143 changes: 143 additions & 0 deletions libc/test/src/math/smoke/tanhf16_test.cpp
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//===-- Unittests for tanhf16 ---------------------------------------------===//
//
// 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 "hdr/fenv_macros.h"
#include "src/__support/FPUtil/cast.h"
#include "src/errno/libc_errno.h"
#include "src/math/tanhf16.h"
#include "test/UnitTest/FPMatcher.h"
#include "test/UnitTest/Test.h"

using LlvmLibcTanhf16Test = LIBC_NAMESPACE::testing::FPTest<float16>;

TEST_F(LlvmLibcTanhf16Test, SpecialNumbers) {
LIBC_NAMESPACE::libc_errno = 0;

EXPECT_FP_EQ_ALL_ROUNDING(aNaN, LIBC_NAMESPACE::tanhf16(aNaN));
EXPECT_MATH_ERRNO(0);

EXPECT_FP_EQ_WITH_EXCEPTION(aNaN, LIBC_NAMESPACE::tanhf16(sNaN), FE_INVALID);
EXPECT_MATH_ERRNO(0);

EXPECT_FP_EQ_ALL_ROUNDING(LIBC_NAMESPACE::fputil::cast<float16>(1.0),
LIBC_NAMESPACE::tanhf16(inf));
EXPECT_MATH_ERRNO(0);

EXPECT_FP_EQ_ALL_ROUNDING(LIBC_NAMESPACE::fputil::cast<float16>(-1.0),
LIBC_NAMESPACE::tanhf16(neg_inf));
EXPECT_MATH_ERRNO(0);

EXPECT_FP_EQ_ALL_ROUNDING(zero, LIBC_NAMESPACE::tanhf16(zero));
EXPECT_MATH_ERRNO(0);

EXPECT_FP_EQ_ALL_ROUNDING(neg_zero, LIBC_NAMESPACE::tanhf16(neg_zero));
EXPECT_MATH_ERRNO(0);
}

TEST_F(LlvmLibcTanhf16Test, ResultNearBounds) {
LIBC_NAMESPACE::libc_errno = 0;

EXPECT_FP_EQ_WITH_EXCEPTION(LIBC_NAMESPACE::fputil::cast<float16>(1.0),
LIBC_NAMESPACE::tanhf16(max_normal), FE_INEXACT);
EXPECT_MATH_ERRNO(0);

EXPECT_FP_EQ_WITH_EXCEPTION(LIBC_NAMESPACE::fputil::cast<float16>(-1.0),
LIBC_NAMESPACE::tanhf16(neg_max_normal),
FE_INEXACT);
EXPECT_MATH_ERRNO(0);

// round(atanh(1 - 2^-11), HP, RU);
float16 x = LIBC_NAMESPACE::fputil::cast<float16>(0x1.0a4p+2);

EXPECT_FP_EQ_WITH_EXCEPTION_ROUNDING_NEAREST(
LIBC_NAMESPACE::fputil::cast<float16>(0x1.ffcp-1),
LIBC_NAMESPACE::tanhf16(x), FE_INEXACT);
EXPECT_MATH_ERRNO(0);

EXPECT_FP_EQ_WITH_EXCEPTION_ROUNDING_UPWARD(
LIBC_NAMESPACE::fputil::cast<float16>(1.0), LIBC_NAMESPACE::tanhf16(x),
FE_INEXACT);
EXPECT_MATH_ERRNO(0);

EXPECT_FP_EQ_WITH_EXCEPTION_ROUNDING_DOWNWARD(
LIBC_NAMESPACE::fputil::cast<float16>(0x1.ffcp-1),
LIBC_NAMESPACE::tanhf16(x), FE_INEXACT);
EXPECT_MATH_ERRNO(0);

EXPECT_FP_EQ_WITH_EXCEPTION_ROUNDING_TOWARD_ZERO(
LIBC_NAMESPACE::fputil::cast<float16>(0x1.ffcp-1),
LIBC_NAMESPACE::tanhf16(x), FE_INEXACT);
EXPECT_MATH_ERRNO(0);

x = LIBC_NAMESPACE::fputil::cast<float16>(0x1.208p+2);

EXPECT_FP_EQ_WITH_EXCEPTION_ROUNDING_NEAREST(
LIBC_NAMESPACE::fputil::cast<float16>(1.0), LIBC_NAMESPACE::tanhf16(x),
FE_INEXACT);
EXPECT_MATH_ERRNO(0);

EXPECT_FP_EQ_WITH_EXCEPTION_ROUNDING_UPWARD(
LIBC_NAMESPACE::fputil::cast<float16>(1.0), LIBC_NAMESPACE::tanhf16(x),
FE_INEXACT);
EXPECT_MATH_ERRNO(0);

