56 lines
1.5 KiB
C++
56 lines
1.5 KiB
C++
// This file is part of the mcl project.
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// Copyright (c) 2022 merryhime
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// SPDX-License-Identifier: MIT
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#pragma once
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#include "mcl/concepts/bit_integral.hpp"
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namespace mcl::bit {
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constexpr u16 swap_bytes_16(u16 value)
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{
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return static_cast<u16>(u32{value} >> 8 | u32{value} << 8);
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}
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constexpr u32 swap_bytes_32(u32 value)
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{
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return ((value & 0xff000000u) >> 24)
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| ((value & 0x00ff0000u) >> 8)
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| ((value & 0x0000ff00u) << 8)
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| ((value & 0x000000ffu) << 24);
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}
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constexpr u64 swap_bytes_64(u64 value)
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{
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return ((value & 0xff00000000000000ull) >> 56)
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| ((value & 0x00ff000000000000ull) >> 40)
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| ((value & 0x0000ff0000000000ull) >> 24)
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| ((value & 0x000000ff00000000ull) >> 8)
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| ((value & 0x00000000ff000000ull) << 8)
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| ((value & 0x0000000000ff0000ull) << 24)
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| ((value & 0x000000000000ff00ull) << 40)
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| ((value & 0x00000000000000ffull) << 56);
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}
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constexpr u32 swap_halves_32(u32 value)
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{
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return ((value & 0xffff0000u) >> 16)
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| ((value & 0x0000ffffu) << 16);
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}
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constexpr u64 swap_halves_64(u64 value)
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{
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return ((value & 0xffff000000000000ull) >> 48)
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| ((value & 0x0000ffff00000000ull) >> 16)
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| ((value & 0x00000000ffff0000ull) << 16)
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| ((value & 0x000000000000ffffull) << 48);
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}
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constexpr u64 swap_words_64(u64 value)
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{
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return ((value & 0xffffffff00000000ull) >> 32)
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| ((value & 0x00000000ffffffffull) << 32);
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}
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} // namespace mcl::bit
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