1 files changed, 36 insertions, 0 deletions
diff --git a/volk/kernels/volk/volk_32u_popcnt.h b/volk/kernels/volk/volk_32u_popcnt.h
new file mode 100644
index 000000000..978356972
--- /dev/null
+++ b/volk/kernels/volk/volk_32u_popcnt.h
@@ -0,0 +1,36 @@
+#ifndef INCLUDED_VOLK_32u_POPCNT_A16_H
+#define INCLUDED_VOLK_32u_POPCNT_A16_H
+
+#include <stdio.h>
+#include <inttypes.h>
+
+
+#ifdef LV_HAVE_GENERIC
+
+static inline void volk_32u_popcnt_generic(uint32_t* ret, const uint32_t value) {
+
+  // This is faster than a lookup table
+  uint32_t retVal = value;
+
+  retVal = (retVal & 0x55555555) + (retVal >> 1 & 0x55555555);
+  retVal = (retVal & 0x33333333) + (retVal >> 2 & 0x33333333);
+  retVal = (retVal + (retVal >> 4)) & 0x0F0F0F0F;
+  retVal = (retVal + (retVal >> 8));
+  retVal = (retVal + (retVal >> 16)) & 0x0000003F;
+
+  *ret = retVal;
+}
+
+#endif /*LV_HAVE_GENERIC*/
+
+#ifdef LV_HAVE_SSE4_2
+
+#include <nmmintrin.h>
+
+static inline void volk_32u_popcnt_a_sse4_2(uint32_t* ret, const uint32_t value) {
+  *ret = _mm_popcnt_u32(value);
+}
+
+#endif /*LV_HAVE_SSE4_2*/
+
+#endif /*INCLUDED_VOLK_32u_POPCNT_A16_H*/