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1135 Discussions

Cycle counts of the new Westmere instructions

Cryptographer
Beginner
‎04-13-2010 12:10 AM
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How many cycles do the new instructions require
and can they be paired with other intructions?

aesimc
aeskeygenassist
aesenc
aesenclast
aesdec
aesdeclast
pclmulqdq
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capens__nicolas
New Contributor I
‎04-21-2010 04:32 PM
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The AES-NI white paper has some performance results from which you could estimate the instruction latencies: http://software.intel.com/en-us/articles/intel-advanced-encryption-standard-aes-instructions-set/. It explicitly mentions that they are pipelined too.

You can expect pclmulqdq to perform the same as other vector multiplications.
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neni
New Contributor II
‎04-22-2010 04:06 PM
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it changes by impl, you can take your aes kernel(s) and run it through the CodenAnalyzer to understand tput, latency, etc
http://software.intel.com/en-us/articles/intel-architecture-code-analyzer/

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