tweak PERL_HASH() to h=h+(h>>5) in order to improve distribution of

low bits (suggested by Ilya Zakharevich)

p4raw-id: //depot/perl@1865

1 files changed, 1 insertions, 1 deletions

diff --git a/hv.h b/hv.h
index 19694ac5d1..466f33d2bb 100644
--- a/hv.h
+++ b/hv.h
@@ -45,7 +45,7 @@ struct xpvhv {
 	register U32 hash_PeRlHaSh = 0; \
 	while (i_PeRlHaSh--) \
 	    hash_PeRlHaSh = hash_PeRlHaSh * 33 + *s_PeRlHaSh++; \
-	(hash) = hash_PeRlHaSh; \
+	(hash) = hash_PeRlHaSh + (hash_PeRlHaSh>>5); \
     } STMT_END