math.h

   1 #ifndef __MY_MATH_H
   2 #define __MY_MATH_H
   3
   4 #include "cfg.h"
   5
   6 #define PREC 10  /* fixpoint arithmetics precision */
   7
   8
   9 #define PREC2 (1<<PREC)
  10 #define LOW_BITS (PREC2-1)
  11
  12 #define float2double(a) ((int)((a)*PREC2))
  13 #define int2double(a) ((a)<<PREC)
  14 #define double2int(a) ((a)>>PREC)
  15 /* int and (int a,int b) */
  16 #define my_and(a,b) ((a)&((b<<PREC)+LOW_BITS))
  17 #define mul(a,b) ((int)(((long_long)(a)*(b))>>PREC))
  18 /* int add_int (int a,int b) */
  19 #define add_int(a,b) ((a)+((b)<<PREC))
  20 /* int mul_int (int a,int b) */
  21 #define mul_int(a,b) ((int)(((long_long)(a)*((b)<<PREC))>>PREC))
  22 /* int sub_int (int a,int b) */
  23 #define sub_int(a,b) ((a)-((b)<<PREC))
  24 /* int sub_int (int a,int b) */
  25 #define sub_from_int(a,b) (((a)<<PREC)-(b))
  26 #define my_abs(a) ((a)>0?(a):-(a))
  27 #define my_sgn(a) ((a)>0?1:((a)<0?-1:0))
  28 /* int round_up(int a) */
  29 #define round_up(a) (((a)+LOW_BITS)>>PREC)
  30
  31 /* "min" and "max" might already been defined on Win32 */
  32 #ifndef WIN32
  33         #define max(a,b) ((a)>=(b)?(a):(b))
  34         #define min(a,b) ((a)<=(b)?(a):(b))
  35 #else
  36         #define M_PI 3.1415926535897932384626433832795L
  37 #endif
  38
  39 #endif