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Replace BitUtils with C++20: RotateLeft/RotateRight

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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.
This commit is contained in:
JosJuice
2022-08-05 15:39:00 +02:00
parent 48ce5318e1
commit 454537d53e
11 changed files with 63 additions and 141 deletions
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38
Source/UnitTests/Common/BitUtilsTest.cpp
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@ -57,44 +57,6 @@ TEST(BitUtils, ExtractBits)
EXPECT_EQ((Common::ExtractBits<0, 31, s32, s32>(negative_one)), -1);
}
TEST(BitUtils, RotateLeft)
{
EXPECT_EQ(Common::RotateLeft(0xF0F0F0F0, 0), 0xF0F0F0F0U);
EXPECT_EQ(Common::RotateLeft(0xF0F0F0F0, 4), 0x0F0F0F0FU);
EXPECT_EQ(Common::RotateLeft(0xF0F0F0F0, 8), 0xF0F0F0F0U);
EXPECT_EQ(Common::RotateLeft(0xF0F0F0F0F0F0F0F0, 0), 0xF0F0F0F0F0F0F0F0U);
EXPECT_EQ(Common::RotateLeft(0xF0F0F0F0F0F0F0F0, 4), 0x0F0F0F0F0F0F0F0FU);
EXPECT_EQ(Common::RotateLeft(0xF0F0F0F0F0F0F0F0, 8), 0xF0F0F0F0F0F0F0F0U);
EXPECT_EQ(Common::RotateLeft(0xF1F1F1F1, 1), 0xE3E3E3E3U);
EXPECT_EQ(Common::RotateLeft(0xF1F1F1F1, 2), 0xC7C7C7C7U);
EXPECT_EQ(Common::RotateLeft(0xF1F1F1F1, 3), 0x8F8F8F8FU);
EXPECT_EQ(Common::RotateLeft(0xF1F1F1F1, 4), 0x1F1F1F1FU);
EXPECT_EQ(Common::RotateLeft(0xF1F1F1F1F1F1F1F1, 1), 0xE3E3E3E3E3E3E3E3U);
EXPECT_EQ(Common::RotateLeft(0xF1F1F1F1F1F1F1F1, 2), 0xC7C7C7C7C7C7C7C7U);
EXPECT_EQ(Common::RotateLeft(0xF1F1F1F1F1F1F1F1, 3), 0x8F8F8F8F8F8F8F8FU);
EXPECT_EQ(Common::RotateLeft(0xF1F1F1F1F1F1F1F1, 4), 0x1F1F1F1F1F1F1F1FU);
}
TEST(BitUtils, RotateRight)
{
EXPECT_EQ(Common::RotateRight(0xF0F0F0F0, 0), 0xF0F0F0F0U);
EXPECT_EQ(Common::RotateRight(0xF0F0F0F0, 4), 0x0F0F0F0FU);
EXPECT_EQ(Common::RotateRight(0xF0F0F0F0, 8), 0xF0F0F0F0U);
EXPECT_EQ(Common::RotateRight(0xF0F0F0F0F0F0F0F0, 0), 0xF0F0F0F0F0F0F0F0U);
EXPECT_EQ(Common::RotateRight(0xF0F0F0F0F0F0F0F0, 4), 0x0F0F0F0F0F0F0F0FU);
EXPECT_EQ(Common::RotateRight(0xF0F0F0F0F0F0F0F0, 8), 0xF0F0F0F0F0F0F0F0U);
EXPECT_EQ(Common::RotateRight(0xF1F1F1F1, 1), 0xF8F8F8F8U);
EXPECT_EQ(Common::RotateRight(0xF1F1F1F1, 2), 0x7C7C7C7CU);
EXPECT_EQ(Common::RotateRight(0xF1F1F1F1, 3), 0x3E3E3E3EU);
EXPECT_EQ(Common::RotateRight(0xF1F1F1F1, 4), 0x1F1F1F1FU);
EXPECT_EQ(Common::RotateRight(0xF1F1F1F1F1F1F1F1, 1), 0xF8F8F8F8F8F8F8F8U);
EXPECT_EQ(Common::RotateRight(0xF1F1F1F1F1F1F1F1, 2), 0x7C7C7C7C7C7C7C7CU);
EXPECT_EQ(Common::RotateRight(0xF1F1F1F1F1F1F1F1, 3), 0x3E3E3E3E3E3E3E3EU);
EXPECT_EQ(Common::RotateRight(0xF1F1F1F1F1F1F1F1, 4), 0x1F1F1F1F1F1F1F1FU);
}
TEST(BitUtils, IsValidLowMask)
{
EXPECT_TRUE(Common::IsValidLowMask(0b0u));