EXPECT_FP_EQ_WITH_EXCEPTION_ROUNDING_DOWNWARD(
LIBC_NAMESPACE::fputil::cast<float16>(0x1.ffcp-1),
LIBC_NAMESPACE::tanhf16(x), FE_INEXACT);
EXPECT_MATH_ERRNO(0);

EXPECT_FP_EQ_WITH_EXCEPTION_ROUNDING_TOWARD_ZERO(
LIBC_NAMESPACE::fputil::cast<float16>(0x1.ffcp-1),
LIBC_NAMESPACE::tanhf16(x), FE_INEXACT);
EXPECT_MATH_ERRNO(0);

// round(atanh(-1 + 2^-11), HP, RD);
x = LIBC_NAMESPACE::fputil::cast<float16>(-0x1.0a4p+2);

EXPECT_FP_EQ_WITH_EXCEPTION_ROUNDING_NEAREST(
LIBC_NAMESPACE::fputil::cast<float16>(-0x1.ffcp-1),
LIBC_NAMESPACE::tanhf16(x), FE_INEXACT);
EXPECT_MATH_ERRNO(0);

EXPECT_FP_EQ_WITH_EXCEPTION_ROUNDING_UPWARD(
LIBC_NAMESPACE::fputil::cast<float16>(-0x1.ffcp-1),
LIBC_NAMESPACE::tanhf16(x), FE_INEXACT);
EXPECT_MATH_ERRNO(0);

EXPECT_FP_EQ_WITH_EXCEPTION_ROUNDING_DOWNWARD(
LIBC_NAMESPACE::fputil::cast<float16>(-1.0), LIBC_NAMESPACE::tanhf16(x),
FE_INEXACT);
EXPECT_MATH_ERRNO(0);

EXPECT_FP_EQ_WITH_EXCEPTION_ROUNDING_TOWARD_ZERO(
LIBC_NAMESPACE::fputil::cast<float16>(-0x1.ffcp-1),
LIBC_NAMESPACE::tanhf16(x), FE_INEXACT);
EXPECT_MATH_ERRNO(0);

x = LIBC_NAMESPACE::fputil::cast<float16>(-0x1.208p+2);

EXPECT_FP_EQ_WITH_EXCEPTION_ROUNDING_NEAREST(
LIBC_NAMESPACE::fputil::cast<float16>(-1.0), LIBC_NAMESPACE::tanhf16(x),
FE_INEXACT);
EXPECT_MATH_ERRNO(0);

EXPECT_FP_EQ_WITH_EXCEPTION_ROUNDING_UPWARD(
LIBC_NAMESPACE::fputil::cast<float16>(-0x1.ffcp-1),
LIBC_NAMESPACE::tanhf16(x), FE_INEXACT);
EXPECT_MATH_ERRNO(0);

EXPECT_FP_EQ_WITH_EXCEPTION_ROUNDING_DOWNWARD(
LIBC_NAMESPACE::fputil::cast<float16>(-1.0), LIBC_NAMESPACE::tanhf16(x),
FE_INEXACT);
EXPECT_MATH_ERRNO(0);

EXPECT_FP_EQ_WITH_EXCEPTION_ROUNDING_TOWARD_ZERO(
LIBC_NAMESPACE::fputil::cast<float16>(-0x1.ffcp-1),
LIBC_NAMESPACE::tanhf16(x), FE_INEXACT);
EXPECT_MATH_ERRNO(0);
}
40 changes: 40 additions & 0 deletions libc/test/src/math/tanhf16_test.cpp
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//===-- Exhaustive test for tanhf16 ---------------------------------------===//
//
// 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/math/tanhf16.h"
#include "test/UnitTest/FPMatcher.h"
#include "test/UnitTest/Test.h"
#include "utils/MPFRWrapper/MPFRUtils.h"

using LlvmLibcTanhf16Test = LIBC_NAMESPACE::testing::FPTest<float16>;

namespace mpfr = LIBC_NAMESPACE::testing::mpfr;

// Range: [0, Inf];
static constexpr uint16_t POS_START = 0x0000U;
static constexpr uint16_t POS_STOP = 0x7c00U;

// Range: [-Inf, 0];
static constexpr uint16_t NEG_START = 0x8000U;
static constexpr uint16_t NEG_STOP = 0xfc00U;

TEST_F(LlvmLibcTanhf16Test, PositiveRange) {
for (uint16_t v = POS_START; v <= POS_STOP; ++v) {
float16 x = FPBits(v).get_val();
EXPECT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Tanh, x,
LIBC_NAMESPACE::tanhf16(x), 0.5);
}
}

TEST_F(LlvmLibcTanhf16Test, NegativeRange) {
for (uint16_t v = NEG_START; v <= NEG_STOP; ++v) {
float16 x = FPBits(v).get_val();
EXPECT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Tanh, x,
LIBC_NAMESPACE::tanhf16(x), 0.5);
}
}