Extended the bitfield operations and their Python bindings.

1 files changed, 50 insertions, 0 deletions

diff --git a/src/common/bits.c b/src/common/bits.c
index 5533293..cdcef85 100644
--- a/src/common/bits.c
+++ b/src/common/bits.c
@@ -30,6 +30,9 @@
 #include <string.h>
 
 
+#include "asm.h"
+
+
 
 /* Champ de bits simple */
 struct _bitfield_t
@@ -549,3 +552,50 @@ bool test_all_in_bit_field(const bitfield_t *field, size_t first, size_t count)
     return result;
 
 }
+
+
+/******************************************************************************
+*                                                                             *
+*  Paramètres  : field = champ de bits à consulter.                           *
+*                                                                             *
+*  Description : Détermine le nombre de bits à 1 dans un champ.               *
+*                                                                             *
+*  Retour      : Valeur positive ou nulle.                                    *
+*                                                                             *
+*  Remarques   : -                                                            *
+*                                                                             *
+******************************************************************************/
+
+size_t popcount_for_bit_field(const bitfield_t *field)
+{
+    size_t result;                          /* Quantité à renvoyer         */
+    size_t remaining;                       /* Nombre de bits restants     */
+    size_t i;                               /* Boucle de parcours          */
+    unsigned long value;                    /* Valeur masquée à traiter    */
+
+    result = 0;
+
+    remaining = field->length;
+
+    for (i = 0; i < field->requested; i++)
+    {
+        value = field->bits[i];
+
+        if (remaining < (8 * sizeof(unsigned long)))
+            value &= 1 << (remaining - 1);
+
+#if __WORDSIZE == 64
+        result += popcount_64(value);
+#elif __WORDSIZE == 32
+        result += popcount_32(value);
+#else
+#   error "Unkown word size"
+#endif
+
+        remaining -= 8 * sizeof(unsigned long);
+
+    }
+
+    return result;
+
+}