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-rw-r--r--src/vppinfra/bitops.h8
1 files changed, 8 insertions, 0 deletions
diff --git a/src/vppinfra/bitops.h b/src/vppinfra/bitops.h
index ab91b8ae443..17ad49ffb46 100644
--- a/src/vppinfra/bitops.h
+++ b/src/vppinfra/bitops.h
@@ -44,6 +44,13 @@
always_inline uword
count_set_bits (uword x)
{
+#ifdef __POPCNT__
+#if uword_bits == 64
+ return __builtin_popcountll (x);
+#else
+ return __builtin_popcount (x);
+#endif
+#else
#if uword_bits == 64
const uword c1 = 0x5555555555555555;
const uword c2 = 0x3333333333333333;
@@ -71,6 +78,7 @@ count_set_bits (uword x)
#endif
return x & (2 * BITS (uword) - 1);
+#endif
}
/* Based on "Hacker's Delight" code from GLS. */