libhsail-rt/rt/sat_arithmetic.c

   1 /* sat_arithmetic.c -- Builtins for HSAIL saturating arithmetic instructions.
   2
   3    Copyright (C) 2015-2018 Free Software Foundation, Inc.
   4    Contributed by Pekka Jaaskelainen <pekka.jaaskelainen@parmance.com>
   5    for General Processor Tech.
   6
   7    Permission is hereby granted, free of charge, to any person obtaining a
   8    copy of this software and associated documentation files
   9    (the "Software"), to deal in the Software without restriction, including
  10    without limitation the rights to use, copy, modify, merge, publish,
  11    distribute, sublicense, and/or sell copies of the Software, and to
  12    permit persons to whom the Software is furnished to do so, subject to
  13    the following conditions:
  14
  15    The above copyright notice and this permission notice shall be included
  16    in all copies or substantial portions of the Software.
  17
  18    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19    OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  21    IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
  22    DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  23    OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  24    USE OR OTHER DEALINGS IN THE SOFTWARE.
  25 */
  26
  27 #include <stdint.h>
  28
  29 uint8_t
  30 __hsail_sat_add_u8 (uint8_t a, uint8_t b)
  31 {
  32   uint16_t c = (uint16_t) a + (uint16_t) b;
  33   if (c > UINT8_MAX)
  34     return UINT8_MAX;
  35   else
  36     return c;
  37 }
  38
  39 uint16_t
  40 __hsail_sat_add_u16 (uint16_t a, uint16_t b)
  41 {
  42   uint32_t c = (uint32_t) a + (uint32_t) b;
  43   if (c > UINT16_MAX)
  44     return UINT16_MAX;
  45   else
  46     return c;
  47 }
  48
  49 uint32_t
  50 __hsail_sat_add_u32 (uint32_t a, uint32_t b)
  51 {
  52   uint32_t c;
  53   if (__builtin_add_overflow (a, b, &c))
  54     return UINT32_MAX;
  55   return c;
  56 }
  57
  58 uint64_t
  59 __hsail_sat_add_u64 (uint64_t a, uint64_t b)
  60 {
  61   uint64_t c;
  62   if (__builtin_add_overflow (a, b, &c))
  63     return UINT64_MAX;
  64   return c;
  65 }
  66
  67 int8_t
  68 __hsail_sat_add_s8 (int8_t a, int8_t b)
  69 {
  70   int16_t c = (int16_t) a + (int16_t) b;
  71   if (c > INT8_MAX)
  72     return INT8_MAX;
  73   else if (c < INT8_MIN)
  74     return INT8_MIN;
  75   else
  76     return c;
  77 }
  78
  79 int16_t
  80 __hsail_sat_add_s16 (int16_t a, int16_t b)
  81 {
  82   int32_t c = (int32_t) a + (int32_t) b;
  83   if (c > INT16_MAX)
  84     return INT16_MAX;
  85   else if (c < INT16_MIN)
  86     return INT16_MIN;
  87   else
  88     return c;
  89 }
  90
  91 int32_t
  92 __hsail_sat_add_s32 (int32_t a, int32_t b)
  93 {
  94   int32_t c;
  95   if (__builtin_add_overflow (a, b, &c))
  96     return b < 0 ? INT32_MIN : INT32_MAX;
  97   return c;
  98 }
  99
 100 int64_t
 101 __hsail_sat_add_s64 (int64_t a, int64_t b)
 102 {
 103   int64_t c;
 104   if (__builtin_add_overflow (a, b, &c))
 105     return b < 0 ? INT64_MIN : INT64_MAX;
 106   return c;
 107 }
 108
 109 uint8_t
 110 __hsail_sat_sub_u8 (uint8_t a, uint8_t b)
 111 {
 112   int16_t c = (uint16_t) a - (uint16_t) b;
 113   if (c < 0)
 114     return 0;
 115   else
 116     return c;
 117 }
 118
