diff options
Diffstat (limited to 'src/shared/macro.h')
| -rw-r--r-- | src/shared/macro.h | 61 |
1 files changed, 35 insertions, 26 deletions
diff --git a/src/shared/macro.h b/src/shared/macro.h index 5619c32e45..179b24c983 100644 --- a/src/shared/macro.h +++ b/src/shared/macro.h @@ -133,46 +133,55 @@ static inline unsigned long ALIGN_POWER2(unsigned long u) { }) #undef MAX -#define MAX(a,b) \ - __extension__ ({ \ - typeof(a) _a = (a); \ - typeof(b) _b = (b); \ - _a > _b ? _a : _b; \ +#define MAX(a,b) \ + __extension__ ({ \ + const typeof(a) _a = (a); \ + const typeof(b) _b = (b); \ + _a > _b ? _a : _b; \ }) -#define MAX3(x,y,z) \ - __extension__ ({ \ - typeof(x) _c = MAX(x,y); \ - MAX(_c, z); \ +/* evaluates to (void) if _A or _B are not constant or of different types */ +#define CONST_MAX(_A, _B) \ + __extension__ (__builtin_choose_expr( \ + __builtin_constant_p(_A) && \ + __builtin_constant_p(_B) && \ + __builtin_types_compatible_p(typeof(_A), typeof(_B)), \ + ((_A) > (_B)) ? (_A) : (_B), \ + (void)0)) + +#define MAX3(x,y,z) \ + __extension__ ({ \ + const typeof(x) _c = MAX(x,y); \ + MAX(_c, z); \ }) #undef MIN -#define MIN(a,b) \ - __extension__ ({ \ - typeof(a) _a = (a); \ - typeof(b) _b = (b); \ - _a < _b ? _a : _b; \ +#define MIN(a,b) \ + __extension__ ({ \ + const typeof(a) _a = (a); \ + const typeof(b) _b = (b); \ + _a < _b ? _a : _b; \ }) -#define MIN3(x,y,z) \ - __extension__ ({ \ - typeof(x) _c = MIN(x,y); \ - MIN(_c, z); \ +#define MIN3(x,y,z) \ + __extension__ ({ \ + const typeof(x) _c = MIN(x,y); \ + MIN(_c, z); \ }) -#define LESS_BY(A,B) \ - __extension__ ({ \ - typeof(A) _A = (A); \ - typeof(B) _B = (B); \ - _A > _B ? _A - _B : 0; \ +#define LESS_BY(A,B) \ + __extension__ ({ \ + const typeof(A) _A = (A); \ + const typeof(B) _B = (B); \ + _A > _B ? _A - _B : 0; \ }) #ifndef CLAMP #define CLAMP(x, low, high) \ __extension__ ({ \ - typeof(x) _x = (x); \ - typeof(low) _low = (low); \ - typeof(high) _high = (high); \ + const typeof(x) _x = (x); \ + const typeof(low) _low = (low); \ + const typeof(high) _high = (high); \ ((_x > _high) ? _high : ((_x < _low) ? _low : _x)); \ }) #endif |