[LLVMdev] [RFC] add Function Attribute to disable optimization

[Andrea_DiBiagio at sn.scee.net]

> From: Nick Lewycky <nicholas at mxc.ca>
> Andrea_DiBiagio at sn.scee.net wrote:
> > So..
> > I have investigated more on how a new function attribute to disable
> > optimization on a per-function basis could be implemented.
> > At the current state, with the lack of specific support from the pass
> > managers I found two big problems when trying to implement a prototype
> > implementation of the new attribute.
> >
> > Here are the problems found:
> > 1) It is not safe to disable some transform passes in the backend.
> 
> Hold on. By 'backend' do you mean LLVM IR FunctionPasses, or LLVM 
> CodeGen MachineFunctionPasses? The former you should be able to turn 
> off, reorder, etc., at will. The latter is a fixed pipeline, you either 
> choose the -O0 pipeline or the -O2 pipeline.

Sorry, I meant CodeGen MachineFunctionPasses.


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