util: Add _BitScanForward intrinsic's declaration.

It is missing in some Microsoft DDKs.
2009-06-01 08:58:34 -07:00
parent aa522e6cc4
commit 88b88bba68
1 changed files with 3 additions and 1 deletions
@@ -354,7 +354,9 @@ util_is_pot(unsigned x)
 * Find first bit set in word.  Least significant bit is 1.
 * Return 0 if no bits set.
 */
-#if defined(_MSC_VER) && _MSC_VER >= 1300
+#if defined(_MSC_VER) && _MSC_VER >= 1300 && (_M_IX86 || _M_AMD64 || _M_IA64)
+unsigned char _BitScanForward(unsigned long* Index, unsigned long Mask);
+#pragma intrinsic(_BitScanForward)
 static INLINE
 unsigned long ffs( unsigned long u )
 {