[LLVMdev] Avoiding Constant Folding

[Cuong Pham]

Thanks for your explanation and advice. It is very useful for me.

--Cuong

On Tue, Jun 14, 2011 at 10:38 AM, Duncan Sands <baldrick at free.fr> wrote:

> Hi Cuong,
>
> > I am trying to avoid using stack memory (or mutable variable is the term
> > used in the tutorial). I am also trying to optimize the code as much as I
> > can before using optimizer passes such as mem2reg (to reduce the compile
> > time as well).
>
> I don't think there is much point in avoiding stack variables (using them
> makes your life much simpler -> easier to have your front-end be correct;
> passes like mem2reg will turn your variables into registers if possible
> anyway).  And there's also not much point in trying to keep the bitcode
> small
> so as to speed up the optimizers: it will just make your front-end more
> complicated, while probably the gains (if any) are insignificant.  My
> advice
> is to keep your front-end as simple as possible.  You can run some
> per-function
> passes as you output each function, to clean it up and reduce the bitcode
> size,
> for example simplifycfg+scalarrepl+instcombine, if memory usage is a
> problem.
>
> Ciao, Duncan.
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