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//===-- Utility class to test different flavors of fma --------------------===//
//
// 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_FMATEST_H
#define LLVM_LIBC_TEST_SRC_MATH_FMATEST_H
#include "src/__support/FPUtil/FPBits.h"
#include "test/UnitTest/FPMatcher.h"
#include "test/UnitTest/Test.h"
template <typename T>
class FmaTestTemplate : public LIBC_NAMESPACE::testing::Test {
private:
using Func = T (*)(T, T, T);
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();
public:
void test_special_numbers(Func func) {
EXPECT_FP_EQ(func(zero, zero, zero), zero);
EXPECT_FP_EQ(func(zero, neg_zero, neg_zero), neg_zero);
EXPECT_FP_EQ(func(inf, inf, zero), inf);
EXPECT_FP_EQ(func(neg_inf, inf, neg_inf), neg_inf);
EXPECT_FP_EQ(func(inf, zero, zero), nan);
EXPECT_FP_EQ(func(inf, neg_inf, inf), nan);
EXPECT_FP_EQ(func(nan, zero, inf), nan);
EXPECT_FP_EQ(func(inf, neg_inf, nan), nan);
// Test underflow rounding up.
EXPECT_FP_EQ(func(T(0.5), FPBits::min_subnormal().get_val(),
FPBits::min_subnormal().get_val()),
FPBits(StorageType(2)).get_val());
// Test underflow rounding down.
StorageType MIN_NORMAL = FPBits::min_normal().uintval();
T v = FPBits(MIN_NORMAL + StorageType(1)).get_val();
EXPECT_FP_EQ(
func(T(1) / T(MIN_NORMAL << 1), v, FPBits::min_normal().get_val()), v);
// Test overflow.
T z = FPBits::max_normal().get_val();
EXPECT_FP_EQ(func(T(1.75), z, -z), T(0.75) * z);
// Exact cancellation.
EXPECT_FP_EQ(func(T(3.0), T(5.0), -T(15.0)), T(0.0));
EXPECT_FP_EQ(func(T(-3.0), T(5.0), T(15.0)), T(0.0));
}
};
#endif // LLVM_LIBC_TEST_SRC_MATH_FMATEST_H
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