| //===-- Utility class to test different flavors of ilogb --------*- C++ -*-===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef LLVM_LIBC_TEST_SRC_MATH_ILOGBTEST_H |
| #define LLVM_LIBC_TEST_SRC_MATH_ILOGBTEST_H |
| |
| #include "src/__support/FPUtil/FPBits.h" |
| #include "src/__support/FPUtil/ManipulationFunctions.h" |
| #include "utils/UnitTest/Test.h" |
| #include <math.h> |
| |
| #include <limits.h> |
| |
| class LlvmLibcILogbTest : public __llvm_libc::testing::Test { |
| public: |
| template <typename T> struct ILogbFunc { typedef int (*Func)(T); }; |
| |
| template <typename T> |
| void testSpecialNumbers(typename ILogbFunc<T>::Func func) { |
| EXPECT_EQ(FP_ILOGB0, func(T(__llvm_libc::fputil::FPBits<T>::zero()))); |
| EXPECT_EQ(FP_ILOGB0, func(T(__llvm_libc::fputil::FPBits<T>::negZero()))); |
| |
| EXPECT_EQ(FP_ILOGBNAN, |
| func(T(__llvm_libc::fputil::FPBits<T>::buildNaN(1)))); |
| |
| EXPECT_EQ(INT_MAX, func(T(__llvm_libc::fputil::FPBits<T>::inf()))); |
| EXPECT_EQ(INT_MAX, func(T(__llvm_libc::fputil::FPBits<T>::negInf()))); |
| } |
| |
| template <typename T> void testPowersOfTwo(typename ILogbFunc<T>::Func func) { |
| EXPECT_EQ(0, func(T(1.0))); |
| EXPECT_EQ(0, func(T(-1.0))); |
| |
| EXPECT_EQ(1, func(T(2.0))); |
| EXPECT_EQ(1, func(T(-2.0))); |
| |
| EXPECT_EQ(2, func(T(4.0))); |
| EXPECT_EQ(2, func(T(-4.0))); |
| |
| EXPECT_EQ(3, func(T(8.0))); |
| EXPECT_EQ(3, func(-8.0)); |
| |
| EXPECT_EQ(4, func(16.0)); |
| EXPECT_EQ(4, func(-16.0)); |
| |
| EXPECT_EQ(5, func(32.0)); |
| EXPECT_EQ(5, func(-32.0)); |
| } |
| |
| template <typename T> |
| void testSomeIntegers(typename ILogbFunc<T>::Func func) { |
| EXPECT_EQ(1, func(T(3.0))); |
| EXPECT_EQ(1, func(T(-3.0))); |
| |
| EXPECT_EQ(2, func(T(7.0))); |
| EXPECT_EQ(2, func(T(-7.0))); |
| |
| EXPECT_EQ(3, func(T(10.0))); |
| EXPECT_EQ(3, func(T(-10.0))); |
| |
| EXPECT_EQ(4, func(T(31.0))); |
| EXPECT_EQ(4, func(-31.0)); |
| |
| EXPECT_EQ(5, func(55.0)); |
| EXPECT_EQ(5, func(-55.0)); |
| } |
| |
| template <typename T> |
| void testSubnormalRange(typename ILogbFunc<T>::Func func) { |
| using FPBits = __llvm_libc::fputil::FPBits<T>; |
| using UIntType = typename FPBits::UIntType; |
| constexpr UIntType count = 1000001; |
| constexpr UIntType step = |
| (FPBits::maxSubnormal - FPBits::minSubnormal) / count; |
| for (UIntType v = FPBits::minSubnormal; v <= FPBits::maxSubnormal; |
| v += step) { |
| T x = T(FPBits(v)); |
| if (isnan(x) || isinf(x) || x == 0.0) |
| continue; |
| |
| int exponent; |
| __llvm_libc::fputil::frexp(x, exponent); |
| ASSERT_EQ(exponent, func(x) + 1); |
| } |
| } |
| |
| template <typename T> void testNormalRange(typename ILogbFunc<T>::Func func) { |
| using FPBits = __llvm_libc::fputil::FPBits<T>; |
| using UIntType = typename FPBits::UIntType; |
| constexpr UIntType count = 1000001; |
| constexpr UIntType step = (FPBits::maxNormal - FPBits::minNormal) / count; |
| for (UIntType v = FPBits::minNormal; v <= FPBits::maxNormal; v += step) { |
| T x = T(FPBits(v)); |
| if (isnan(x) || isinf(x) || x == 0.0) |
| continue; |
| |
| int exponent; |
| __llvm_libc::fputil::frexp(x, exponent); |
| ASSERT_EQ(exponent, func(x) + 1); |
| } |
| } |
| }; |
| |
| #endif // LLVM_LIBC_TEST_SRC_MATH_ILOGBTEST_H |