Difference between revisions of "CodeCompositionExpensive"

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[[Category:Performance Pattern]]
 
== Description ==
 
== Description ==
 
The pattern "Code composition - expensive instructions" can be used to describe what happens if you use expensive instructions although there are cheaper ways.
 
The pattern "Code composition - expensive instructions" can be used to describe what happens if you use expensive instructions although there are cheaper ways.

Latest revision as of 15:17, 3 September 2019

Description

The pattern "Code composition - expensive instructions" can be used to describe what happens if you use expensive instructions although there are cheaper ways.

Symptoms

Like Instruction Overhead.

For a piece of high-level code, the compiler outputs a lot of instructions although is could be done in less. One common example are non-vectorized instructions.


Detection

High CPI if the problem is large-latency arithmetic


Possible optimizations and/or fixes

Reduce complexity to that the compiler can generate better code


Applicable applications or algorithms or kernels