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

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