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 14 template <typename T> 15 class 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 22 public: 23 typedef T (*LogbFunc)(T); 24 testSpecialNumbers(LogbFunc func)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 testPowersOfTwo(LogbFunc func)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 testSomeIntegers(LogbFunc func)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 testRange(LogbFunc func)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