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Diffstat (limited to 'src/shared/macro.h')
| -rw-r--r-- | src/shared/macro.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/src/shared/macro.h b/src/shared/macro.h index 548294e47b..6a57428244 100644 --- a/src/shared/macro.h +++ b/src/shared/macro.h @@ -197,6 +197,17 @@ static inline unsigned long ALIGN_POWER2(unsigned long u) { UNIQ_T(X,xq); \ }) +/* [(x + y - 1) / y] suffers from an integer overflow, even though the + * computation should be possible in the given type. Therefore, we use + * [x / y + !!(x % y)]. Note that on "Real CPUs" a division returns both the + * quotient and the remainder, so both should be equally fast. */ +#define DIV_ROUND_UP(_x, _y) \ + __extension__ ({ \ + const typeof(_x) __x = (_x); \ + const typeof(_y) __y = (_y); \ + (__x / __y + !!(__x % __y)); \ + }) + #define assert_se(expr) \ do { \ if (_unlikely_(!(expr))) \ |