Branch: Tag:

1995-08-09

1995-08-09 10:21:55 by Fredrik Hübinette (Hubbe) <hubbe@hubbe.net>

ulpc dist

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Rev: src/ualarm.c:1.1.1.1

1: + #include "stuff.h"    -  + /* same thing as (int)floor(log((double)x) / log(2.0)) */ + /* Except a bit quicker :) (hopefully) */ +  + int my_log2(unsigned INT32 x) + { +  static char bit[256] = +  { +  -1, 0, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, +  4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, +  5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, +  5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, +  6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, +  6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, +  6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, +  6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, +  7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, +  7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, +  7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, +  7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, +  7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, +  7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, +  7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, +  7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, +  }; +  register unsigned int tmp; +  if(tmp=(x>>16)) +  { +  if(x=(tmp>>8)) return bit[x]+24; +  return bit[tmp]+16; +  } +  if(tmp=(x>>8)) return bit[tmp]+8; +  return bit[x]; + } +  +  + /* Return the number of bits in a 32-bit integer */ + int count_bits(unsigned INT32 x) + { + #define B(X) X+0,X+1,X+1,X+2,\ +  X+1,X+2,X+2,X+3,\ +  X+1,X+2,X+2,X+3,\ +  X+2,X+3,X+3,X+4 +  static char bits[256] = +  { +  B(0), B(1), B(1), B(2), +  B(1), B(2), B(2), B(3), +  B(1), B(2), B(2), B(3), +  B(2), B(3), B(3), B(4) +  }; +  +  return (bits[x & 255] + +  bits[(x>>8) & 255] + +  bits[(x>>16) & 255] + +  bits[(x>>24) & 255]); + } +  + /* Return true for integers with more than one bit set */ + int is_more_than_one_bit(unsigned INT32 x) + { +  return ((x & 0xaaaaaaaa) && (x & 0x55555555)) || +  ((x & 0xcccccccc) && (x & 0x33333333)) || +  ((x & 0xf0f0f0f0) && (x & 0x0f0f0f0f)) || +  ((x & 0xff00ff00) && (x & 0x00ff00ff)) || +  ((x & 0xff00ff00) && (x & 0x00ff00ff)) || +  ((x & 0xffff0000) && (x & 0x0000ffff)); + }   Newline at end of file added.