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 #include "utils/MPFRWrapper/MPFRUtils.h" 14 15 #include "hdr/math_macros.h" 16 17 namespace mpfr = LIBC_NAMESPACE::testing::mpfr; 18 19 template <typename T> 20 class LogbTest : public LIBC_NAMESPACE::testing::FEnvSafeTest { 21 22 DECLARE_SPECIAL_CONSTANTS(T) 23 24 static constexpr StorageType HIDDEN_BIT = 25 StorageType(1) << LIBC_NAMESPACE::fputil::FPBits<T>::FRACTION_LEN; 26 27 public: 28 typedef T (*LogbFunc)(T); 29 testSpecialNumbers(LogbFunc func)30 void testSpecialNumbers(LogbFunc func) { 31 ASSERT_FP_EQ(aNaN, func(aNaN)); 32 ASSERT_FP_EQ(inf, func(inf)); 33 ASSERT_FP_EQ(inf, func(neg_inf)); 34 ASSERT_FP_EQ(neg_inf, func(0.0)); 35 ASSERT_FP_EQ(neg_inf, func(-0.0)); 36 } 37 testPowersOfTwo(LogbFunc func)38 void testPowersOfTwo(LogbFunc func) { 39 EXPECT_FP_EQ(T(0.0), func(T(1.0))); 40 EXPECT_FP_EQ(T(0.0), func(T(-1.0))); 41 42 EXPECT_FP_EQ(T(1.0), func(T(2.0))); 43 EXPECT_FP_EQ(T(1.0), func(T(-2.0))); 44 45 EXPECT_FP_EQ(T(2.0), func(T(4.0))); 46 EXPECT_FP_EQ(T(2.0), func(T(-4.0))); 47 48 EXPECT_FP_EQ(T(3.0), func(T(8.0))); 49 EXPECT_FP_EQ(T(3.0), func(T(-8.0))); 50 51 EXPECT_FP_EQ(T(4.0), func(T(16.0))); 52 EXPECT_FP_EQ(T(4.0), func(T(-16.0))); 53 54 EXPECT_FP_EQ(T(5.0), func(T(32.0))); 55 EXPECT_FP_EQ(T(5.0), func(T(-32.0))); 56 } 57 testSomeIntegers(LogbFunc func)58 void testSomeIntegers(LogbFunc func) { 59 EXPECT_FP_EQ(T(1.0), func(T(3.0))); 60 EXPECT_FP_EQ(T(1.0), func(T(-3.0))); 61 62 EXPECT_FP_EQ(T(2.0), func(T(7.0))); 63 EXPECT_FP_EQ(T(2.0), func(T(-7.0))); 64 65 EXPECT_FP_EQ(T(3.0), func(T(10.0))); 66 EXPECT_FP_EQ(T(3.0), func(T(-10.0))); 67 68 EXPECT_FP_EQ(T(4.0), func(T(31.0))); 69 EXPECT_FP_EQ(T(4.0), func(T(-31.0))); 70 71 EXPECT_FP_EQ(T(5.0), func(T(55.0))); 72 EXPECT_FP_EQ(T(5.0), func(T(-55.0))); 73 } 74 testRange(LogbFunc func)75 void testRange(LogbFunc func) { 76 using StorageType = typename FPBits::StorageType; 77 constexpr StorageType COUNT = 100'000; 78 constexpr StorageType STEP = STORAGE_MAX / COUNT; 79 for (StorageType i = 0, v = 0; i <= COUNT; ++i, v += STEP) { 80 T x = FPBits(v).get_val(); 81 if (FPBits(v).is_nan() || FPBits(v).is_inf() || x == 0.0l) 82 continue; 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