 119 uint16_t
 120 __hsail_sat_sub_u16 (uint16_t a, uint16_t b)
 121 {
 122   int32_t c = (uint32_t) a - (uint32_t) b;
 123   if (c < 0)
 124     return 0;
 125   else
 126     return c;
 127 }
 128
 129 uint32_t
 130 __hsail_sat_sub_u32 (uint32_t a, uint32_t b)
 131 {
 132   uint32_t c;
 133   if (__builtin_sub_overflow (a, b, &c))
 134     return 0;
 135   return c;
 136 }
 137
 138 uint64_t
 139 __hsail_sat_sub_u64 (uint64_t a, uint64_t b)
 140 {
 141   uint64_t c;
 142   if (__builtin_sub_overflow (a, b, &c))
 143     return 0;
 144   return c;
 145 }
 146
 147 int8_t
 148 __hsail_sat_sub_s8 (int8_t a, int8_t b)
 149 {
 150   int16_t c = (int16_t) a - (int16_t) b;
 151   if (c > INT8_MAX)
 152     return INT8_MAX;
 153   else if (c < INT8_MIN)
 154     return INT8_MIN;
 155   else
 156     return c;
 157 }
 158
 159 int16_t
 160 __hsail_sat_sub_s16 (int16_t a, int16_t b)
 161 {
 162   int32_t c = (int32_t) a - (int32_t) b;
 163   if (c > INT16_MAX)
 164     return INT16_MAX;
 165   else if (c < INT16_MIN)
 166     return INT16_MIN;
 167   else
 168     return c;
 169 }
 170
 171 int32_t
 172 __hsail_sat_sub_s32 (int32_t a, int32_t b)
 173 {
 174   int32_t c;
 175   if (__builtin_sub_overflow (a, b, &c))
 176     return b < 0 ? INT32_MAX : INT32_MIN;
 177   return c;
 178 }
 179
 180 int64_t
 181 __hsail_sat_sub_s64 (int64_t a, int64_t b)
 182 {
 183   int64_t c;
 184   if (__builtin_sub_overflow (a, b, &c))
 185     return b < 0 ? INT64_MAX : INT64_MIN;
 186   return c;
 187 }
 188
 189 uint8_t
 190 __hsail_sat_mul_u8 (uint8_t a, uint8_t b)
 191 {
 192   uint16_t c = (uint16_t) a * (uint16_t) b;
 193   if (c > UINT8_MAX)
 194     return UINT8_MAX;
 195   else
 196     return c;
 197 }
 198
 199 uint16_t
 200 __hsail_sat_mul_u16 (uint16_t a, uint16_t b)
 201 {
 202   uint32_t c = (uint32_t) a * (uint32_t) b;
 203   if (c > UINT16_MAX)
 204     return UINT16_MAX;
 205   else
 206     return c;
 207 }
 208
 209 uint32_t
 210 __hsail_sat_mul_u32 (uint32_t a, uint32_t b)
 211 {
 212   uint32_t c;
 213   if (__builtin_mul_overflow (a, b, &c))
 214     return UINT32_MAX;
 215   return c;
 216 }
 217
 218 uint64_t
 219 __hsail_sat_mul_u64 (uint64_t a, uint64_t b)
 220 {
 221   uint64_t c;
 222   if (__builtin_mul_overflow (a, b, &c))
 223     return UINT64_MAX;
 224   return c;
 225 }
 226
 227 int8_t
 228 __hsail_sat_mul_s8 (int8_t a, int8_t b)
 229 {
 230   int16_t c = (int16_t) a * (int16_t) b;
 231   if (c > INT8_MAX)
 232     return INT8_MAX;
 233   else if (c < INT8_MIN)
 234     return INT8_MIN;
 235   else
 236     return c;
 237 }
 238
 239 int16_t
 240 __hsail_sat_mul_s16 (int16_t a, int16_t b)
 241 {
 242   int32_t c = (int32_t) a * (int32_t) b;
 243   if (c > INT16_MAX)
 244     return INT16_MAX;
 245   else if (c < INT16_MIN)
 246     return INT16_MIN;
 247   else
 248     return c;
 249 }
 250
 251 int32_t
 252 __hsail_sat_mul_s32 (int32_t a, int32_t b)
 253 {
 254   int32_t c;
 255   if (__builtin_mul_overflow (a, b, &c))
 256     return ((a > 0) ^ (b > 0)) ? INT32_MIN : INT32_MAX;
 257   return c;
 258 }
 259
 260 int64_t
 261 __hsail_sat_mul_s64 (int64_t a, int64_t b)
 262 {
 263   int64_t c;
 264   if (__builtin_mul_overflow (a, b, &c))
 265     return ((a > 0) ^ (b > 0)) ? INT64_MIN : INT64_MAX;
 266   return c;
 267 }