1 //===-- Utility class to test different flavors of ilogb --------*- 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 #ifndef LLVM_LIBC_TEST_SRC_MATH_ILOGBTEST_H 10 #define LLVM_LIBC_TEST_SRC_MATH_ILOGBTEST_H 11 12 #include "hdr/math_macros.h" 13 #include "src/__support/CPP/limits.h" // INT_MAX 14 #include "src/__support/FPUtil/FPBits.h" 15 #include "src/__support/FPUtil/ManipulationFunctions.h" 16 #include "test/UnitTest/FEnvSafeTest.h" 17 #include "test/UnitTest/Test.h" 18 19 class LlvmLibcILogbTest : public LIBC_NAMESPACE::testing::FEnvSafeTest { 20 public: 21 template <typename T> struct ILogbFunc { 22 typedef int (*Func)(T); 23 }; 24 25 template <typename T> test_special_numbers(typename ILogbFunc<T>::Func func)26 void test_special_numbers(typename ILogbFunc<T>::Func func) { 27 using FPBits = LIBC_NAMESPACE::fputil::FPBits<T>; 28 29 EXPECT_EQ(FP_ILOGB0, func(FPBits::zero(Sign::POS).get_val())); 30 EXPECT_EQ(FP_ILOGB0, func(FPBits::zero(Sign::NEG).get_val())); 31 EXPECT_EQ(FP_ILOGBNAN, func(FPBits::quiet_nan().get_val())); 32 EXPECT_EQ(INT_MAX, func(FPBits::inf(Sign::POS).get_val())); 33 EXPECT_EQ(INT_MAX, func(FPBits::inf(Sign::NEG).get_val())); 34 } 35 36 template <typename T> test_powers_of_two(typename ILogbFunc<T>::Func func)37 void test_powers_of_two(typename ILogbFunc<T>::Func func) { 38 EXPECT_EQ(0, func(T(1.0))); 39 EXPECT_EQ(0, func(T(-1.0))); 40 41 EXPECT_EQ(1, func(T(2.0))); 42 EXPECT_EQ(1, func(T(-2.0))); 43 44 EXPECT_EQ(2, func(T(4.0))); 45 EXPECT_EQ(2, func(T(-4.0))); 46 47 EXPECT_EQ(3, func(T(8.0))); 48 EXPECT_EQ(3, func(-8.0)); 49 50 EXPECT_EQ(4, func(16.0)); 51 EXPECT_EQ(4, func(-16.0)); 52 53 EXPECT_EQ(5, func(32.0)); 54 EXPECT_EQ(5, func(-32.0)); 55 } 56 57 template <typename T> test_some_integers(typename ILogbFunc<T>::Func func)58 void test_some_integers(typename ILogbFunc<T>::Func func) { 59 EXPECT_EQ(1, func(T(3.0))); 60 EXPECT_EQ(1, func(T(-3.0))); 61 62 EXPECT_EQ(2, func(T(7.0))); 63 EXPECT_EQ(2, func(T(-7.0))); 64 65 EXPECT_EQ(3, func(T(10.0))); 66 EXPECT_EQ(3, func(T(-10.0))); 67 68 EXPECT_EQ(4, func(T(31.0))); 69 EXPECT_EQ(4, func(-31.0)); 70 71 EXPECT_EQ(5, func(55.0)); 72 EXPECT_EQ(5, func(-55.0)); 73 } 74 75 template <typename T> test_subnormal_range(typename ILogbFunc<T>::Func func)76 void test_subnormal_range(typename ILogbFunc<T>::Func func) { 77 using FPBits = LIBC_NAMESPACE::fputil::FPBits<T>; 78 using StorageType = typename FPBits::StorageType; 79 constexpr StorageType MIN_SUBNORMAL = FPBits::min_subnormal().uintval(); 80 constexpr StorageType MAX_SUBNORMAL = FPBits::max_subnormal().uintval(); 81 constexpr StorageType COUNT = 10'001; 82 constexpr StorageType STEP = (MAX_SUBNORMAL - MIN_SUBNORMAL) / COUNT; 83 for (StorageType v = MIN_SUBNORMAL; v <= MAX_SUBNORMAL; v += STEP) { 84 T x = FPBits(v).get_val(); 85 if (isnan(x) || isinf(x) || x == 0.0) 86 continue; 87 88 int exponent; 89 LIBC_NAMESPACE::fputil::frexp(x, exponent); 90 ASSERT_EQ(exponent, func(x) + 1); 91 } 92 } 93 94 template <typename T> 95 void test_normal_range(typename ILogbFunc<T>::Func func) { 96 using FPBits = LIBC_NAMESPACE::fputil::FPBits<T>; 97 using StorageType = typename FPBits::StorageType; 98 constexpr StorageType MIN_NORMAL = FPBits::min_normal().uintval(); 99 constexpr StorageType MAX_NORMAL = FPBits::max_normal().uintval(); 100 constexpr StorageType COUNT = 10'001; 101 constexpr StorageType STEP = (MAX_NORMAL - MIN_NORMAL) / COUNT; 102 for (StorageType v = MIN_NORMAL; v <= MAX_NORMAL; v += STEP) { 103 T x = FPBits(v).get_val(); 104 if (isnan(x) || isinf(x) || x == 0.0) 105 continue; 106 107 int exponent; 108 LIBC_NAMESPACE::fputil::frexp(x, exponent); 109 ASSERT_EQ(exponent, func(x) + 1); 110 } 111 } 112 }; 113 114 #endif // LLVM_LIBC_TEST_SRC_MATH_ILOGBTEST_H 115