91 lines
2.9 KiB
C++
91 lines
2.9 KiB
C++
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// Copyright 2019 Citra Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#include <array>
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#include <cstring>
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#include <type_traits>
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#include <catch2/catch.hpp>
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#include "common/bit_field.h"
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TEST_CASE("BitField", "[common]") {
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enum class TestEnum : u32 {
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A = 0b10111101,
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B = 0b10101110,
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C = 0b00001111,
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};
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union LEBitField {
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u32_le raw;
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BitField<0, 6, u32> a;
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BitField<6, 4, s32> b;
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BitField<10, 8, TestEnum> c;
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BitField<18, 14, u32> d;
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} le_bitfield;
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union BEBitField {
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u32_be raw;
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BitFieldBE<0, 6, u32> a;
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BitFieldBE<6, 4, s32> b;
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BitFieldBE<10, 8, TestEnum> c;
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BitFieldBE<18, 14, u32> d;
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} be_bitfield;
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static_assert(sizeof(LEBitField) == sizeof(u32));
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static_assert(sizeof(BEBitField) == sizeof(u32));
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static_assert(std::is_trivially_copyable_v<LEBitField>);
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static_assert(std::is_trivially_copyable_v<BEBitField>);
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std::array<u8, 4> raw{{
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0b01101100,
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0b11110110,
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0b10111010,
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0b11101100,
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}};
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std::memcpy(&le_bitfield, &raw, sizeof(raw));
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std::memcpy(&be_bitfield, &raw, sizeof(raw));
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// bit fields: 11101100101110'10111101'1001'101100
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REQUIRE(le_bitfield.raw == 0b11101100'10111010'11110110'01101100);
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REQUIRE(le_bitfield.a == 0b101100);
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REQUIRE(le_bitfield.b == -7); // 1001 as two's complement
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REQUIRE(le_bitfield.c == TestEnum::A);
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REQUIRE(le_bitfield.d == 0b11101100101110);
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le_bitfield.a.Assign(0b000111);
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le_bitfield.b.Assign(-1);
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le_bitfield.c.Assign(TestEnum::C);
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le_bitfield.d.Assign(0b01010101010101);
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std::memcpy(&raw, &le_bitfield, sizeof(raw));
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// bit fields: 01010101010101'00001111'1111'000111
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REQUIRE(le_bitfield.raw == 0b01010101'01010100'00111111'11000111);
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REQUIRE(raw == std::array<u8, 4>{{
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0b11000111,
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0b00111111,
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0b01010100,
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0b01010101,
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}});
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// bit fields: 01101100111101'10101110'1011'101100
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REQUIRE(be_bitfield.raw == 0b01101100'11110110'10111010'11101100);
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REQUIRE(be_bitfield.a == 0b101100);
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REQUIRE(be_bitfield.b == -5); // 1011 as two's complement
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REQUIRE(be_bitfield.c == TestEnum::B);
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REQUIRE(be_bitfield.d == 0b01101100111101);
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be_bitfield.a.Assign(0b000111);
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be_bitfield.b.Assign(-1);
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be_bitfield.c.Assign(TestEnum::C);
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be_bitfield.d.Assign(0b01010101010101);
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std::memcpy(&raw, &be_bitfield, sizeof(raw));
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// bit fields: 01010101010101'00001111'1111'000111
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REQUIRE(be_bitfield.raw == 0b01010101'01010100'00111111'11000111);
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REQUIRE(raw == std::array<u8, 4>{{
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0b01010101,
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0b01010100,
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0b00111111,
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0b11000111,
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}});
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}
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