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1//===-- Utility class to test int to fixed point conversions ----*- 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/CPP/bit.h"12#include "src/__support/fixed_point/fx_bits.h"13 14template <typename T, typename XType>15class FxBitsTest : public LIBC_NAMESPACE::testing::Test {16 using FXRep = LIBC_NAMESPACE::fixed_point::FXRep<T>;17 static constexpr T zero = FXRep::ZERO();18 static constexpr T min = FXRep::MIN();19 static constexpr T max = FXRep::MAX();20 static constexpr T half = static_cast<T>(0.5);21 static constexpr T quarter = static_cast<T>(0.25);22 static constexpr T one =23 (FXRep::INTEGRAL_LEN > 0) ? static_cast<T>(1) : FXRep::MAX();24 static constexpr T eps = FXRep::EPS();25 constexpr XType get_one_or_saturated_fraction() {26 if (FXRep::INTEGRAL_LEN > 0) {27 return static_cast<XType>(static_cast<XType>(0x1) << FXRep::FRACTION_LEN);28 } else {29 return static_cast<XType>(30 LIBC_NAMESPACE::mask_trailing_ones<typename FXRep::StorageType,31 FXRep::FRACTION_LEN>());32 }33 }34 35public:36 typedef T (*FxBitsFunc)(XType);37 38 void test_special_numbers(FxBitsFunc func) {39 EXPECT_EQ(zero, func(0));40 EXPECT_EQ(eps, func(0x1));41 // x.1000...42 EXPECT_EQ(half, func(static_cast<XType>(0x1) << (FXRep::FRACTION_LEN - 1)));43 // Occupy the bit to the left of the fixed point for Accum types44 // Saturate fraction portion for Fract types45 EXPECT_EQ(one, func(get_one_or_saturated_fraction()));46 }47};48 49#define LIST_FXBITS_TEST(Name, T, XType, func) \50 using LlvmLibc##Name##BitsTest = FxBitsTest<T, XType>; \51 TEST_F(LlvmLibc##Name##BitsTest, SpecialNumbers) { \52 test_special_numbers(&func); \53 } \54 static_assert(true, "Require semicolon.")55