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