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454537d53e
Now that we've flipped the C++20 switch, let's start making use of the nice new <bit> header. I'm planning on handling this move away from BitUtils.h incrementally in a series of PRs. There may be a few functions remaining in BitUtils.h by the end that C++20 doesn't have any equivalents for.
103 lines
3.7 KiB
C++
103 lines
3.7 KiB
C++
// Copyright 2017 Dolphin Emulator Project
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// SPDX-License-Identifier: GPL-2.0-or-later
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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>(), 8u);
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EXPECT_EQ(Common::BitSize<s16>(), 16u);
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EXPECT_EQ(Common::BitSize<s32>(), 32u);
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EXPECT_EQ(Common::BitSize<s64>(), 64u);
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EXPECT_EQ(Common::BitSize<u8>(), 8u);
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EXPECT_EQ(Common::BitSize<u16>(), 16u);
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EXPECT_EQ(Common::BitSize<u32>(), 32u);
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EXPECT_EQ(Common::BitSize<u64>(), 64u);
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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)), 3u);
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EXPECT_EQ((Common::ExtractBits<2, 7>(two_hundred_four_signed)), 51u);
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EXPECT_EQ((Common::ExtractBits<3, 6>(two_hundred_four_signed)), 9u);
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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)), 3u);
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EXPECT_EQ((Common::ExtractBits<2, 7>(two_hundred_four_unsigned)), 51u);
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EXPECT_EQ((Common::ExtractBits<3, 6>(two_hundred_four_unsigned)), 9u);
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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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TEST(BitUtils, IsValidLowMask)
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{
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EXPECT_TRUE(Common::IsValidLowMask(0b0u));
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EXPECT_TRUE(Common::IsValidLowMask(0b1u));
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EXPECT_FALSE(Common::IsValidLowMask(0b10u));
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EXPECT_TRUE(Common::IsValidLowMask(0b11u));
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EXPECT_FALSE(Common::IsValidLowMask(0b1110u));
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EXPECT_TRUE(Common::IsValidLowMask(0b1111u));
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EXPECT_FALSE(Common::IsValidLowMask(0b10000u));
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EXPECT_FALSE(Common::IsValidLowMask(0b101111u));
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EXPECT_TRUE(Common::IsValidLowMask((u8)~0b0));
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EXPECT_FALSE(Common::IsValidLowMask((u8)(~0b0 - 1)));
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EXPECT_FALSE(Common::IsValidLowMask((u8) ~(0b10000)));
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EXPECT_FALSE(Common::IsValidLowMask((u8)(~((u8)(~0b0) >> 1) | 0b1111)));
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EXPECT_TRUE(Common::IsValidLowMask((u16)~0b0));
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EXPECT_FALSE(Common::IsValidLowMask((u16)(~0b0 - 1)));
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EXPECT_FALSE(Common::IsValidLowMask((u16) ~(0b10000)));
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EXPECT_FALSE(Common::IsValidLowMask((u16)(~((u16)(~0b0) >> 1) | 0b1111)));
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EXPECT_TRUE(Common::IsValidLowMask((u32)~0b0));
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EXPECT_FALSE(Common::IsValidLowMask((u32)(~0b0 - 1)));
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EXPECT_FALSE(Common::IsValidLowMask((u32) ~(0b10000)));
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EXPECT_FALSE(Common::IsValidLowMask((u32)(~((u32)(~0b0) >> 1) | 0b1111)));
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EXPECT_TRUE(Common::IsValidLowMask((u64)~0b0));
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EXPECT_FALSE(Common::IsValidLowMask((u64)(~0b0 - 1)));
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EXPECT_FALSE(Common::IsValidLowMask((u64) ~(0b10000)));
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EXPECT_FALSE(Common::IsValidLowMask((u64)(~((u64)(~0b0) >> 1) | 0b1111)));
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}
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TEST(BitUtils, BitCast)
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{
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EXPECT_EQ(0x00000000U, Common::BitCast<u32>(0.0f));
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EXPECT_EQ(0x80000000U, Common::BitCast<u32>(-0.0f));
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EXPECT_EQ(0x3F800000U, Common::BitCast<u32>(1.0f));
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EXPECT_EQ(0xBF800000U, Common::BitCast<u32>(-1.0f));
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EXPECT_EQ(0x0000000000000000ULL, Common::BitCast<u64>(0.0));
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EXPECT_EQ(0x8000000000000000ULL, Common::BitCast<u64>(-0.0));
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EXPECT_EQ(0x3FF0000000000000ULL, Common::BitCast<u64>(1.0));
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EXPECT_EQ(0xBFF0000000000000ULL, Common::BitCast<u64>(-1.0));
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}
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