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-rw-r--r--vppinfra/vppinfra/bitmap.h20
1 files changed, 20 insertions, 0 deletions
diff --git a/vppinfra/vppinfra/bitmap.h b/vppinfra/vppinfra/bitmap.h
index e69851b60be..986c322e86c 100644
--- a/vppinfra/vppinfra/bitmap.h
+++ b/vppinfra/vppinfra/bitmap.h
@@ -338,6 +338,26 @@ always_inline uword clib_bitmap_first_set (uword * ai)
return ~0;
}
+/* Return highest numbered set bit in bitmap.
+
+ Return infinity (~0) if bitmap is zero. */
+always_inline uword clib_bitmap_last_set (uword * ai)
+{
+ uword i;
+
+ for (i = vec_len (ai) - 1; i >= 0 ; i--)
+ {
+ uword x = ai[i];
+ if (x != 0)
+ {
+ uword first_bit;
+ count_leading_zeros (first_bit, x);
+ return (i + 1) * BITS (ai[0]) - first_bit - 1;
+ }
+ }
+ return ~0;
+}
+
/* Return lowest numbered clear bit in bitmap. */
always_inline uword
clib_bitmap_first_clear (uword * ai)