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1//===-- Utility class to test bitsfx functions ------------------*- 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 "test/UnitTest/Test.h"10 11#include "src/__support/fixed_point/fx_rep.h"12 13template <typename T, typename XType>14class BitsFxTest : public LIBC_NAMESPACE::testing::Test {15 16 using FXRep = LIBC_NAMESPACE::fixed_point::FXRep<T>;17 static constexpr T zero = FXRep::ZERO();18 static constexpr T max = FXRep::MAX();19 static constexpr T min = FXRep::MIN();20 static constexpr T one_half = FXRep::ONE_HALF();21 static constexpr T one_fourth = FXRep::ONE_FOURTH();22 static constexpr T eps = FXRep::EPS();23 24 static constexpr T zero_point_six_eight_seven_five_t = 0.6875;25 26 static constexpr T negative_zero_point_six_eight_seven_five_t = -0.6875;27 28 // an arbitrarily chosen special number29 static constexpr T special_num_t = 10.71875;30 31 static constexpr T negative_special_num_t = -10.71875;32 33public:34 typedef XType (*BitsFxFunc)(T);35 36 void testSpecialNumbers(BitsFxFunc func) {37 EXPECT_EQ(static_cast<XType>(0), func(zero));38 EXPECT_EQ(static_cast<XType>(1ULL << (FXRep::FRACTION_LEN - 1)),39 func(one_half));40 EXPECT_EQ(static_cast<XType>(1ULL << (FXRep::FRACTION_LEN - 2)),41 func(one_fourth));42 EXPECT_EQ(static_cast<XType>(1), func(eps));43 44 // (0.6875)_10 = (0.1011)_245 EXPECT_EQ(static_cast<XType>(11ULL << (FXRep::FRACTION_LEN - 4)),46 func(zero_point_six_eight_seven_five_t));47 48 if constexpr (FXRep::SIGN_LEN > 0)49 EXPECT_EQ(static_cast<XType>(-(11ULL << (FXRep::FRACTION_LEN - 4))),50 func(negative_zero_point_six_eight_seven_five_t));51 52 if constexpr (FXRep::INTEGRAL_LEN > 0) {53 constexpr size_t kMinFbits = 7;54 55 if (max >= 11 && FXRep::FRACTION_LEN >= kMinFbits) {56 // (10.71875)_10 = (1010.1011100)_257 constexpr int64_t kExpected = 1372;58 EXPECT_EQ(59 static_cast<XType>(kExpected << (FXRep::FRACTION_LEN - kMinFbits)),60 func(special_num_t));61 }62 63 if constexpr (FXRep::SIGN_LEN > 0) {64 if (min <= -11 && FXRep::FRACTION_LEN >= kMinFbits) {65 // (-10.71875)_10 = (-1010.1011100)_266 constexpr int64_t kExpected =67 static_cast<int64_t>(static_cast<uint64_t>(-1372)68 << (FXRep::FRACTION_LEN - kMinFbits));69 70 EXPECT_EQ(static_cast<XType>(kExpected),71 func(negative_special_num_t));72 }73 }74 }75 }76};77 78#define LIST_BITSFX_TESTS(Name, T, XType, func) \79 using LlvmLibcBits##Name##Test = BitsFxTest<T, XType>; \80 TEST_F(LlvmLibcBits##Name##Test, SpecialNumbers) { \81 testSpecialNumbers(&func); \82 } \83 static_assert(true, "Require semicolon.")84