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1//===-- Utility class to test countls -------------------*- 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> class CountlsTest : public LIBC_NAMESPACE::testing::Test {14 15 using FXRep = LIBC_NAMESPACE::fixed_point::FXRep<T>;16 static constexpr T zero = FXRep::ZERO();17 static constexpr T max = FXRep::MAX();18 static constexpr T min = FXRep::MIN();19 static constexpr T one_half = FXRep::ONE_HALF();20 static constexpr T one_fourth = FXRep::ONE_FOURTH();21 static constexpr T eps = FXRep::EPS();22 23public:24 typedef int (*CountlsFunc)(T);25 26 void testSpecialNumbers(CountlsFunc func) {27 constexpr bool is_signed = (FXRep::SIGN_LEN > 0);28 29 EXPECT_EQ(FXRep::INTEGRAL_LEN, func(one_half));30 EXPECT_EQ(FXRep::INTEGRAL_LEN + 1, func(one_fourth));31 EXPECT_EQ(FXRep::VALUE_LEN, func(zero));32 EXPECT_EQ(FXRep::VALUE_LEN - 1, func(eps));33 EXPECT_EQ(0, func(max));34 // If signed, left shifting the minimum value will overflow, so countls = 0.35 // If unsigned, the minimum value is zero, so countls is the number of value36 // bits according to ISO/IEC TR 18037.37 EXPECT_EQ(is_signed ? 0 : FXRep::VALUE_LEN, func(min));38 39 if (10 <= static_cast<int>(max))40 EXPECT_EQ(FXRep::INTEGRAL_LEN - 4, func(10));41 42 if (static_cast<int>(min) <= -10)43 EXPECT_EQ(FXRep::INTEGRAL_LEN - 4, func(-10));44 45 if constexpr (is_signed) {46 EXPECT_EQ(FXRep::VALUE_LEN, func(-zero));47 EXPECT_EQ(FXRep::VALUE_LEN, func(-eps));48 EXPECT_EQ(FXRep::INTEGRAL_LEN + 1, func(-one_half));49 if (FXRep::FRACTION_LEN >= 2)50 EXPECT_EQ(FXRep::INTEGRAL_LEN + 2, func(-one_fourth));51 }52 }53};54 55#define LIST_COUNTLS_TESTS(T, func) \56 using LlvmLibcCountlsTest = CountlsTest<T>; \57 TEST_F(LlvmLibcCountlsTest, SpecialNumbers) { testSpecialNumbers(&func); } \58 static_assert(true, "Require semicolon.")59