X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=lib%2Fhweight.c;h=389424ecb129f13760de1677bd297b392264c953;hb=42cc77c861e8e850e86252bb5b1e12e006261973;hp=4382576717086eeaaa48d928db67dfb6757cbbb7;hpb=f9b4192923fa6e38331e88214b1fe5fc21583fcc;p=safe%2Fjmp%2Flinux-2.6

diff --git a/lib/hweight.c b/lib/hweight.c
index 4382576..389424e 100644
--- a/lib/hweight.c
+++ b/lib/hweight.c
@@ -1,4 +1,5 @@
 #include <linux/module.h>
+#include <linux/bitops.h>
 #include <asm/types.h>
 
 /**
@@ -40,14 +41,19 @@ unsigned long hweight64(__u64 w)
 #if BITS_PER_LONG == 32
 	return hweight32((unsigned int)(w >> 32)) + hweight32((unsigned int)w);
 #elif BITS_PER_LONG == 64
+#ifdef ARCH_HAS_FAST_MULTIPLIER
+	w -= (w >> 1) & 0x5555555555555555ul;
+	w =  (w & 0x3333333333333333ul) + ((w >> 2) & 0x3333333333333333ul);
+	w =  (w + (w >> 4)) & 0x0f0f0f0f0f0f0f0ful;
+	return (w * 0x0101010101010101ul) >> 56;
+#else
 	__u64 res = w - ((w >> 1) & 0x5555555555555555ul);
 	res = (res & 0x3333333333333333ul) + ((res >> 2) & 0x3333333333333333ul);
 	res = (res + (res >> 4)) & 0x0F0F0F0F0F0F0F0Ful;
 	res = res + (res >> 8);
 	res = res + (res >> 16);
 	return (res + (res >> 32)) & 0x00000000000000FFul;
-#else
-#error BITS_PER_LONG not defined
+#endif
 #endif
 }
 EXPORT_SYMBOL(hweight64);