1//===-- Utility class to test logb[f|l] -------------------------*- C++ -*-===//
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/__support/CPP/algorithm.h"
10#include "src/__support/FPUtil/ManipulationFunctions.h"
11#include "test/UnitTest/FEnvSafeTest.h"
12#include "test/UnitTest/FPMatcher.h"
13#include "test/UnitTest/Test.h"
14
15template <typename T>
16class LogbTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
17
18 DECLARE_SPECIAL_CONSTANTS(T)
19
20 static constexpr StorageType HIDDEN_BIT =
21 StorageType(1) << LIBC_NAMESPACE::fputil::FPBits<T>::FRACTION_LEN;
22
23public:
24 typedef T (*LogbFunc)(T);
25
26 void testSpecialNumbers(LogbFunc func) {
27 ASSERT_FP_EQ(aNaN, func(aNaN));
28 ASSERT_FP_EQ(inf, func(inf));
29 ASSERT_FP_EQ(inf, func(neg_inf));
30 ASSERT_FP_EQ(neg_inf, func(zero));
31 ASSERT_FP_EQ(neg_inf, func(neg_zero));
32 }
33
34 void testPowersOfTwo(LogbFunc func) {
35 EXPECT_FP_EQ(T(0.0), func(T(1.0)));
36 EXPECT_FP_EQ(T(0.0), func(T(-1.0)));
37
38 EXPECT_FP_EQ(T(1.0), func(T(2.0)));
39 EXPECT_FP_EQ(T(1.0), func(T(-2.0)));
40
41 EXPECT_FP_EQ(T(2.0), func(T(4.0)));
42 EXPECT_FP_EQ(T(2.0), func(T(-4.0)));
43
44 EXPECT_FP_EQ(T(3.0), func(T(8.0)));
45 EXPECT_FP_EQ(T(3.0), func(T(-8.0)));
46
47 EXPECT_FP_EQ(T(4.0), func(T(16.0)));
48 EXPECT_FP_EQ(T(4.0), func(T(-16.0)));
49
50 EXPECT_FP_EQ(T(5.0), func(T(32.0)));
51 EXPECT_FP_EQ(T(5.0), func(T(-32.0)));
52 }
53
54 void testSomeIntegers(LogbFunc func) {
55 EXPECT_FP_EQ(T(1.0), func(T(3.0)));
56 EXPECT_FP_EQ(T(1.0), func(T(-3.0)));
57
58 EXPECT_FP_EQ(T(2.0), func(T(7.0)));
59 EXPECT_FP_EQ(T(2.0), func(T(-7.0)));
60
61 EXPECT_FP_EQ(T(3.0), func(T(10.0)));
62 EXPECT_FP_EQ(T(3.0), func(T(-10.0)));
63
64 EXPECT_FP_EQ(T(4.0), func(T(31.0)));
65 EXPECT_FP_EQ(T(4.0), func(T(-31.0)));
66
67 EXPECT_FP_EQ(T(5.0), func(T(55.0)));
68 EXPECT_FP_EQ(T(5.0), func(T(-55.0)));
69 }
70
71 void testRange(LogbFunc func) {
72 using StorageType = typename FPBits::StorageType;
73 constexpr int COUNT = 100'000;
74 constexpr StorageType STEP = LIBC_NAMESPACE::cpp::max(
75 static_cast<StorageType>(STORAGE_MAX / COUNT), StorageType(1));
76 StorageType v = 0;
77 for (int i = 0; i <= COUNT; ++i, v += STEP) {
78 FPBits x_bits(v);
79 if (x_bits.is_zero() || x_bits.is_inf_or_nan())
80 continue;
81
82 T x = x_bits.get_val();
83
84 int exponent;
85 LIBC_NAMESPACE::fputil::frexp(x, exponent);
86 ASSERT_FP_EQ(T(exponent), func(x) + T(1.0));
87 }
88 }
89};
90
91#define LIST_LOGB_TESTS(T, func) \
92 using LlvmLibcLogbTest = LogbTest<T>; \
93 TEST_F(LlvmLibcLogbTest, SpecialNumbers) { testSpecialNumbers(&func); } \
94 TEST_F(LlvmLibcLogbTest, PowersOfTwo) { testPowersOfTwo(&func); } \
95 TEST_F(LlvmLibcLogbTest, SomeIntegers) { testSomeIntegers(&func); } \
96 TEST_F(LlvmLibcLogbTest, InRange) { testRange(&func); }
97

source code of libc/test/src/math/smoke/LogbTest.h