X-Git-Url: http://pileus.org/git/?a=blobdiff_plain;f=lib%2Fhweight.c;h=63ee4eb1228d13ff4b712cb8f1dd8385bf9c1bcb;hb=e8aec068ecb1957630816cfa2c150c6b3ddd1790;hp=389424ecb129f13760de1677bd297b392264c953;hpb=95b00786f3b8fa99f53931361beeb4c10504ad87;p=~andy%2Flinux

diff --git a/lib/hweight.c b/lib/hweight.c
index 389424ecb12..63ee4eb1228 100644
--- a/lib/hweight.c
+++ b/lib/hweight.c
@@ -11,11 +11,18 @@
 
 unsigned int hweight32(unsigned int w)
 {
+#ifdef ARCH_HAS_FAST_MULTIPLIER
+	w -= (w >> 1) & 0x55555555;
+	w =  (w & 0x33333333) + ((w >> 2) & 0x33333333);
+	w =  (w + (w >> 4)) & 0x0f0f0f0f;
+	return (w * 0x01010101) >> 24;
+#else
 	unsigned int res = w - ((w >> 1) & 0x55555555);
 	res = (res & 0x33333333) + ((res >> 2) & 0x33333333);
 	res = (res + (res >> 4)) & 0x0F0F0F0F;
 	res = res + (res >> 8);
 	return (res + (res >> 16)) & 0x000000FF;
+#endif
 }
 EXPORT_SYMBOL(hweight32);