1//===-- Unittests for e^x - 1 ---------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9#include "hdr/math_macros.h"
10#include "src/__support/FPUtil/FPBits.h"
11#include "src/errno/libc_errno.h"
12#include "src/math/expm1.h"
13#include "test/UnitTest/FPMatcher.h"
14#include "test/UnitTest/Test.h"
15
16#include <errno.h>
17#include <stdint.h>
18
19using LlvmLibcExpm1Test = LIBC_NAMESPACE::testing::FPTest<double>;
20
21TEST_F(LlvmLibcExpm1Test, SpecialNumbers) {
22 EXPECT_FP_EQ(aNaN, LIBC_NAMESPACE::expm1(aNaN));
23 EXPECT_FP_EQ(inf, LIBC_NAMESPACE::expm1(inf));
24 EXPECT_FP_EQ_ALL_ROUNDING(-1.0, LIBC_NAMESPACE::expm1(neg_inf));
25 EXPECT_FP_EQ_WITH_EXCEPTION(inf, LIBC_NAMESPACE::expm1(0x1.0p20),
26 FE_OVERFLOW);
27 EXPECT_FP_EQ_ALL_ROUNDING(zero, LIBC_NAMESPACE::expm1(zero));
28 EXPECT_FP_EQ_ALL_ROUNDING(neg_zero, LIBC_NAMESPACE::expm1(neg_zero));
29 // |x| < 2^-53, expm1(x) = x
30 EXPECT_FP_EQ(-0x1.23456789abcdep-55,
31 LIBC_NAMESPACE::expm1(-0x1.23456789abcdep-55));
32 EXPECT_FP_EQ(0x1.23456789abcdep-55,
33 LIBC_NAMESPACE::expm1(0x1.23456789abcdep-55));
34 // log(2^-54)
35 EXPECT_FP_EQ(-1.0, LIBC_NAMESPACE::expm1(-0x1.2b708872320e2p5));
36}
37

source code of libc/test/src/math/smoke/expm1_test.cpp