1 //===-- Unittests for log2 ------------------------------------------------===//
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/log2.h"
13 #include "test/UnitTest/FPMatcher.h"
14 #include "test/UnitTest/Test.h"
15
16 #include <stdint.h>
17
18 using LlvmLibcLog2Test = LIBC_NAMESPACE::testing::FPTest<double>;
19
TEST_F(LlvmLibcLog2Test,SpecialNumbers)20 TEST_F(LlvmLibcLog2Test, SpecialNumbers) {
21 EXPECT_FP_EQ(aNaN, LIBC_NAMESPACE::log2(aNaN));
22 EXPECT_FP_EQ(inf, LIBC_NAMESPACE::log2(inf));
23 EXPECT_FP_IS_NAN_WITH_EXCEPTION(LIBC_NAMESPACE::log2(neg_inf), FE_INVALID);
24 EXPECT_FP_EQ_WITH_EXCEPTION(neg_inf, LIBC_NAMESPACE::log2(0.0), FE_DIVBYZERO);
25 EXPECT_FP_EQ_WITH_EXCEPTION(neg_inf, LIBC_NAMESPACE::log2(-0.0),
26 FE_DIVBYZERO);
27 EXPECT_FP_IS_NAN_WITH_EXCEPTION(LIBC_NAMESPACE::log2(-1.0), FE_INVALID);
28 EXPECT_FP_EQ_ALL_ROUNDING(zero, LIBC_NAMESPACE::log2(1.0));
29 }
30
31 #ifdef LIBC_TEST_FTZ_DAZ
32
33 using namespace LIBC_NAMESPACE::testing;
34
TEST_F(LlvmLibcLog2Test,FTZMode)35 TEST_F(LlvmLibcLog2Test, FTZMode) {
36 ModifyMXCSR mxcsr(FTZ);
37
38 EXPECT_FP_EQ(-1074.0, LIBC_NAMESPACE::log2(min_denormal));
39 }
40
TEST_F(LlvmLibcLog2Test,DAZMode)41 TEST_F(LlvmLibcLog2Test, DAZMode) {
42 ModifyMXCSR mxcsr(DAZ);
43
44 EXPECT_FP_EQ(FPBits::inf(Sign::NEG).get_val(),
45 LIBC_NAMESPACE::log2(min_denormal));
46 }
47
TEST_F(LlvmLibcLog2Test,FTZDAZMode)48 TEST_F(LlvmLibcLog2Test, FTZDAZMode) {
49 ModifyMXCSR mxcsr(FTZ | DAZ);
50
51 EXPECT_FP_EQ(FPBits::inf(Sign::NEG).get_val(),
52 LIBC_NAMESPACE::log2(min_denormal));
53 }
54
55 #endif
56