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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 UIntType = typename FPBits::UIntType;
const T zero = T(FPBits::zero());
const T neg_zero = T(FPBits::neg_zero());
const T inf = T(FPBits::inf());
const T neg_inf = T(FPBits::neg_inf());
const T nan = T(FPBits::build_quiet_nan(1));
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 UIntType COUNT = 100'001;
constexpr UIntType STEP =
(UIntType(FPBits::MAX_SUBNORMAL) - UIntType(FPBits::MIN_SUBNORMAL)) /
COUNT;
for (UIntType i = FPBits::MIN_SUBNORMAL; i <= FPBits::MAX_SUBNORMAL;
i += STEP) {
T x = T(FPBits(i));
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 UIntType COUNT = 100'001;
constexpr UIntType STEP =
(UIntType(FPBits::MAX_NORMAL) - UIntType(FPBits::MIN_NORMAL)) / COUNT;
for (UIntType i = FPBits::MIN_NORMAL; i <= FPBits::MAX_NORMAL; i += STEP) {
T x = T(FPBits(i));
// 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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