---
src/util/bitscan.h | 25 +++++++++++++++++++++++++
1 file changed, 25 insertions(+)
diff --git a/src/util/bitscan.h b/src/util/bitscan.h
index dc89ac9..cdfecaf 100644
--- a/src/util/bitscan.h
+++ b/src/util/bitscan.h
@@ -112,6 +112,31 @@ u_bit_scan64(uint64_t *mask)
return i;
}
+/* Count bits set in mask */
+static inline int
+u_count_bits(unsigned *mask)
+{
+ unsigned v = *mask;
+ int c;
+ v = v - ((v >> 1) & 0x55555555);
+ v = (v & 0x33333333) + ((v >> 2) & 0x33333333);
+ v = (v + (v >> 4)) & 0xF0F0F0F;
+ c = (int)((v * 0x1010101) >> 24);
+ return c;
+}
+
+static inline int
+u_count_bits64(uint64_t *mask)
+{
+ uint64_t v = *mask;
+ int c;
+ v = v - ((v >> 1) & 0x5555555555555555ull);
+ v = (v & 0x3333333333333333ull) + ((v >> 2) & 0x3333333333333333ull);
+ v = (v + (v >> 4)) & 0xF0F0F0F0F0F0F0Full;
+ c = (int)((v * 0x101010101010101ull) >> 56);
+ return c;
+}
+
/* Determine if an unsigned value is a power of two.
*
* \note
--
2.7.4
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