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Differential D132811 Diff 456755 libc/test/src/math/atanhf_test.cpp

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libc/test/src/math/atanhf_test.cpp

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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 "src/__support/FPUtil/FPBits.h"
				#include "src/math/atanhf.h"
				#include "utils/MPFRWrapper/MPFRUtils.h"
				#include "utils/UnitTest/FPMatcher.h"
				#include "utils/UnitTest/Test.h"
				#include <math.h>

				#include <errno.h>
				#include <stdint.h>

				using FPBits = __llvm_libc::fputil::FPBits<float>;

				namespace mpfr = __llvm_libc::testing::mpfr;

				DECLARE_SPECIAL_CONSTANTS(float)

				TEST(LlvmLibcAtanhfTest, SpecialNumbers) {
				errno = 0;
				__llvm_libc::fputil::clear_except(FE_ALL_EXCEPT);
				EXPECT_FP_EQ(aNaN, __llvm_libc::atanhf(aNaN));
				EXPECT_FP_EXCEPTION(FE_INVALID);
				EXPECT_MATH_ERRNO(0);

				__llvm_libc::fputil::clear_except(FE_ALL_EXCEPT);
				EXPECT_FP_EQ(0.0f, __llvm_libc::atanhf(0.0f));
				EXPECT_FP_EXCEPTION(0);
				EXPECT_MATH_ERRNO(0);

				__llvm_libc::fputil::clear_except(FE_ALL_EXCEPT);
				EXPECT_FP_EQ(-0.0f, __llvm_libc::atanhf(-0.0f));
				EXPECT_FP_EXCEPTION(0);
				EXPECT_MATH_ERRNO(0);

				__llvm_libc::fputil::clear_except(FE_ALL_EXCEPT);
				EXPECT_FP_EQ(inf, __llvm_libc::atanhf(1.0f));
				EXPECT_FP_EXCEPTION(FE_DIVBYZERO);
				EXPECT_MATH_ERRNO(ERANGE);

				__llvm_libc::fputil::clear_except(FE_ALL_EXCEPT);
				EXPECT_FP_EQ(neg_inf, __llvm_libc::atanhf(-1.0f));
				EXPECT_FP_EXCEPTION(FE_DIVBYZERO);
				EXPECT_MATH_ERRNO(ERANGE);

				auto bt = FPBits(1.0f);
				bt.bits += 1;

				__llvm_libc::fputil::clear_except(FE_ALL_EXCEPT);
				EXPECT_FP_EQ(aNaN, __llvm_libc::atanhf(bt.get_val()));
				EXPECT_FP_EXCEPTION(FE_INVALID);
				EXPECT_MATH_ERRNO(EDOM);

				__llvm_libc::fputil::clear_except(FE_ALL_EXCEPT);
				bt.set_sign(true);
				EXPECT_FP_EQ(aNaN, __llvm_libc::atanhf(bt.get_val()));
				EXPECT_FP_EXCEPTION(FE_INVALID);
				EXPECT_MATH_ERRNO(EDOM);

				__llvm_libc::fputil::clear_except(FE_ALL_EXCEPT);
				EXPECT_FP_EQ(aNaN, __llvm_libc::atanhf(2.0f));
				EXPECT_FP_EXCEPTION(FE_INVALID);
				EXPECT_MATH_ERRNO(EDOM);

				__llvm_libc::fputil::clear_except(FE_ALL_EXCEPT);
				EXPECT_FP_EQ(aNaN, __llvm_libc::atanhf(-2.0f));
				EXPECT_FP_EXCEPTION(FE_INVALID);
				EXPECT_MATH_ERRNO(EDOM);

				__llvm_libc::fputil::clear_except(FE_ALL_EXCEPT);
				EXPECT_FP_EQ(aNaN, __llvm_libc::atanhf(inf));
				EXPECT_FP_EXCEPTION(FE_INVALID);
				EXPECT_MATH_ERRNO(EDOM);

				bt.set_sign(true);
				EXPECT_FP_EQ(aNaN, __llvm_libc::atanhf(neg_inf));
				EXPECT_FP_EXCEPTION(FE_INVALID);
				EXPECT_MATH_ERRNO(EDOM);
				}

				TEST(LlvmLibcAtanhfTest, InFloatRange) {
				constexpr uint32_t COUNT = 1000000;
				const uint32_t STEP = FPBits(1.0f).uintval() / COUNT;
				for (uint32_t i = 0, v = 0; i <= COUNT; ++i, v += STEP) {
				float x = float(FPBits(v));
				ASSERT_MPFR_MATCH(mpfr::Operation::Atanh, x, __llvm_libc::atanhf(x), 0.5);
				ASSERT_MPFR_MATCH(mpfr::Operation::Atanh, -x, __llvm_libc::atanhf(-x), 0.5);
				}
				}

				// For small values, atanh(x) is x.
				TEST(LlvmLibcAtanhfTest, SmallValues) {
				float x = float(FPBits(uint32_t(0x17800000)));
				float result = __llvm_libc::atanhf(x);
				EXPECT_MPFR_MATCH(mpfr::Operation::Atanh, x, result, 0.5);
				EXPECT_FP_EQ(x, result);

				x = float(FPBits(uint32_t(0x00400000)));
				result = __llvm_libc::atanhf(x);
				EXPECT_MPFR_MATCH(mpfr::Operation::Atanh, x, result, 0.5);
				EXPECT_FP_EQ(x, result);
				}