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59 lines
1.8 KiB
C++
59 lines
1.8 KiB
C++
/*
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* This file is part of OpenTTD.
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* OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
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* OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** @file bitmath_func_test.cpp Test functionality from core/bitmath_func. */
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#include "../stdafx.h"
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#include "../3rdparty/catch2/catch.hpp"
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#include "../core/bitmath_func.hpp"
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extern uint8 FindLastBit64(uint64 x);
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TEST_CASE("FindLastBit tests")
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{
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CHECK(FindLastBit<uint8>(0) == 0);
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CHECK(FindLastBit<uint16>(0) == 0);
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CHECK(FindLastBit<uint32>(0) == 0);
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CHECK(FindLastBit<uint64>(0) == 0);
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CHECK(FindLastBit64(0) == 0);
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for (uint i = 0; i < 8; i++) {
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uint8 t = (uint8)(1 << i);
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CHECK(FindLastBit<uint8>(t) == i);
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CHECK(FindLastBit<uint16>(t) == i);
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CHECK(FindLastBit<uint32>(t) == i);
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CHECK(FindLastBit<uint64>(t) == i);
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CHECK(FindLastBit64(t) == i);
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}
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for (uint i = 8; i < 16; i++) {
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uint16 t = (uint16)(1 << i);
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CHECK(FindLastBit<uint16>(t) == i);
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CHECK(FindLastBit<uint32>(t) == i);
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CHECK(FindLastBit<uint64>(t) == i);
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CHECK(FindLastBit64(t) == i);
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}
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for (uint i = 16; i < 32; i++) {
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uint32 t = (1 << i);
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CHECK(FindLastBit<uint32>(t) == i);
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CHECK(FindLastBit<uint64>(t) == i);
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CHECK(FindLastBit64(t) == i);
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}
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for (uint i = 32; i < 64; i++) {
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uint64 t = (((uint64)1) << i);
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CHECK(FindLastBit<uint64>(t) == i);
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CHECK(FindLastBit64(t) == i);
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}
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CHECK(FindLastBit(0x42) == FindLastBit(0x40));
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CHECK(FindLastBit(0xAAAA) == FindLastBit(0x8000));
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}
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