1//===-- Unittests for log -------------------------------------------------===//
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/log.h"
13#include "test/UnitTest/FPMatcher.h"
14#include "test/UnitTest/Test.h"
15
16#include <stdint.h>
17
18using LlvmLibcLogTest = LIBC_NAMESPACE::testing::FPTest<double>;
19
20TEST_F(LlvmLibcLogTest, SpecialNumbers) {
21 EXPECT_FP_EQ_WITH_EXCEPTION(aNaN, LIBC_NAMESPACE::log(sNaN), FE_INVALID);
22 EXPECT_MATH_ERRNO(0);
23
24 EXPECT_FP_EQ(aNaN, LIBC_NAMESPACE::log(aNaN));
25 EXPECT_FP_EQ(inf, LIBC_NAMESPACE::log(inf));
26 EXPECT_FP_IS_NAN_WITH_EXCEPTION(LIBC_NAMESPACE::log(neg_inf), FE_INVALID);
27 EXPECT_FP_EQ_WITH_EXCEPTION(neg_inf, LIBC_NAMESPACE::log(0.0), FE_DIVBYZERO);
28 EXPECT_FP_EQ_WITH_EXCEPTION(neg_inf, LIBC_NAMESPACE::log(-0.0), FE_DIVBYZERO);
29 EXPECT_FP_IS_NAN_WITH_EXCEPTION(LIBC_NAMESPACE::log(-1.0), FE_INVALID);
30 EXPECT_FP_EQ_ALL_ROUNDING(zero, LIBC_NAMESPACE::log(1.0));
31}
32
33#ifdef LIBC_TEST_FTZ_DAZ
34
35using namespace LIBC_NAMESPACE::testing;
36
37TEST_F(LlvmLibcLogTest, FTZMode) {
38 ModifyMXCSR mxcsr(FTZ);
39
40 EXPECT_FP_EQ(-0x1.74385446d71c3p9, LIBC_NAMESPACE::log(min_denormal));
41}
42
43TEST_F(LlvmLibcLogTest, DAZMode) {
44 ModifyMXCSR mxcsr(DAZ);
45
46 EXPECT_FP_EQ(FPBits::inf(Sign::NEG).get_val(),
47 LIBC_NAMESPACE::log(min_denormal));
48}
49
50TEST_F(LlvmLibcLogTest, FTZDAZMode) {
51 ModifyMXCSR mxcsr(FTZ | DAZ);
52
53 EXPECT_FP_EQ(FPBits::inf(Sign::NEG).get_val(),
54 LIBC_NAMESPACE::log(min_denormal));
55}
56
57#endif
58

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