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Cryptographer
Beginner
86 Views

Cycle counts of the new Westmere instructions

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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2 Replies
capens__nicolas
New Contributor I
86 Views

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.
neni
New Contributor II
86 Views

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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