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//===-- Utility class to test different flavors of remquo -------*- 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_REMQUOTEST_H
#define LLVM_LIBC_TEST_SRC_MATH_REMQUOTEST_H
#include "utils/FPUtil/BasicOperations.h"
#include "utils/FPUtil/FPBits.h"
#include "utils/FPUtil/TestHelpers.h"
#include "utils/MPFRWrapper/MPFRUtils.h"
#include "utils/UnitTest/Test.h"
#include <math.h>
namespace mpfr = __llvm_libc::testing::mpfr;
template <typename T>
class RemQuoTestTemplate : public __llvm_libc::testing::Test {
using FPBits = __llvm_libc::fputil::FPBits<T>;
using UIntType = typename FPBits::UIntType;
const T zero = __llvm_libc::fputil::FPBits<T>::zero();
const T negZero = __llvm_libc::fputil::FPBits<T>::negZero();
const T inf = __llvm_libc::fputil::FPBits<T>::inf();
const T negInf = __llvm_libc::fputil::FPBits<T>::negInf();
const T nan = __llvm_libc::fputil::FPBits<T>::buildNaN(1);
public:
typedef T (*RemQuoFunc)(T, T, int *);
void testSpecialNumbers(RemQuoFunc func) {
int quotient;
T x, y;
y = T(1.0);
x = inf;
EXPECT_NE(isnan(func(x, y, "ient)), 0);
x = negInf;
EXPECT_NE(isnan(func(x, y, "ient)), 0);
x = T(1.0);
y = zero;
EXPECT_NE(isnan(func(x, y, "ient)), 0);
y = negZero;
EXPECT_NE(isnan(func(x, y, "ient)), 0);
y = nan;
x = T(1.0);
EXPECT_NE(isnan(func(x, y, "ient)), 0);
y = T(1.0);
x = nan;
EXPECT_NE(isnan(func(x, y, "ient)), 0);
x = nan;
y = nan;
EXPECT_NE(isnan(func(x, y, "ient)), 0);
x = zero;
y = T(1.0);
EXPECT_FP_EQ(func(x, y, "ient), zero);
x = negZero;
y = T(1.0);
EXPECT_FP_EQ(func(x, y, "ient), negZero);
x = T(1.125);
y = inf;
EXPECT_FP_EQ(func(x, y, "ient), x);
EXPECT_EQ(quotient, 0);
}
void testEqualNumeratorAndDenominator(RemQuoFunc func) {
T x = T(1.125), y = T(1.125);
int q;
// When the remainder is zero, the standard requires it to
// have the same sign as x.
EXPECT_FP_EQ(func(x, y, &q), zero);
EXPECT_EQ(q, 1);
EXPECT_FP_EQ(func(x, -y, &q), zero);
EXPECT_EQ(q, -1);
EXPECT_FP_EQ(func(-x, y, &q), negZero);
EXPECT_EQ(q, -1);
EXPECT_FP_EQ(func(-x, -y, &q), negZero);
EXPECT_EQ(q, 1);
}
void testSubnormalRange(RemQuoFunc func) {
constexpr UIntType count = 1000001;
constexpr UIntType step =
(FPBits::maxSubnormal - FPBits::minSubnormal) / count;
for (UIntType v = FPBits::minSubnormal, w = FPBits::maxSubnormal;
v <= FPBits::maxSubnormal && w >= FPBits::minSubnormal;
v += step, w -= step) {
T x = FPBits(v), y = FPBits(w);
mpfr::BinaryOutput<T> result;
mpfr::BinaryInput<T> input{x, y};
result.f = func(x, y, &result.i);
ASSERT_MPFR_MATCH(mpfr::Operation::RemQuo, input, result, 0.0);
}
}
void testNormalRange(RemQuoFunc func) {
constexpr UIntType count = 1000001;
constexpr UIntType step = (FPBits::maxNormal - FPBits::minNormal) / count;
for (UIntType v = FPBits::minNormal, w = FPBits::maxNormal;
v <= FPBits::maxNormal && w >= FPBits::minNormal;
v += step, w -= step) {
T x = FPBits(v), y = FPBits(w);
mpfr::BinaryOutput<T> result;
mpfr::BinaryInput<T> input{x, y};
result.f = func(x, y, &result.i);
// In normal range on x86 platforms, the long double implicit 1 bit can be
// zero making the numbers NaN. Hence we test for them separately.
if (isnan(x) || isnan(y)) {
ASSERT_NE(isnan(result.f), 0);
continue;
}
ASSERT_MPFR_MATCH(mpfr::Operation::RemQuo, input, result, 0.0);
}
}
};
#define LIST_REMQUO_TESTS(T, func) \
using RemQuoTest = RemQuoTestTemplate<T>; \
TEST_F(RemQuoTest, SpecialNumbers) { testSpecialNumbers(&func); } \
TEST_F(RemQuoTest, EqualNumeratorAndDenominator) { \
testEqualNumeratorAndDenominator(&func); \
} \
TEST_F(RemQuoTest, SubnormalRange) { testSubnormalRange(&func); } \
TEST_F(RemQuoTest, NormalRange) { testNormalRange(&func); }
#endif // LLVM_LIBC_TEST_SRC_MATH_REMQUOTEST_H
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