1 //===-- Unittests for logbl -----------------------------------------------===//
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 "src/math/logbl.h"
10 #include "utils/FPUtil/FPBits.h"
11 #include "utils/FPUtil/ManipulationFunctions.h"
12 #include "utils/UnitTest/Test.h"
13 #include <math.h>
14 
15 typedef long double LD;
16 using FPBits = __llvm_libc::fputil::FPBits<long double>;
17 
18 TEST(LlvmLibclogblTest, SpecialNumbers) {
19   EXPECT_TRUE(LD(FPBits::inf()) == __llvm_libc::logbl(LD(FPBits::inf())));
20   EXPECT_TRUE(LD(FPBits::inf()) == __llvm_libc::logbl(LD(FPBits::negInf())));
21 
22   EXPECT_TRUE(LD(FPBits::negInf()) == __llvm_libc::logbl(LD(FPBits::zero())));
23   EXPECT_TRUE(LD(FPBits::negInf()) ==
24               __llvm_libc::logbl(LD(FPBits::negZero())));
25 
26   EXPECT_TRUE(FPBits(__llvm_libc::logbl(LD(FPBits::buildNaN(1)))).isNaN());
27 }
28 
29 TEST(LlvmLibclogblTest, PowersOfTwo) {
30   EXPECT_TRUE(0.0l == __llvm_libc::logbl(1.0l));
31   EXPECT_TRUE(0.0l == __llvm_libc::logbl(-1.0l));
32 
33   EXPECT_TRUE(1.0l == __llvm_libc::logbl(2.0l));
34   EXPECT_TRUE(1.0l == __llvm_libc::logbl(-2.0l));
35 
36   EXPECT_TRUE(2.0l == __llvm_libc::logbl(4.0l));
37   EXPECT_TRUE(2.0l == __llvm_libc::logbl(-4.0l));
38 
39   EXPECT_TRUE(3.0l == __llvm_libc::logbl(8.0l));
40   EXPECT_TRUE(3.0l == __llvm_libc::logbl(-8.0l));
41 
42   EXPECT_TRUE(4.0l == __llvm_libc::logbl(16.0l));
43   EXPECT_TRUE(4.0l == __llvm_libc::logbl(-16.0l));
44 
45   EXPECT_TRUE(5.0l == __llvm_libc::logbl(32.0l));
46   EXPECT_TRUE(5.0l == __llvm_libc::logbl(-32.0l));
47 }
48 
49 TEST(LlvmLibcLogbTest, SomeIntegers) {
50   EXPECT_TRUE(1.0l == __llvm_libc::logbl(3.0l));
51   EXPECT_TRUE(1.0l == __llvm_libc::logbl(-3.0l));
52 
53   EXPECT_TRUE(2.0l == __llvm_libc::logbl(7.0l));
54   EXPECT_TRUE(2.0l == __llvm_libc::logbl(-7.0l));
55 
56   EXPECT_TRUE(3.0l == __llvm_libc::logbl(10.0l));
57   EXPECT_TRUE(3.0l == __llvm_libc::logbl(-10.0l));
58 
59   EXPECT_TRUE(4.0l == __llvm_libc::logbl(31.0l));
60   EXPECT_TRUE(4.0l == __llvm_libc::logbl(-31.0l));
61 
62   EXPECT_TRUE(5.0l == __llvm_libc::logbl(55.0l));
63   EXPECT_TRUE(5.0l == __llvm_libc::logbl(-55.0l));
64 }
65 
66 TEST(LlvmLibcLogblTest, LongDoubleRange) {
67   using UIntType = FPBits::UIntType;
68   constexpr UIntType count = 10000000;
69   constexpr UIntType step = UIntType(-1) / count;
70   for (UIntType i = 0, v = 0; i <= count; ++i, v += step) {
71     long double x = LD(FPBits(v));
72     if (isnan(x) || isinf(x) || x == 0.0l)
73       continue;
74 
75     int exponent;
76     __llvm_libc::fputil::frexp(x, exponent);
77     ASSERT_TRUE((long double)(exponent) == __llvm_libc::logbl(x) + 1.0l);
78   }
79 }
80