vlib: add vlib_frame_bitmap_is_bit_set

Type: improvement
Change-Id: I2f3fab893a10b060f91b07ee17b8727d241830ea
Signed-off-by: Damjan Marion <dmarion@me.com>

diff --git a/src/vlib/node_funcs.h b/src/vlib/node_funcs.h
index 8672270..45a36fe 100644 (file)
--- a/src/vlib/node_funcs.h
+++ b/src/vlib/node_funcs.h
@@ -1443,6 +1443,14 @@ vlib_frame_bitmap_count_set_bits (uword *bmp)
   return count;
 }
 
+static_always_inline uword
+vlib_frame_bitmap_is_bit_set (uword *bmp, uword bit_index)
+{
+  bmp += bit_index / uword_bits;
+  bit_index %= uword_bits;
+  return (bmp[0] >> bit_index) & 1;
+}
+
 static_always_inline int
 vlib_frame_bitmap_find_first_set (uword *bmp)
 {