libclc/generic/lib/integer/sub_sat.cl

   1 #include <clc/clc.h>
   2 #include "../clcmacro.h"
   3
   4 _CLC_OVERLOAD _CLC_DEF char sub_sat(char x, char y) {
   5   short r = x - y;
   6   return convert_char_sat(r);
   7 }
   8
   9 _CLC_OVERLOAD _CLC_DEF uchar sub_sat(uchar x, uchar y) {
  10   short r = x - y;
  11   return convert_uchar_sat(r);
  12 }
  13
  14 _CLC_OVERLOAD _CLC_DEF short sub_sat(short x, short y) {
  15   int r = x - y;
  16   return convert_short_sat(r);
  17 }
  18
  19 _CLC_OVERLOAD _CLC_DEF ushort sub_sat(ushort x, ushort y) {
  20   int r = x - y;
  21   return convert_ushort_sat(r);
  22 }
  23
  24 _CLC_OVERLOAD _CLC_DEF int sub_sat(int x, int y) {
  25   int r;
  26   if (__builtin_ssub_overflow(x, y, &r))
  27     // The oveflow can only occur in the direction of the first operand
  28     return x > 0 ? INT_MAX : INT_MIN;
  29   return r;
  30 }
  31
  32 _CLC_OVERLOAD _CLC_DEF uint sub_sat(uint x, uint y) {
  33   uint r;
  34   if (__builtin_usub_overflow(x, y, &r))
  35         return 0;
  36   return r;
  37 }
  38
  39 _CLC_OVERLOAD _CLC_DEF long sub_sat(long x, long y) {
  40   long r;
  41   if (__builtin_ssubl_overflow(x, y, &r))
  42     // The oveflow can only occur in the direction of the first operand
  43     return x > 0 ? LONG_MAX : LONG_MIN;
  44   return r;
  45 }
  46
  47 _CLC_OVERLOAD _CLC_DEF ulong sub_sat(ulong x, ulong y) {
  48   ulong r;
  49   if (__builtin_usubl_overflow(x, y, &r))
  50         return 0;
  51   return r;
  52 }
  53
  54 _CLC_BINARY_VECTORIZE(_CLC_OVERLOAD _CLC_DEF, char, sub_sat, char, char)
  55 _CLC_BINARY_VECTORIZE(_CLC_OVERLOAD _CLC_DEF, uchar, sub_sat, uchar, uchar)
  56 _CLC_BINARY_VECTORIZE(_CLC_OVERLOAD _CLC_DEF, short, sub_sat, short, short)
  57 _CLC_BINARY_VECTORIZE(_CLC_OVERLOAD _CLC_DEF, ushort, sub_sat, ushort, ushort)
  58 _CLC_BINARY_VECTORIZE(_CLC_OVERLOAD _CLC_DEF, int, sub_sat, int, int)
  59 _CLC_BINARY_VECTORIZE(_CLC_OVERLOAD _CLC_DEF, uint, sub_sat, uint, uint)
  60 _CLC_BINARY_VECTORIZE(_CLC_OVERLOAD _CLC_DEF, long, sub_sat, long, long)
  61 _CLC_BINARY_VECTORIZE(_CLC_OVERLOAD _CLC_DEF, ulong, sub_sat, ulong, ulong)