| 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/__support/libc_errno.h" |
|---|
| 12 | #include "src/math/expm1.h" |
|---|
| 13 | #include "test/UnitTest/FPMatcher.h" |
|---|
| 14 | #include "test/UnitTest/Test.h" |
|---|
| 15 | |
|---|
| 16 | #include <stdint.h> |
|---|
| 17 | |
|---|
| 18 | using LlvmLibcExpm1Test = LIBC_NAMESPACE::testing::FPTest<double>; |
|---|
| 19 | |
|---|
| 20 | TEST_F(LlvmLibcExpm1Test, SpecialNumbers) { |
|---|
| 21 | EXPECT_FP_EQ_WITH_EXCEPTION(aNaN, LIBC_NAMESPACE::expm1(sNaN), FE_INVALID); |
|---|
| 22 | EXPECT_MATH_ERRNO(0); |
|---|
| 23 | |
|---|
| 24 | EXPECT_FP_EQ(aNaN, LIBC_NAMESPACE::expm1(aNaN)); |
|---|
| 25 | EXPECT_FP_EQ(inf, LIBC_NAMESPACE::expm1(inf)); |
|---|
| 26 | EXPECT_FP_EQ_ALL_ROUNDING(-1.0, LIBC_NAMESPACE::expm1(neg_inf)); |
|---|
| 27 | EXPECT_FP_EQ_WITH_EXCEPTION(inf, LIBC_NAMESPACE::expm1(0x1.0p20), |
|---|
| 28 | FE_OVERFLOW); |
|---|
| 29 | EXPECT_FP_EQ_ALL_ROUNDING(zero, LIBC_NAMESPACE::expm1(zero)); |
|---|
| 30 | EXPECT_FP_EQ_ALL_ROUNDING(neg_zero, LIBC_NAMESPACE::expm1(neg_zero)); |
|---|
| 31 | // |x| < 2^-53, expm1(x) = x |
|---|
| 32 | EXPECT_FP_EQ(-0x1.23456789abcdep-55, |
|---|
| 33 | LIBC_NAMESPACE::expm1(-0x1.23456789abcdep-55)); |
|---|
| 34 | EXPECT_FP_EQ(0x1.23456789abcdep-55, |
|---|
| 35 | LIBC_NAMESPACE::expm1(0x1.23456789abcdep-55)); |
|---|
| 36 | // log(2^-54) |
|---|
| 37 | EXPECT_FP_EQ(-1.0, LIBC_NAMESPACE::expm1(-0x1.2b708872320e2p5)); |
|---|
| 38 | } |
|---|
| 39 | |
|---|
| 40 | #ifdef LIBC_TEST_FTZ_DAZ |
|---|
| 41 | |
|---|
| 42 | using namespace LIBC_NAMESPACE::testing; |
|---|
| 43 | |
|---|
| 44 | TEST_F(LlvmLibcExpm1Test, FTZMode) { |
|---|
| 45 | ModifyMXCSR mxcsr(FTZ); |
|---|
| 46 | |
|---|
| 47 | EXPECT_FP_EQ(0.0, LIBC_NAMESPACE::expm1(min_denormal)); |
|---|
| 48 | EXPECT_FP_EQ(0.0, LIBC_NAMESPACE::expm1(max_denormal)); |
|---|
| 49 | } |
|---|
| 50 | |
|---|
| 51 | TEST_F(LlvmLibcExpm1Test, DAZMode) { |
|---|
| 52 | ModifyMXCSR mxcsr(DAZ); |
|---|
| 53 | |
|---|
| 54 | EXPECT_FP_EQ(0.0, LIBC_NAMESPACE::expm1(min_denormal)); |
|---|
| 55 | EXPECT_FP_EQ(0.0, LIBC_NAMESPACE::expm1(max_denormal)); |
|---|
| 56 | } |
|---|
| 57 | |
|---|
| 58 | TEST_F(LlvmLibcExpm1Test, FTZDAZMode) { |
|---|
| 59 | ModifyMXCSR mxcsr(FTZ | DAZ); |
|---|
| 60 | |
|---|
| 61 | EXPECT_FP_EQ(0.0, LIBC_NAMESPACE::expm1(min_denormal)); |
|---|
| 62 | EXPECT_FP_EQ(0.0, LIBC_NAMESPACE::expm1(max_denormal)); |
|---|
| 63 | } |
|---|
| 64 | |
|---|
| 65 | #endif |
|---|
| 66 | |
|---|
