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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-exception6//7//===----------------------------------------------------------------------===//8 9#include "src/__support/CPP/algorithm.h"10#include "src/__support/FPUtil/ManipulationFunctions.h"11#include "test/UnitTest/FEnvSafeTest.h"12#include "test/UnitTest/FPMatcher.h"13#include "test/UnitTest/Test.h"14 15template <typename T>16class LogbTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {17 18 DECLARE_SPECIAL_CONSTANTS(T)19 20 static constexpr StorageType HIDDEN_BIT =21 StorageType(1) << LIBC_NAMESPACE::fputil::FPBits<T>::FRACTION_LEN;22 23public:24 typedef T (*LogbFunc)(T);25 26 void testSpecialNumbers(LogbFunc func) {27 ASSERT_FP_EQ(aNaN, func(aNaN));28 ASSERT_FP_EQ(inf, func(inf));29 ASSERT_FP_EQ(inf, func(neg_inf));30 ASSERT_FP_EQ(neg_inf, func(zero));31 ASSERT_FP_EQ(neg_inf, func(neg_zero));32 }33 34 void testPowersOfTwo(LogbFunc func) {35 EXPECT_FP_EQ(T(0.0), func(T(1.0)));36 EXPECT_FP_EQ(T(0.0), func(T(-1.0)));37 38 EXPECT_FP_EQ(T(1.0), func(T(2.0)));39 EXPECT_FP_EQ(T(1.0), func(T(-2.0)));40 41 EXPECT_FP_EQ(T(2.0), func(T(4.0)));42 EXPECT_FP_EQ(T(2.0), func(T(-4.0)));43 44 EXPECT_FP_EQ(T(3.0), func(T(8.0)));45 EXPECT_FP_EQ(T(3.0), func(T(-8.0)));46 47 EXPECT_FP_EQ(T(4.0), func(T(16.0)));48 EXPECT_FP_EQ(T(4.0), func(T(-16.0)));49 50 EXPECT_FP_EQ(T(5.0), func(T(32.0)));51 EXPECT_FP_EQ(T(5.0), func(T(-32.0)));52 }53 54 void testSomeIntegers(LogbFunc func) {55 EXPECT_FP_EQ(T(1.0), func(T(3.0)));56 EXPECT_FP_EQ(T(1.0), func(T(-3.0)));57 58 EXPECT_FP_EQ(T(2.0), func(T(7.0)));59 EXPECT_FP_EQ(T(2.0), func(T(-7.0)));60 61 EXPECT_FP_EQ(T(3.0), func(T(10.0)));62 EXPECT_FP_EQ(T(3.0), func(T(-10.0)));63 64 EXPECT_FP_EQ(T(4.0), func(T(31.0)));65 EXPECT_FP_EQ(T(4.0), func(T(-31.0)));66 67 EXPECT_FP_EQ(T(5.0), func(T(55.0)));68 EXPECT_FP_EQ(T(5.0), func(T(-55.0)));69 }70 71 void testRange(LogbFunc func) {72 using StorageType = typename FPBits::StorageType;73 constexpr int COUNT = 100'000;74 constexpr StorageType STEP = LIBC_NAMESPACE::cpp::max(75 static_cast<StorageType>(STORAGE_MAX / COUNT), StorageType(1));76 StorageType v = 0;77 for (int i = 0; i <= COUNT; ++i, v += STEP) {78 FPBits x_bits(v);79 if (x_bits.is_zero() || x_bits.is_inf_or_nan())80 continue;81 82 T x = x_bits.get_val();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