Refactored the msb implementation.

1 files changed, 14 insertions, 6 deletions

diff --git a/src/common/asm.c b/src/common/asm.c
index f29d599..692256f 100644
--- a/src/common/asm.c
+++ b/src/common/asm.c
@@ -25,6 +25,18 @@
 
 
 
+/**
+ * Indice du bit de poids fort dans un quartet.
+ */
+
+static const unsigned int _bval[16] = {
+
+    0, 1, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4
+
+};
+
+
+
 /******************************************************************************
 *                                                                             *
 *  Paramètres  : v = valeur quelconque sur 32 bits.                           *
@@ -40,8 +52,6 @@
 
 bool msb_32(uint32_t v, unsigned int *p)
 {
-    static const unsigned int bval[] = { 0, 1, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4 };
-
     /* S'il n'y a aucun bit à 1... */
     if (v == 0) return false;
 
@@ -60,7 +70,7 @@ bool msb_32(uint32_t v, unsigned int *p)
     if (v & 0x0000ff00) { *p += 16 / 2; v >>= 16 / 2; }
     if (v & 0x000000f0) { *p += 16 / 4; v >>= 16 / 4; }
 
-    *p += bval[v];
+    *p += _bval[v];
 
     return true;
 
@@ -82,8 +92,6 @@ bool msb_32(uint32_t v, unsigned int *p)
 
 bool msb_64(uint64_t v, unsigned int *p)
 {
-    static const unsigned int bval[] = { 0, 1, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4 };
-
     /* S'il n'y a aucun bit à 1... */
     if (v == 0) return false;
 
@@ -98,7 +106,7 @@ bool msb_64(uint64_t v, unsigned int *p)
     if (v & 0x000000000000ff00ull) { *p += 32 / 4; v >>= 32 / 4; }
     if (v & 0x00000000000000f0ull) { *p += 32 / 8; v >>= 32 / 8; }
 
-    *p += bval[v];
+    *p += _bval[v];
 
     return true;