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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 "hdr/math_macros.h"
#include "src/__support/FPUtil/BasicOperations.h"
#include "src/__support/FPUtil/FPBits.h"
#include "test/UnitTest/FEnvSafeTest.h"
#include "test/UnitTest/FPMatcher.h"
#include "test/UnitTest/Test.h"
#include "utils/MPFRWrapper/MPFRUtils.h"
namespace mpfr = LIBC_NAMESPACE::testing::mpfr;
using LIBC_NAMESPACE::Sign;
template <typename T>
class RemQuoTestTemplate : public LIBC_NAMESPACE::testing::FEnvSafeTest {
using FPBits = LIBC_NAMESPACE::fputil::FPBits<T>;
using StorageType = typename FPBits::StorageType;
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();
public:
typedef T (*RemQuoFunc)(T, T, int *);
void testSpecialNumbers(RemQuoFunc func) {
int quotient;
T x, y;
y = T(1.0);
x = inf;
EXPECT_FP_EQ(nan, func(x, y, "ient));
x = neg_inf;
EXPECT_FP_EQ(nan, func(x, y, "ient));
x = T(1.0);
y = zero;
EXPECT_FP_EQ(nan, func(x, y, "ient));
y = neg_zero;
EXPECT_FP_EQ(nan, func(x, y, "ient));
y = nan;
x = T(1.0);
EXPECT_FP_EQ(nan, func(x, y, "ient));
y = T(1.0);
x = nan;
EXPECT_FP_EQ(nan, func(x, y, "ient));
x = nan;
y = nan;
EXPECT_FP_EQ(nan, func(x, y, "ient));
x = zero;
y = T(1.0);
EXPECT_FP_EQ(func(x, y, "ient), zero);
x = neg_zero;
y = T(1.0);
EXPECT_FP_EQ(func(x, y, "ient), neg_zero);
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), neg_zero);
EXPECT_EQ(q, -1);
EXPECT_FP_EQ(func(-x, -y, &q), neg_zero);
EXPECT_EQ(q, 1);
}
void testSubnormalRange(RemQuoFunc func) {
constexpr StorageType COUNT = 100'001;
constexpr StorageType STEP = (MAX_SUBNORMAL - MIN_SUBNORMAL) / COUNT;
for (StorageType v = MIN_SUBNORMAL, w = MAX_SUBNORMAL;
v <= MAX_SUBNORMAL && w >= MIN_SUBNORMAL; v += STEP, w -= STEP) {
T x = FPBits(v).get_val(), y = FPBits(w).get_val();
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 StorageType COUNT = 1'001;
constexpr StorageType STEP = (MAX_NORMAL - MIN_NORMAL) / COUNT;
for (StorageType v = MIN_NORMAL, w = MAX_NORMAL;
v <= MAX_NORMAL && w >= MIN_NORMAL; v += STEP, w -= STEP) {
T x = FPBits(v).get_val(), y = FPBits(w).get_val();
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 (FPBits(v).is_nan() || FPBits(w).is_nan()) {
ASSERT_FP_EQ(result.f, nan);
continue;
}
ASSERT_MPFR_MATCH(mpfr::Operation::RemQuo, input, result, 0.0);
}
}
};
#define LIST_REMQUO_TESTS(T, func) \
using LlvmLibcRemQuoTest = RemQuoTestTemplate<T>; \
TEST_F(LlvmLibcRemQuoTest, SpecialNumbers) { testSpecialNumbers(&func); } \
TEST_F(LlvmLibcRemQuoTest, EqualNumeratorAndDenominator) { \
testEqualNumeratorAndDenominator(&func); \
} \
TEST_F(LlvmLibcRemQuoTest, SubnormalRange) { testSubnormalRange(&func); } \
TEST_F(LlvmLibcRemQuoTest, NormalRange) { testNormalRange(&func); }
#endif // LLVM_LIBC_TEST_SRC_MATH_REMQUOTEST_H
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