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Commentary section update.

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This commit is contained in:
Andy Polyakov 2005-07-14 13:16:31 +00:00
parent 0d2848b3ba
commit b4f5e5c959
1 changed files with 14 additions and 5 deletions
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19
crypto/aes/asm/aes-x86_64.pl
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@ -10,12 +10,21 @@
#
# aes-*-cbc benchmarks are improved by 50% [compared to gcc 3.3.2 on
# Opteron 240 CPU] plus all the bells-n-whistles from 32-bit version
# [you'll notice a lot of resemblance], such as compressed S-boxs
# and prefetch of these tables in CBC mode, as well as avoiding L1
# cache aliasing between stack frame and key schedule and already
# mentioned tables.
# [you'll notice a lot of resemblance], such as compressed S-boxes
# in little-endian byte order, prefetch of these tables in CBC mode,
# as well as avoiding L1 cache aliasing between stack frame and key
# schedule and already mentioned tables.
#
# ECB performance is 15.6 cycles per processed byte for 128-bit key.
# Performance in number of cycles per processed byte for 128-bit key:
#
# ECB CBC encrypt
# AMD64 15.6 14.6(*)
# EM64T 23.3(**) 21.4(*)
#
# (*) CBC benchmarks are better than ECB thanks to custom ABI used
# by the private block encryption function.
# (**) This module exhibits virtually same ECB performance as 32-bit
# counterpart on [current] Intel CPU.
$output=shift;
open STDOUT,"| $^X ../perlasm/x86_64-xlate.pl $output";