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 "src/__support/FPUtil/FPBits.h" 13 #include "src/__support/FPUtil/ManipulationFunctions.h" 14 #include "utils/UnitTest/Test.h" 15 #include <math.h> 16 17 #include <limits.h> 18 19 class LlvmLibcILogbTest : public __llvm_libc::testing::Test { 20 public: 21 template <typename T> struct ILogbFunc { typedef int (*Func)(T); }; 22 23 template <typename T> test_special_numbers(typename ILogbFunc<T>::Func func)24 void test_special_numbers(typename ILogbFunc<T>::Func func) { 25 EXPECT_EQ(FP_ILOGB0, func(T(__llvm_libc::fputil::FPBits<T>::zero()))); 26 EXPECT_EQ(FP_ILOGB0, func(T(__llvm_libc::fputil::FPBits<T>::neg_zero()))); 27 28 EXPECT_EQ(FP_ILOGBNAN, 29 func(T(__llvm_libc::fputil::FPBits<T>::build_nan(1)))); 30 31 EXPECT_EQ(INT_MAX, func(T(__llvm_libc::fputil::FPBits<T>::inf()))); 32 EXPECT_EQ(INT_MAX, func(T(__llvm_libc::fputil::FPBits<T>::neg_inf()))); 33 } 34 35 template <typename T> test_powers_of_two(typename ILogbFunc<T>::Func func)36 void test_powers_of_two(typename ILogbFunc<T>::Func func) { 37 EXPECT_EQ(0, func(T(1.0))); 38 EXPECT_EQ(0, func(T(-1.0))); 39 40 EXPECT_EQ(1, func(T(2.0))); 41 EXPECT_EQ(1, func(T(-2.0))); 42 43 EXPECT_EQ(2, func(T(4.0))); 44 EXPECT_EQ(2, func(T(-4.0))); 45 46 EXPECT_EQ(3, func(T(8.0))); 47 EXPECT_EQ(3, func(-8.0)); 48 49 EXPECT_EQ(4, func(16.0)); 50 EXPECT_EQ(4, func(-16.0)); 51 52 EXPECT_EQ(5, func(32.0)); 53 EXPECT_EQ(5, func(-32.0)); 54 } 55 56 template <typename T> test_some_integers(typename ILogbFunc<T>::Func func)57 void test_some_integers(typename ILogbFunc<T>::Func func) { 58 EXPECT_EQ(1, func(T(3.0))); 59 EXPECT_EQ(1, func(T(-3.0))); 60 61 EXPECT_EQ(2, func(T(7.0))); 62 EXPECT_EQ(2, func(T(-7.0))); 63 64 EXPECT_EQ(3, func(T(10.0))); 65 EXPECT_EQ(3, func(T(-10.0))); 66 67 EXPECT_EQ(4, func(T(31.0))); 68 EXPECT_EQ(4, func(-31.0)); 69 70 EXPECT_EQ(5, func(55.0)); 71 EXPECT_EQ(5, func(-55.0)); 72 } 73 74 template <typename T> test_subnormal_range(typename ILogbFunc<T>::Func func)75 void test_subnormal_range(typename ILogbFunc<T>::Func func) { 76 using FPBits = __llvm_libc::fputil::FPBits<T>; 77 using UIntType = typename FPBits::UIntType; 78 constexpr UIntType COUNT = 1000001; 79 constexpr UIntType STEP = 80 (FPBits::MAX_SUBNORMAL - FPBits::MIN_SUBNORMAL) / COUNT; 81 for (UIntType v = FPBits::MIN_SUBNORMAL; v <= FPBits::MAX_SUBNORMAL; 82 v += STEP) { 83 T x = T(FPBits(v)); 84 if (isnan(x) || isinf(x) || x == 0.0) 85 continue; 86 87 int exponent; 88 __llvm_libc::fputil::frexp(x, exponent); 89 ASSERT_EQ(exponent, func(x) + 1); 90 } 91 } 92 93 template <typename T> test_normal_range(typename ILogbFunc<T>::Func func)94 void test_normal_range(typename ILogbFunc<T>::Func func) { 95 using FPBits = __llvm_libc::fputil::FPBits<T>; 96 using UIntType = typename FPBits::UIntType; 97 constexpr UIntType COUNT = 1000001; 98 constexpr UIntType STEP = (FPBits::MAX_NORMAL - FPBits::MIN_NORMAL) / COUNT; 99 for (UIntType v = FPBits::MIN_NORMAL; v <= FPBits::MAX_NORMAL; v += STEP) { 100 T x = T(FPBits(v)); 101 if (isnan(x) || isinf(x) || x == 0.0) 102 continue; 103 104 int exponent; 105 __llvm_libc::fputil::frexp(x, exponent); 106 ASSERT_EQ(exponent, func(x) + 1); 107 } 108 } 109 }; 110 111 #endif // LLVM_LIBC_TEST_SRC_MATH_ILOGBTEST_H 112