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Commentary section update in sha512-x86_64.pl.

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This commit is contained in:
Andy Polyakov 2005-07-25 13:29:42 +00:00
parent b3836ed3cb
commit 4a5b8a5bee
1 changed files with 6 additions and 5 deletions
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11
crypto/sha/asm/sha512-x86_64.pl
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@ -8,7 +8,8 @@
#
# sha256/512_block procedure for x86_64.
#
# 40% improvement over compiler-generated code on Opteron. No magical
# 40% improvement over compiler-generated code on Opteron. On EM64T
# sha256 was observed to run >80% faster and sha512 - >40%. No magical
# tricks, just straight implementation... I really wonder why gcc
# [being armed with inline assembler] fails to generate as fast code.
# The only thing which is cool about this module is that it's very
@ -34,10 +35,10 @@
#
# Special note on Intel EM64T. While Opteron CPU exhibits perfect
# perfromance ratio of 1.5 between 64- and 32-bit flavors [see above],
# [currently available] EM64T CPUs apparently are far from it. 64-bit
# version, sha512_block, is hardly faster than 32-bit one. This is
# presumably because 64-bit shifts/rotates apparently are not atomic
# instructions, but implemented in microcode.
# [currently available] EM64T CPUs apparently are far from it. On the
# contrary, 64-bit version, sha512_block, is ~30% *slower* than 32-bit
# sha256_block:-( This is presumably because 64-bit shifts/rotates
# apparently are not atomic instructions, but implemented in microcode.
$output=shift;
open STDOUT,"| $^X ../perlasm/x86_64-xlate.pl $output";