runtime/src/sun/vm/fixed.c

   1 #include "fixed.h"
   2
   3 #include <math.h>
   4
   5 Fixed fixedSqrt(Fixed value) {
   6         float f = FIXED_TO_FLOAT(value);
   7         float f2 = sqrtf(f);
   8         return FIXED_FROM_FLOAT(f2);
   9
  10
  11 #if 0
  12         Fixed root;
  13
  14         register unsigned long remHi, remLo, testDiv, count;
  15
  16         root.raw = 0;/* Clear root */
  17         remHi = 0;/* Clear high part of partial remainder */
  18         remLo = value.raw;/* Get argument into low part of partial remainder */
  19         count = FIXED_FRACTIONAL_BITS;/* Load loop counter */
  20
  21         do {
  22                 remHi = (remHi << FIXED_INTEGRAL_BITS) | (remLo >> FIXED_FRACTIONAL_BITS);
  23                 remLo <<= 2;  /* get 2 bits of arg */
  24                 root.raw <<= 1; /* Get ready for the next bit in the root */
  25                 testDiv = (root.raw << 1) + 1;/* Test radical */
  26
  27                 if (remHi >= testDiv) {
  28                         remHi -= testDiv;
  29                         root.raw++;
  30                 }
  31         } while (count-- != 0);
  32
  33         return(root);
  34 #endif
  35 }
  36
  37 Fixed fixedSin(Fixed value) {
  38         float f = FIXED_TO_FLOAT(value);
  39         float f2 = sinf(f * M_PI * 2.0f);
  40         return FIXED_FROM_FLOAT(f2);
  41 }
  42
  43 Fixed fixedCos(Fixed value) {
  44         float f = FIXED_TO_FLOAT(value);
  45         float f2 = cosf(f * M_PI * 2.0f);
  46         return FIXED_FROM_FLOAT(f2);
  47 }
  48
  49 Fixed fixedAtan2(Fixed x, Fixed y) {
  50         float f1 = FIXED_TO_FLOAT(y); // Notice swap
  51         float f2 = FIXED_TO_FLOAT(x);
  52         float f3 = atan2f(f1, f2);
  53         float f4 = f3 / (M_PI * 2.0f);
  54         return FIXED_FROM_FLOAT(f4);
  55 }
  56
  57 Fixed fixedAbs(Fixed value) {
  58         float f = FIXED_TO_FLOAT(value);
  59         float f2 = fabsf(f);
  60         return FIXED_FROM_FLOAT(f2);
  61 }
  62
  63 Fixed fixedCeil(Fixed value) {
  64         float f = FIXED_TO_FLOAT(value);
  65         float f2 = ceilf(f);
  66         return FIXED_FROM_FLOAT(f2);
  67 }
  68
  69 Fixed fixedFloor(Fixed value) {
  70         float f = FIXED_TO_FLOAT(value);
  71         float f2 = floorf(f);
  72         return FIXED_FROM_FLOAT(f2);
  73 }