[PATCH] fls in asm for x86_64

[Stephen Hemminger]

Use single instruction for find largest set bit on x86_64.

Signed-off-by: Stephen Hemminger <shemminger@xxxxxxxx>

--- orig/include/asm-x86_64/bitops.h
+++ new/include/asm-x86_64/bitops.h
@@ -370,6 +370,22 @@ static __inline__ int ffs(int x)
 }
 
 /**
+ * fls - find last bit set
+ * @x: the word to search
+ *
+ * This is defined the same way as ffs.
+ */
+static __inline__ int fls(int x)
+{
+	int r;
+
+	__asm__("bsrl %1,%0\n\t"
+		"cmovzl %2,%0"
+		: "=r" (r) : "rm" (x), "r" (-1));
+	return r+1;
+}
+
+/**
  * hweightN - returns the hamming weight of a N-bit word
  * @x: the word to weigh
  *
@@ -407,9 +423,6 @@ static __inline__ int ffs(int x)
 #define minix_find_first_zero_bit(addr,size) \
 	find_first_zero_bit((void*)addr,size)
 
-/* find last set bit */
-#define fls(x) generic_fls(x)
-
 #endif /* __KERNEL__ */
 
 #endif /* _X86_64_BITOPS_H */
-
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