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 15 template <typename T> 16 class 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 23 public: 24 typedef T (*LogbFunc)(T); 25 testSpecialNumbers(LogbFunc func)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 testPowersOfTwo(LogbFunc func)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 testSomeIntegers(LogbFunc func)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 testRange(LogbFunc func)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