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s390x-gf2m.pl: commentary update (final performance numbers turned to be

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higher).
This commit is contained in:
Andy Polyakov 2011-07-04 11:20:33 +00:00
parent c540aa2fb1
commit 02a73e2bed
1 changed files with 11 additions and 10 deletions
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crypto/bn/asm/s390x-gf2m.pl
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@ -12,17 +12,18 @@
# The module implements bn_GF2m_mul_2x2 polynomial multiplication used
# in bn_gf2m.c. It's kind of low-hanging mechanical port from C for
# the time being... gcc 4.3 appeared to generate poor code, therefore
# the effort. The module delivers 55%-90% improvement on haviest ECDSA
# verify and ECDH benchmarks for 163- and 571-bit keys on z990, and
# 25%-30% - on z196(*). This is for 64-bit build. In 32-bit "highgprs"
# case improvement is even higher, for example on z990 it was measured
# 80%-150%. ECDSA sign is modest 9%-12% faster. Keep in mind that
# these coefficients are not ones for bn_GF2m_mul_2x2 itself, as not
# all CPU time is burnt in it...
# the effort. And indeed, the module delivers 55%-90%(*) improvement
# on haviest ECDSA verify and ECDH benchmarks for 163- and 571-bit
# key lengths on z990, 30%-55%(*) - on z10, and 70%-110%(*) - on z196.
# This is for 64-bit build. In 32-bit "highgprs" case improvement is
# even higher, for example on z990 it was measured 80%-150%. ECDSA
# sign is modest 9%-12% faster. Keep in mind that these coefficients
# are not ones for bn_GF2m_mul_2x2 itself, as not all CPU time is
# burnt in it...
#
# (*) Though no improvement could be measured if compared to code
# generated by gcc 4.1. Keep in mind that z196 is out-of-order
# execution core and is better at executing poor code.
# (*) gcc 4.1 was observed to deliver better results than gcc 4.3,
# so that improvement coefficients can vary from one specific
# setup to another.
$flavour = shift;