This file is indexed.

/usr/include/allegro/inline/fmaths.inl is in liballegro4-dev 2:4.4.2-4.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
/*         ______   ___    ___
 *        /\  _  \ /\_ \  /\_ \
 *        \ \ \L\ \\//\ \ \//\ \      __     __   _ __   ___
 *         \ \  __ \ \ \ \  \ \ \   /'__`\ /'_ `\/\`'__\/ __`\
 *          \ \ \/\ \ \_\ \_ \_\ \_/\  __//\ \L\ \ \ \//\ \L\ \
 *           \ \_\ \_\/\____\/\____\ \____\ \____ \ \_\\ \____/
 *            \/_/\/_/\/____/\/____/\/____/\/___L\ \/_/ \/___/
 *                                           /\____/
 *                                           \_/__/
 *
 *      Fixed point math inline functions (generic C).
 *
 *      By Shawn Hargreaves.
 *
 *      See readme.txt for copyright information.
 */


#ifndef ALLEGRO_FMATHS_INL
#define ALLEGRO_FMATHS_INL

#define ALLEGRO_IMPORT_MATH_ASM
#include "asm.inl"
#undef ALLEGRO_IMPORT_MATH_ASM

#ifdef __cplusplus
   extern "C" {
#endif


/* ftofix and fixtof are used in generic C versions of fixmul and fixdiv */
AL_INLINE(fixed, ftofix, (double x),
{
   if (x > 32767.0) {
      *allegro_errno = ERANGE;
      return 0x7FFFFFFF;
   }

   if (x < -32767.0) {
      *allegro_errno = ERANGE;
      return -0x7FFFFFFF;
   }

   return (fixed)(x * 65536.0 + (x < 0 ? -0.5 : 0.5));
})


AL_INLINE(double, fixtof, (fixed x),
{
   return (double)x / 65536.0;
})


#ifdef ALLEGRO_NO_ASM

/* use generic C versions */

AL_INLINE(fixed, fixadd, (fixed x, fixed y),
{
   fixed result = x + y;

   if (result >= 0) {
      if ((x < 0) && (y < 0)) {
         *allegro_errno = ERANGE;
         return -0x7FFFFFFF;
      }
      else
         return result;
   }
   else {
      if ((x > 0) && (y > 0)) {
         *allegro_errno = ERANGE;
         return 0x7FFFFFFF;
      }
      else
         return result;
   }
})


AL_INLINE(fixed, fixsub, (fixed x, fixed y),
{
   fixed result = x - y;

   if (result >= 0) {
      if ((x < 0) && (y > 0)) {
         *allegro_errno = ERANGE;
         return -0x7FFFFFFF;
      }
      else
         return result;
   }
   else {
      if ((x > 0) && (y < 0)) {
         *allegro_errno = ERANGE;
         return 0x7FFFFFFF;
      }
      else
         return result;
   }
})


/* In benchmarks conducted circa May 2005 we found that, in the main:
 * - IA32 machines performed faster with one implementation;
 * - AMD64 and G4 machines performed faster with another implementation.
 *
 * Benchmarks were mainly done with differing versions of gcc.
 * Results varied with other compilers, optimisation levels, etc.
 * so this is not optimal, though a tenable compromise.
 *
 * Note that the following implementation are NOT what were benchmarked.
 * We had forgotten to put in overflow detection in those versions.
 * If you don't need overflow detection then previous versions in the
 * CVS tree might be worth looking at.
 *
 * PS. Don't move the #ifs inside the AL_INLINE; BCC doesn't like it.
 */
#if (defined ALLEGRO_I386) || (!defined LONG_LONG)
   AL_INLINE(fixed, fixmul, (fixed x, fixed y),
   {
      return ftofix(fixtof(x) * fixtof(y));
   })
#else
   AL_INLINE(fixed, fixmul, (fixed x, fixed y),
   {
      LONG_LONG lx = x;
      LONG_LONG ly = y;
      LONG_LONG lres = (lx*ly);

      if (lres > 0x7FFFFFFF0000LL) {
	 *allegro_errno = ERANGE;
	 return 0x7FFFFFFF;
      }
      else if (lres < -0x7FFFFFFF0000LL) {
	 *allegro_errno = ERANGE;
	 return 0x80000000;
      }
      else {
	 int res = lres >> 16;
	 return res;
      }
   })
#endif	    /* fixmul() C implementations */


AL_INLINE(fixed, fixdiv, (fixed x, fixed y),
{
   if (y == 0) {
      *allegro_errno = ERANGE;
      return (x < 0) ? -0x7FFFFFFF : 0x7FFFFFFF;
   }
   else
      return ftofix(fixtof(x) / fixtof(y));
})


AL_INLINE(int, fixfloor, (fixed x),
{
   /* (x >> 16) is not portable */
   if (x >= 0)
      return (x >> 16);
   else
      return ~((~x) >> 16);
})


AL_INLINE(int, fixceil, (fixed x),
{
   if (x > 0x7FFF0000) {
      *allegro_errno = ERANGE;
      return 0x7FFF;
   }

   return fixfloor(x + 0xFFFF);
})

#endif      /* C vs. inline asm */


AL_INLINE(fixed, itofix, (int x),
{
   return x << 16;
})


AL_INLINE(int, fixtoi, (fixed x),
{
   return fixfloor(x) + ((x & 0x8000) >> 15);
})


AL_INLINE(fixed, fixcos, (fixed x),
{
   return _cos_tbl[((x + 0x4000) >> 15) & 0x1FF];
})


AL_INLINE(fixed, fixsin, (fixed x),
{
   return _cos_tbl[((x - 0x400000 + 0x4000) >> 15) & 0x1FF];
})


AL_INLINE(fixed, fixtan, (fixed x),
{
   return _tan_tbl[((x + 0x4000) >> 15) & 0xFF];
})


AL_INLINE(fixed, fixacos, (fixed x),
{
   if ((x < -65536) || (x > 65536)) {
      *allegro_errno = EDOM;
      return 0;
   }

   return _acos_tbl[(x+65536+127)>>8];
})


AL_INLINE(fixed, fixasin, (fixed x),
{
   if ((x < -65536) || (x > 65536)) {
      *allegro_errno = EDOM;
      return 0;
   }

   return 0x00400000 - _acos_tbl[(x+65536+127)>>8];
})

#ifdef __cplusplus
   }
#endif

#endif          /* ifndef ALLEGRO_FMATHS_INL */