Changeset 2007 for Whitix

Timestamp:

04/02/09 21:12:18 (3 years ago)

Author:

mwhitworth

Message:

Add _BitFindFirstSet and fls functions.

Files:

• Whitix/trunk/include/bitmap.h (modified) (1 diff)

Whitix/trunk/include/bitmap.h

@@ -55 +55 @@
 }
 
+static inline int _BitFindFirstSet(unsigned long word)
+{
+        asm("bsf %1, %0" : "=r"(word) : "rm"(word));
+        return word;
+}
+
+/* Adapted from Linux too. */
+static inline int fls(unsigned long word)
+{
+        if(word == 0)
+                return -1;
+        
+        asm("bsr %1,%0"
+                : "=r" (word)
+                : "rm" (word));
+        return (int) word;
+}
+
 #endif