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-rw-r--r--util.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/util.h b/util.h
index 2e7699c..6402f41 100644
--- a/util.h
+++ b/util.h
@@ -25,6 +25,7 @@ void debug(const char *format, ...);
#endif
#define DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d))
+#define ROUND_DOWN(x, y) ((x) & ~((y) - 1))
#define SWAP(a, b) \
do { \