[llvm-dev] Code compaction

Friedman, Eli via llvm-dev llvm-dev at lists.llvm.org
Fri Feb 24 12:43:24 PST 2017

On 2/24/2017 12:24 PM, Ilya Skapenko via llvm-dev wrote:
> Hello,
> I decided to implement some of code compaction 
> <http://llvm.org/OpenProjects.html#compaction> passes. To start, I 
> chose basic block factoring out, suggested in article 
> <http://users.elis.ugent.be/%7Ebrdsutte/research/publications/2000TOPLASdebray.pdf> (Section 
> 3.3). Unlike the article, I implemented procedural abstraction for 
> basic blocks on LLVM-IR level (probably it was not the best choice) 
> and faced a problem: Is there any efficient way to determine, what 
> size will instruction take in some particular architecture?
> Reference to the pass: https://github.com/skapix/codeCompaction 
> <https://github.com/skapix/codeCompaction>
> It is my first project, connected to LLVM infrastructure, I would 
> appreciate any help.

llvm/Analysis/CodeMetrics.h is what the inliner/unroller/etc. use to 
estimate cost.  It's not particularly precise, but it's good enough for 
most purposes.


Employee of Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project

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