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//===-- Unittests for tanhf -----------------------------------------------===//
//
// 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/math_macros.h"
#include "src/__support/FPUtil/FPBits.h"
#include "src/__support/libc_errno.h"
#include "src/math/tanhf.h"
#include "test/UnitTest/FPMatcher.h"
#include "test/UnitTest/Test.h"
#include "utils/MPFRWrapper/MPFRUtils.h"
#include "hdr/stdint_proxy.h"
using LlvmLibcTanhfTest = LIBC_NAMESPACE::testing::FPTest<float>;
namespace mpfr = LIBC_NAMESPACE::testing::mpfr;
TEST_F(LlvmLibcTanhfTest, SpecialNumbers) {
libc_errno = 0;
EXPECT_FP_EQ(aNaN, LIBC_NAMESPACE::tanhf(aNaN));
EXPECT_MATH_ERRNO(0);
EXPECT_FP_EQ(0.0f, LIBC_NAMESPACE::tanhf(0.0f));
EXPECT_MATH_ERRNO(0);
EXPECT_FP_EQ(-0.0f, LIBC_NAMESPACE::tanhf(-0.0f));
EXPECT_MATH_ERRNO(0);
EXPECT_FP_EQ(1.0f, LIBC_NAMESPACE::tanhf(inf));
EXPECT_MATH_ERRNO(0);
EXPECT_FP_EQ(-1.0f, LIBC_NAMESPACE::tanhf(neg_inf));
EXPECT_MATH_ERRNO(0);
}
TEST_F(LlvmLibcTanhfTest, InFloatRange) {
constexpr uint32_t COUNT = 100'001;
constexpr uint32_t STEP = UINT32_MAX / COUNT;
for (uint32_t i = 0, v = 0; i <= COUNT; ++i, v += STEP) {
float x = FPBits(v).get_val();
if (FPBits(v).is_nan() || FPBits(v).is_inf())
continue;
ASSERT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Tanh, x,
LIBC_NAMESPACE::tanhf(x), 0.5);
}
}
TEST_F(LlvmLibcTanhfTest, ExceptionalValues) {
constexpr int N = 4;
constexpr uint32_t INPUTS[N] = {
0x0040'0000,
0x1780'0000,
0x3a12'85ff,
0x4058'e0a3,
};
for (int i = 0; i < N; ++i) {
float x = FPBits(INPUTS[i]).get_val();
EXPECT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Tanh, x,
LIBC_NAMESPACE::tanhf(x), 0.5);
EXPECT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Tanh, -x,
LIBC_NAMESPACE::tanhf(-x), 0.5);
}
}
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