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-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #include "test/UnitTest/Test.h" 10 11 #include "src/__support/fixed_point/fx_rep.h" 12 13 template <typename T, typename XType> 14 class 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 number 29 static constexpr T special_num_t = 10.71875; 30 31 static constexpr T negative_special_num_t = -10.71875; 32 33 public: 34 typedef XType (*BitsFxFunc)(T); 35 testSpecialNumbers(BitsFxFunc func)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)_2 45 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)_2 57 constexpr long long 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)_2 66 constexpr long long kExpected = -1372; 67 EXPECT_EQ(static_cast<XType>(kExpected 68 << (FXRep::FRACTION_LEN - kMinFbits)), 69 func(negative_special_num_t)); 70 } 71 } 72 } 73 } 74 }; 75 76 #define LIST_BITSFX_TESTS(Name, T, XType, func) \ 77 using LlvmLibcBits##Name##Test = BitsFxTest<T, XType>; \ 78 TEST_F(LlvmLibcBits##Name##Test, SpecialNumbers) { \ 79 testSpecialNumbers(&func); \ 80 } \ 81 static_assert(true, "Require semicolon.") 82