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//===-- Utility class to test different flavors of rint ---------*- C++ -*-===//
//
// 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
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIBC_TEST_SRC_MATH_RINTTEST_H
#define LLVM_LIBC_TEST_SRC_MATH_RINTTEST_H
#include "src/__support/FPUtil/FEnvImpl.h"
#include "src/__support/FPUtil/FPBits.h"
#include "test/UnitTest/FPMatcher.h"
#include "test/UnitTest/Test.h"
#include "utils/MPFRWrapper/MPFRUtils.h"
#include <fenv.h>
#include <math.h>
#include <stdio.h>
namespace mpfr = LIBC_NAMESPACE::testing::mpfr;
static constexpr int ROUNDING_MODES[4] = {FE_UPWARD, FE_DOWNWARD, FE_TOWARDZERO,
FE_TONEAREST};
template <typename T>
class RIntTestTemplate : public LIBC_NAMESPACE::testing::Test {
public:
typedef T (*RIntFunc)(T);
private:
using FPBits = LIBC_NAMESPACE::fputil::FPBits<T>;
using StorageType = typename FPBits::StorageType;
using Sign = LIBC_NAMESPACE::fputil::Sign;
const T inf = FPBits::inf(Sign::POS).get_val();
const T neg_inf = FPBits::inf(Sign::NEG).get_val();
const T zero = FPBits::zero(Sign::POS).get_val();
const T neg_zero = FPBits::zero(Sign::NEG).get_val();
const T nan = FPBits::quiet_nan().get_val();
static constexpr StorageType MIN_SUBNORMAL =
FPBits::min_subnormal().uintval();
static constexpr StorageType MAX_SUBNORMAL =
FPBits::max_subnormal().uintval();
static constexpr StorageType MIN_NORMAL = FPBits::min_normal().uintval();
static constexpr StorageType MAX_NORMAL = FPBits::max_normal().uintval();
static inline mpfr::RoundingMode to_mpfr_rounding_mode(int mode) {
switch (mode) {
case FE_UPWARD:
return mpfr::RoundingMode::Upward;
case FE_DOWNWARD:
return mpfr::RoundingMode::Downward;
case FE_TOWARDZERO:
return mpfr::RoundingMode::TowardZero;
case FE_TONEAREST:
return mpfr::RoundingMode::Nearest;
default:
__builtin_unreachable();
}
}
public:
void testSpecialNumbers(RIntFunc func) {
for (int mode : ROUNDING_MODES) {
LIBC_NAMESPACE::fputil::set_round(mode);
ASSERT_FP_EQ(inf, func(inf));
ASSERT_FP_EQ(neg_inf, func(neg_inf));
ASSERT_FP_EQ(nan, func(nan));
ASSERT_FP_EQ(zero, func(zero));
ASSERT_FP_EQ(neg_zero, func(neg_zero));
}
}
void testRoundNumbers(RIntFunc func) {
for (int mode : ROUNDING_MODES) {
LIBC_NAMESPACE::fputil::set_round(mode);
mpfr::RoundingMode mpfr_mode = to_mpfr_rounding_mode(mode);
ASSERT_FP_EQ(func(T(1.0)), mpfr::round(T(1.0), mpfr_mode));
ASSERT_FP_EQ(func(T(-1.0)), mpfr::round(T(-1.0), mpfr_mode));
ASSERT_FP_EQ(func(T(10.0)), mpfr::round(T(10.0), mpfr_mode));
ASSERT_FP_EQ(func(T(-10.0)), mpfr::round(T(-10.0), mpfr_mode));
ASSERT_FP_EQ(func(T(1234.0)), mpfr::round(T(1234.0), mpfr_mode));
ASSERT_FP_EQ(func(T(-1234.0)), mpfr::round(T(-1234.0), mpfr_mode));
}
}
void testFractions(RIntFunc func) {
for (int mode : ROUNDING_MODES) {
LIBC_NAMESPACE::fputil::set_round(mode);
mpfr::RoundingMode mpfr_mode = to_mpfr_rounding_mode(mode);
ASSERT_FP_EQ(func(T(0.5)), mpfr::round(T(0.5), mpfr_mode));
ASSERT_FP_EQ(func(T(-0.5)), mpfr::round(T(-0.5), mpfr_mode));
ASSERT_FP_EQ(func(T(0.115)), mpfr::round(T(0.115), mpfr_mode));
ASSERT_FP_EQ(func(T(-0.115)), mpfr::round(T(-0.115), mpfr_mode));
ASSERT_FP_EQ(func(T(0.715)), mpfr::round(T(0.715), mpfr_mode));
ASSERT_FP_EQ(func(T(-0.715)), mpfr::round(T(-0.715), mpfr_mode));
}
}
void testSubnormalRange(RIntFunc func) {
constexpr StorageType COUNT = 100'001;
constexpr StorageType STEP = (MAX_SUBNORMAL - MIN_SUBNORMAL) / COUNT;
for (StorageType i = MIN_SUBNORMAL; i <= MAX_SUBNORMAL; i += STEP) {
T x = FPBits(i).get_val();
for (int mode : ROUNDING_MODES) {
LIBC_NAMESPACE::fputil::set_round(mode);
mpfr::RoundingMode mpfr_mode = to_mpfr_rounding_mode(mode);
ASSERT_FP_EQ(func(x), mpfr::round(x, mpfr_mode));
}
}
}
void testNormalRange(RIntFunc func) {
constexpr StorageType COUNT = 100'001;
constexpr StorageType STEP = (MAX_NORMAL - MIN_NORMAL) / COUNT;
for (StorageType i = MIN_NORMAL; i <= MAX_NORMAL; i += STEP) {
T x = FPBits(i).get_val();
// In normal range on x86 platforms, the long double implicit 1 bit can be
// zero making the numbers NaN. We will skip them.
if (isnan(x)) {
continue;
}
for (int mode : ROUNDING_MODES) {
LIBC_NAMESPACE::fputil::set_round(mode);
mpfr::RoundingMode mpfr_mode = to_mpfr_rounding_mode(mode);
ASSERT_FP_EQ(func(x), mpfr::round(x, mpfr_mode));
}
}
}
};
#define LIST_RINT_TESTS(F, func) \
using LlvmLibcRIntTest = RIntTestTemplate<F>; \
TEST_F(LlvmLibcRIntTest, specialNumbers) { testSpecialNumbers(&func); } \
TEST_F(LlvmLibcRIntTest, RoundNumbers) { testRoundNumbers(&func); } \
TEST_F(LlvmLibcRIntTest, Fractions) { testFractions(&func); } \
TEST_F(LlvmLibcRIntTest, SubnormalRange) { testSubnormalRange(&func); } \
TEST_F(LlvmLibcRIntTest, NormalRange) { testNormalRange(&func); }
#endif // LLVM_LIBC_TEST_SRC_MATH_RINTTEST_H
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