1 //===-- Unittests for 2^x -------------------------------------------------===//
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/exp2.h"
13 #include "test/UnitTest/FPMatcher.h"
14 #include "test/UnitTest/Test.h"
15
16 #include <stdint.h>
17
18 using LlvmLibcExp2Test = LIBC_NAMESPACE::testing::FPTest<double>;
19
TEST_F(LlvmLibcExp2Test,SpecialNumbers)20 TEST_F(LlvmLibcExp2Test, SpecialNumbers) {
21 EXPECT_FP_EQ(aNaN, LIBC_NAMESPACE::exp2(aNaN));
22 EXPECT_FP_EQ(inf, LIBC_NAMESPACE::exp2(inf));
23 EXPECT_FP_EQ_ALL_ROUNDING(zero, LIBC_NAMESPACE::exp2(neg_inf));
24 EXPECT_FP_EQ_WITH_EXCEPTION(zero, LIBC_NAMESPACE::exp2(-0x1.0p20),
25 FE_UNDERFLOW);
26 EXPECT_FP_EQ_WITH_EXCEPTION(inf, LIBC_NAMESPACE::exp2(0x1.0p20), FE_OVERFLOW);
27 EXPECT_FP_EQ_ALL_ROUNDING(1.0, LIBC_NAMESPACE::exp2(0.0));
28 EXPECT_FP_EQ_ALL_ROUNDING(1.0, LIBC_NAMESPACE::exp2(-0.0));
29 EXPECT_FP_EQ_ALL_ROUNDING(2.0, LIBC_NAMESPACE::exp2(1.0));
30 EXPECT_FP_EQ_ALL_ROUNDING(0.5, LIBC_NAMESPACE::exp2(-1.0));
31 EXPECT_FP_EQ_ALL_ROUNDING(4.0, LIBC_NAMESPACE::exp2(2.0));
32 EXPECT_FP_EQ_ALL_ROUNDING(0.25, LIBC_NAMESPACE::exp2(-2.0));
33 }
34
35 #ifdef LIBC_TEST_FTZ_DAZ
36
37 using namespace LIBC_NAMESPACE::testing;
38
TEST_F(LlvmLibcExp2Test,FTZMode)39 TEST_F(LlvmLibcExp2Test, FTZMode) {
40 ModifyMXCSR mxcsr(FTZ);
41
42 EXPECT_FP_EQ(1.0, LIBC_NAMESPACE::exp2(min_denormal));
43 EXPECT_FP_EQ(1.0, LIBC_NAMESPACE::exp2(max_denormal));
44 }
45
TEST_F(LlvmLibcExp2Test,DAZMode)46 TEST_F(LlvmLibcExp2Test, DAZMode) {
47 ModifyMXCSR mxcsr(DAZ);
48
49 EXPECT_FP_EQ(1.0, LIBC_NAMESPACE::exp2(min_denormal));
50 EXPECT_FP_EQ(1.0, LIBC_NAMESPACE::exp2(max_denormal));
51 }
52
TEST_F(LlvmLibcExp2Test,FTZDAZMode)53 TEST_F(LlvmLibcExp2Test, FTZDAZMode) {
54 ModifyMXCSR mxcsr(FTZ | DAZ);
55
56 EXPECT_FP_EQ(1.0, LIBC_NAMESPACE::exp2(min_denormal));
57 EXPECT_FP_EQ(1.0, LIBC_NAMESPACE::exp2(max_denormal));
58 }
59
60 #endif
61