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)
62