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sebitab
Beginner
115 Views

Instruction set latency

Hello, I am working on assembly code optimization, I already read the code optimization manual, but I am interested in a list with the instruction set latencies. I search the intel site but I could not find it.
Where can I found this?.

Thanks for your answers.
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4 Replies
Thomas_W_Intel
Employee
115 Views

Quoting - sebitab
Hello, I am working on assembly code optimization, I already read the code optimization manual, but I am interested in a list with the instruction set latencies. I search the intel site but I could not find it.
Where can I found this?.

Thanks for your answers.

The latencies are listed in Appendix C of the "Intel 64 and IA-32 Architectures Optimization Reference Manual", which can be downloaded here.

Kind regards
Thomas
jancino
Beginner
115 Views

Quoting - sebitab
Hello, I am working on assembly code optimization, I already read the code optimization manual, but I am interested in a list with the instruction set latencies. I search the intel site but I could not find it.
Where can I found this?.

Thanks for your answers.
You can use instruction latencies only for very rough approximation of real number of cycles taken, because actual results depends on whetevera operands are loaded to cache, other instructions in pipeline (conditions) and so on....
craigj0
Beginner
115 Views

I find the instruction tables found here: http://www.agner.org/optimize/ to be very helpful. They are not perfect but they provide a pretty good estimate.
Tal_U_Intel
Employee
115 Views

Quoting - craigj0
I find the instruction tables found here: http://www.agner.org/optimize/ to be very helpful. They are not perfect but they provide a pretty good estimate.

You can also try using Intel Architecture Code Analyzer available on:
http://software.intel.com/en-us/articles/intel-architecture-code-analyzer/

It can help you find the dependency chains in your code.

Tal
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