) < 1.0f);
ASSERT_TRUE(__llvm_libc::fputil::trunc(x) == integral);
ASSERT_TRUE(integral + frac == x);
}
}