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60 lines
1.9 KiB
C++
60 lines
1.9 KiB
C++
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// Copyright 2017 Dolphin Emulator Project
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// Licensed under GPLv2+
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// Refer to the license.txt file included.
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#include <gtest/gtest.h>
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#include "Common/BitUtils.h"
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#include "Common/CommonTypes.h"
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TEST(BitUtils, BitSize)
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{
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EXPECT_EQ(Common::BitSize<s8>(), 8);
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EXPECT_EQ(Common::BitSize<s16>(), 16);
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EXPECT_EQ(Common::BitSize<s32>(), 32);
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EXPECT_EQ(Common::BitSize<s64>(), 64);
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EXPECT_EQ(Common::BitSize<u8>(), 8);
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EXPECT_EQ(Common::BitSize<u16>(), 16);
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EXPECT_EQ(Common::BitSize<u32>(), 32);
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EXPECT_EQ(Common::BitSize<u64>(), 64);
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}
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TEST(BitUtils, ExtractBit)
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{
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constexpr s32 zero = 0;
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EXPECT_EQ(Common::ExtractBit<0>(zero), 0);
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constexpr s32 one = 1;
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EXPECT_EQ(Common::ExtractBit<0>(one), 1);
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constexpr s32 negative_one = -1;
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EXPECT_EQ(Common::ExtractBit<31>(negative_one), 1);
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constexpr s32 one_hundred_twenty_eight = 0b10000000;
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EXPECT_EQ(Common::ExtractBit<7>(one_hundred_twenty_eight), 1);
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}
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TEST(BitUtils, ExtractBits)
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{
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// Note: Parenthesizing is necessary to prevent the macros from
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// mangling the template function usages.
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constexpr s32 two_hundred_four_signed = 0b0011001100;
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EXPECT_EQ((Common::ExtractBits<2, 3>(two_hundred_four_signed)), 3);
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EXPECT_EQ((Common::ExtractBits<2, 7>(two_hundred_four_signed)), 51);
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EXPECT_EQ((Common::ExtractBits<3, 6>(two_hundred_four_signed)), 9);
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constexpr u32 two_hundred_four_unsigned = 0b0011001100;
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EXPECT_EQ((Common::ExtractBits<2, 3>(two_hundred_four_unsigned)), 3);
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EXPECT_EQ((Common::ExtractBits<2, 7>(two_hundred_four_unsigned)), 51);
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EXPECT_EQ((Common::ExtractBits<3, 6>(two_hundred_four_unsigned)), 9);
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// Ensure bit extraction remains sign-independent even when signed types are used.
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constexpr s32 negative_one = -1;
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EXPECT_EQ((Common::ExtractBits<0, 31>(negative_one)), 0xFFFFFFFFU);
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// Ensure bit extraction with type overriding works as expected
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EXPECT_EQ((Common::ExtractBits<0, 31, s32, s32>(negative_one)), -1);
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}
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