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Diffstat (limited to 'src/shared/macro.h')
| -rw-r--r-- | src/shared/macro.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/src/shared/macro.h b/src/shared/macro.h index 11bd8b3a93..179b24c983 100644 --- a/src/shared/macro.h +++ b/src/shared/macro.h @@ -140,6 +140,15 @@ static inline unsigned long ALIGN_POWER2(unsigned long u) { _a > _b ? _a : _b; \ }) +/* 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); \ |