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Annotation of nono/lib/bitrev.h, revision 1.1

1.1     ! root        1: //
        !             2: // nono
        !             3: // Copyright (C) 2020 nono project
        !             4: // Licensed under nono-license.txt
        !             5: //
        !             6: 
        !             7: #pragma once
        !             8: 
        !             9: #include "header.h"
        !            10: 
        !            11: extern const uint8 bitrev_table[256];
        !            12: 
        !            13: // 8ビットを左右反転する (定数用)
        !            14: static constexpr uint8 _rev8(uint8 x)
        !            15: {
        !            16:        x = ((x & 0x0f) << 4) | ((x >> 4) & 0x0f);
        !            17:        x = ((x & 0x33) << 2) | ((x >> 2) & 0x33);
        !            18:        x = ((x & 0x55) << 1) | ((x >> 1) & 0x55);
        !            19:        return x;
        !            20: }
        !            21: 
        !            22: // 8ビットを左右反転する (実行時用)
        !            23: static inline uint8
        !            24: bitrev(uint8 x)
        !            25: {
        !            26:        return bitrev_table[x];
        !            27: }

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