target-ppc/mfrom_table_gen.c

   1 #define _GNU_SOURCE
   2 #include <stdint.h>
   3 #include <stdio.h>
   4 #include <math.h>
   5
   6 int main (void)
   7 {
   8     double d;
   9     uint8_t n;
  10     int i;
  11
  12     printf("static const uint8_t mfrom_ROM_table[602] =\n{\n    ");
  13     for (i = 0; i < 602; i++) {
  14         /* Extremly decomposed:
  15          *                    -T0 / 256
  16          * T0 = 256 * log10(10          + 1.0) + 0.5
  17          */
  18         d = -i;
  19         d /= 256.0;
  20         d = exp10(d);
  21         d += 1.0;
  22         d = log10(d);
  23         d *= 256;
  24         d += 0.5;
  25         n = d;
  26         printf("%3d, ", n);
  27         if ((i & 7) == 7)
  28             printf("\n    ");
  29     }
  30     printf("\n};\n");
  31
  32     return 0;
  33 }