p256-x86_64.pl: update commentary with before-after performance data.
(Imported from upstream's f0e6871df2e4641d0532e8f99d26c7a6454d03df.)
Change-Id: I2b799ff2a133839b0fe9d9093799d3a86045d709
Reviewed-on: https://boringssl-review.googlesource.com/25584
Reviewed-by: Adam Langley <agl@google.com>
diff --git a/crypto/fipsmodule/ec/asm/p256-x86_64-asm.pl b/crypto/fipsmodule/ec/asm/p256-x86_64-asm.pl
index 7ae2d5e..30cea0b 100755
--- a/crypto/fipsmodule/ec/asm/p256-x86_64-asm.pl
+++ b/crypto/fipsmodule/ec/asm/p256-x86_64-asm.pl
@@ -25,20 +25,24 @@
# Further optimization by <appro@openssl.org>:
#
-# this/original
-# Opteron +12-49%
-# Bulldozer +14-45%
-# P4 +18-46%
-# Westmere +12-34%
-# Sandy Bridge +9-35%
-# Ivy Bridge +9-35%
-# Haswell +8-37%
-# Broadwell +18-58%
-# Atom +15-50%
-# VIA Nano +43-160%
+# this/original with/without -DECP_NISTZ256_ASM(*)
+# Opteron +12-49% +110-150%
+# Bulldozer +14-45% +175-210%
+# P4 +18-46% n/a :-(
+# Westmere +12-34% +80-87%
+# Sandy Bridge +9-35% +110-120%
+# Ivy Bridge +9-35% +110-125%
+# Haswell +8-37% +140-160%
+# Broadwell +18-58% +145-210%
+# Atom +15-50% +130-180%
+# VIA Nano +43-160% +300-480%
+#
+# (*) "without -DECP_NISTZ256_ASM" refers to build with
+# "enable-ec_nistp_64_gcc_128";
#
# Ranges denote minimum and maximum improvement coefficients depending
-# on benchmark.
+# on benchmark. Lower coefficients are for ECDSA sign, relatively fastest
+# server-side operation. Keep in mind that +100% means 2x improvement.
$flavour = shift;
$output = shift;
