From: Andy Polyakov <appro@openssl.org>
Date: Mon, 27 Jun 2011 09:46:16 +0000 (+0000)
Subject: rc4-x86_64.pl: commentary update.
X-Git-Tag: OpenSSL-fips-2_0-rc1~288
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=0772f3b4f6a47aaa53e6cc2afdb0ec880d693c89;p=openssl

rc4-x86_64.pl: commentary update.
---

diff --git a/crypto/rc4/asm/rc4-x86_64.pl b/crypto/rc4/asm/rc4-x86_64.pl
index 9c2daf40aa..e18e8a0008 100755
--- a/crypto/rc4/asm/rc4-x86_64.pl
+++ b/crypto/rc4/asm/rc4-x86_64.pl
@@ -86,14 +86,17 @@
 # is better) and improvement coefficients relative to previous
 # version of this module are:
 #
-# Opteron	5.3/+0%
+# Opteron	5.3/+0%(*)
 # P4		6.5
-# Core2		6.2/+15%(*)
+# Core2		6.2/+15%(**)
 # Westmere	4.2/+60%
 # Sandy Bridge	4.2/+120%
 # Atom		9.3/+80%
 #
-# (*)	Note that Core2 result is ~15% lower than corresponding result
+# (*)	But corresponding loop has less instructions, which should have
+#	positive effect on upcoming Bulldozer, which has one less ALU.
+#	For reference, Intel code runs at 6.8 cpb rate on Opteron.
+# (**)	Note that Core2 result is ~15% lower than corresponding result
 #	for 32-bit code, meaning that it's possible to improve it,
 #	but more than likely at the cost of the others (see rc4-586.pl
 #	to get the idea)...