Changeset d354d57 in mainline

Timestamp:

2010-05-22T22:24:15Z (14 years ago)

Author:

Martin Decky <martin@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

d92bf462

Parents:

b8230b9

Message:

use fnzb32 or fnzb64 according to the platform

File:

• kernel/generic/include/bitops.h (modified) (4 diffs)

kernel/generic/include/bitops.h

@@ -27 +27 @@
  */
 
-/** @addtogroup generic 
+/** @addtogroup generic
  * @{
  */
@@ -36 +36 @@
 #define KERN_BITOPS_H_
 
+#ifdef __32_BITS__
+        #define fnzb(arg)  fnzb32(arg)
+#endif
 
-/** Return position of first non-zero bit from left (i.e. [log_2(arg)]).
+#ifdef __64_BITS__
+        #define fnzb(arg)  fnzb64(arg)
+#endif
+
+/** Return position of first non-zero bit from left (32b variant).
  *
- * If number is zero, it returns 0
+ * @return 0 (if the number is zero) or [log_2(arg)].
+ *
  */
-static inline int fnzb32(uint32_t arg)
+static inline uint8_t fnzb32(uint32_t arg)
 {
-        int n = 0;
-
+        uint8_t n = 0;
+        
         if (arg >> 16) {
                 arg >>= 16;
@@ -71 +79 @@
 }
 
-static inline int fnzb64(uint64_t arg)
+/** Return position of first non-zero bit from left (64b variant).
+ *
+ * @return 0 (if the number is zero) or [log_2(arg)].
+ *
+ */
+static inline uint8_t fnzb64(uint64_t arg)
 {
-        int n = 0;
-
+        uint8_t n = 0;
+        
         if (arg >> 32) {
                 arg >>= 32;
@@ -83 +96 @@
 }
 
-#define fnzb(x) fnzb32(x)
-
 #endif