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/* rearran.c£ºÎ»ºÍ×Ö½ÚµÄÖØÅÅ */
/* λ·´×ª£ºÒÔ×ÖµÄÖÐÐÄΪ¶Ô³Æµã½øÐÐλ·´Éä
ÀýÈ磺 abcd efgh ijkl mnop ABCD EFGH IJKL MNOP
λ·´×ª£ºPONM LKJI HGFE DCBA ponm lkji hgfe dcba */
unsigned rev(unsigned x){
/* ½»»»ÏàÁڵĵ¥¸öλ */
x=(x & 0x55555555)<<1 | (x & 0xaaaaaaaa)>>1;
/* ½»»»ÏàÁÚµÄ2λ×Ö¶Î */
x=(x & 0x33333333)<<2 | (x & 0xcccccccc)>>2;
/* ½»»»ÏàÁÚµÄ4λ×Ö¶Î */
x=(x & 0x0f0f0f0f)<<4 | (x & 0xf0f0f0f0)>>4;
/* ½»»»ÏàÁÚµÄ8λ×Ö¶Î */
x=(x & 0x00ff00ff)<<8 | (x & 0xff00ff00)>>8;
/* ½»»»ÏàÁÚµÄ16λ×Ö¶Î */
x=(x & 0x0000ffff)<<16 | (x & 0xffff0000)>>16;
return x;
}
/* ×Ö½Ú·´×ª£ºÒÔ×ÖµÄÖÐÐÄΪ¶Ô³Æµã½øÐÐ×Ö½Ú·´Éä
ÀýÈ磺 abcd efgh ijkl mnop ABCD EFGH IJKL MNOP
×Ö½Ú·´×ª£ºIJKL MNOP ABCD EFGH ijkl mnop abcd efgh */
unsigned revw(unsigned x){
x=(x & 0x00ff00ff)<<8 | (x & 0xff00ff00)>>8;
x=(x & 0x0000ffff)<<16 | (x & 0xffff0000)>>16;
return x;
}
/* λ»ìÏ´£º½«ÓÒ°ë×ֵĸ÷¸öλÏà¼äµØ²åÈëµ½×ó°ë×ÖÖУ¬Î²²¿µÄλÈÔÈ»±£ÁôÔÚβ²¿
ÀýÈ磺abcd efgh ijkl mnop ABCD EFGH IJKL MNOP
»ìÏ´£ºaAbB cCdD eEfF gGhH iIjJ kKlL mMnN oOpP */
unsigned shuffling(unsigned x){
unsigned t;
/* ³õʼ£ºabcd efgh ijkl mnop ABCD EFGH IJKL MNOP */
/* abcd efgh ABCD EFGH ijkl mnop IJKL MNOP */
t=(x ^ (x>>8)) & 0x0000ff00; x=x ^ t ^ (t<<8);
/* abcd ABCD efgh EFGH ijkl IJKL mnop MNOP */
t=(x ^ (x>>4)) & 0x00f000f0; x=x ^ t ^ (t<<4);
/* abAB cdCD efEf ghGH ijIJ klKL mnMN opOP */
t=(x ^ (x>>2)) & 0x0c0c0c0c; x=x ^ t ^ (t<<2);
/* aAbB cCdD eEfF gGhH iIjJ kKlL mMnN oOpP */
t=(x ^ (x>>1)) & 0x22222222; x=x ^ t ^ (t<<1);
return x;
}
/* Äæ»ìÏ´ */
unsigned unshuffling(unsigned x){
/* ÒÔÏà·´µÄ˳Ðò½øÐн»»»¼´¿ÉʵÏÖÄæ»ìÏ´ */
t=(x ^ (x>>1)) & 0x22222222; x=x ^ t ^ (t<&


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