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ghash-ia64.pl: excuse myself from implementing "528B" variant.

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This commit is contained in:
Andy Polyakov 2010-07-26 21:54:21 +00:00
parent 6559b40df0
commit 85e28dfa6f
1 changed files with 9 additions and 0 deletions
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crypto/modes/asm/ghash-ia64.pl
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@ -20,6 +20,15 @@
# something else sha1-ia64.pl module processes one byte in 6.0 cycles.
# On Itanium GHASH should run at ~8.5 cycles per byte.
# Note about "528B" variant. In Itanium 2 case it makes lesser sense
# to implement it for following reason. Because number of functional
# units is naturally limited, it's impossible to implement "528B" loop
# in 4 cycles, only in 5. This means that theoretically performance
# improvement can't be more than 20%, ~15% is more realistic. This
# is considered below justification level for implementing new code.
# Not to mention that on original Itanium it would actually run
# slower, spending >9 cycles per byte.
$output=shift and (open STDOUT,">$output" or die "can't open $output: $!");
if ($^O eq "hpux") {