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//===-- Unittests for atanhf ----------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
#include "include/llvm-libc-macros/math-macros.h"
#include "src/__support/FPUtil/FPBits.h"
#include "src/errno/libc_errno.h"
#include "src/math/atanhf.h"
#include "test/UnitTest/FPMatcher.h"
#include "test/UnitTest/Test.h"
#include "utils/MPFRWrapper/MPFRUtils.h"
#include <errno.h>
#include <stdint.h>
using LlvmLibcAtanhfTest = LIBC_NAMESPACE::testing::FPTest<float>;
namespace mpfr = LIBC_NAMESPACE::testing::mpfr;
TEST_F(LlvmLibcAtanhfTest, SpecialNumbers) {
LIBC_NAMESPACE::libc_errno = 0;
LIBC_NAMESPACE::fputil::clear_except(FE_ALL_EXCEPT);
EXPECT_FP_EQ_ALL_ROUNDING(aNaN, LIBC_NAMESPACE::atanhf(aNaN));
EXPECT_FP_EXCEPTION(0);
EXPECT_MATH_ERRNO(0);
LIBC_NAMESPACE::fputil::clear_except(FE_ALL_EXCEPT);
EXPECT_FP_EQ_ALL_ROUNDING(0.0f, LIBC_NAMESPACE::atanhf(0.0f));
EXPECT_FP_EXCEPTION(0);
EXPECT_MATH_ERRNO(0);
LIBC_NAMESPACE::fputil::clear_except(FE_ALL_EXCEPT);
EXPECT_FP_EQ_ALL_ROUNDING(-0.0f, LIBC_NAMESPACE::atanhf(-0.0f));
EXPECT_FP_EXCEPTION(0);
EXPECT_MATH_ERRNO(0);
LIBC_NAMESPACE::fputil::clear_except(FE_ALL_EXCEPT);
EXPECT_FP_EQ_ALL_ROUNDING(inf, LIBC_NAMESPACE::atanhf(1.0f));
EXPECT_FP_EXCEPTION(FE_DIVBYZERO);
EXPECT_MATH_ERRNO(ERANGE);
LIBC_NAMESPACE::fputil::clear_except(FE_ALL_EXCEPT);
EXPECT_FP_EQ_ALL_ROUNDING(neg_inf, LIBC_NAMESPACE::atanhf(-1.0f));
EXPECT_FP_EXCEPTION(FE_DIVBYZERO);
EXPECT_MATH_ERRNO(ERANGE);
auto bt = FPBits(1.0f);
bt.set_uintval(bt.uintval() + 1);
LIBC_NAMESPACE::fputil::clear_except(FE_ALL_EXCEPT);
EXPECT_FP_EQ_ALL_ROUNDING(aNaN, LIBC_NAMESPACE::atanhf(bt.get_val()));
EXPECT_FP_EXCEPTION(FE_INVALID);
EXPECT_MATH_ERRNO(EDOM);
LIBC_NAMESPACE::fputil::clear_except(FE_ALL_EXCEPT);
bt.set_sign(Sign::NEG);
EXPECT_FP_EQ_ALL_ROUNDING(aNaN, LIBC_NAMESPACE::atanhf(bt.get_val()));
EXPECT_FP_EXCEPTION(FE_INVALID);
EXPECT_MATH_ERRNO(EDOM);
LIBC_NAMESPACE::fputil::clear_except(FE_ALL_EXCEPT);
EXPECT_FP_EQ_ALL_ROUNDING(aNaN, LIBC_NAMESPACE::atanhf(2.0f));
EXPECT_FP_EXCEPTION(FE_INVALID);
EXPECT_MATH_ERRNO(EDOM);
LIBC_NAMESPACE::fputil::clear_except(FE_ALL_EXCEPT);
EXPECT_FP_EQ_ALL_ROUNDING(aNaN, LIBC_NAMESPACE::atanhf(-2.0f));
EXPECT_FP_EXCEPTION(FE_INVALID);
EXPECT_MATH_ERRNO(EDOM);
LIBC_NAMESPACE::fputil::clear_except(FE_ALL_EXCEPT);
EXPECT_FP_EQ_ALL_ROUNDING(aNaN, LIBC_NAMESPACE::atanhf(inf));
EXPECT_FP_EXCEPTION(FE_INVALID);
EXPECT_MATH_ERRNO(EDOM);
bt.set_sign(Sign::NEG);
EXPECT_FP_EQ_ALL_ROUNDING(aNaN, LIBC_NAMESPACE::atanhf(neg_inf));
EXPECT_FP_EXCEPTION(FE_INVALID);
EXPECT_MATH_ERRNO(EDOM);
}
TEST_F(LlvmLibcAtanhfTest, InFloatRange) {
constexpr uint32_t COUNT = 100'000;
const uint32_t STEP = FPBits(1.0f).uintval() / COUNT;
for (uint32_t i = 0, v = 0; i <= COUNT; ++i, v += STEP) {
float x = FPBits(v).get_val();
ASSERT_MPFR_MATCH(mpfr::Operation::Atanh, x, LIBC_NAMESPACE::atanhf(x),
0.5);
ASSERT_MPFR_MATCH(mpfr::Operation::Atanh, -x, LIBC_NAMESPACE::atanhf(-x),
0.5);
}
}
// For small values, atanh(x) is x.
TEST_F(LlvmLibcAtanhfTest, SmallValues) {
float x = FPBits(uint32_t(0x17800000)).get_val();
float result = LIBC_NAMESPACE::atanhf(x);
EXPECT_MPFR_MATCH(mpfr::Operation::Atanh, x, result, 0.5);
EXPECT_FP_EQ(x, result);
x = FPBits(uint32_t(0x00400000)).get_val();
result = LIBC_NAMESPACE::atanhf(x);
EXPECT_MPFR_MATCH(mpfr::Operation::Atanh, x, result, 0.5);
EXPECT_FP_EQ(x, result);
}
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