[LLVMdev] Suggestion on simple optimization pass for a beginner?

[Rekha R]

This sounds good. Similar to Constant folding.
Noted :-)

Rekha


On Tue, Oct 8, 2013 at 1:33 PM, David Tweed <david.tweed at arm.com> wrote:

> Hi,****
>
> ** **
>
> If you're looking for something incredibly simple to get started with it
> might be fruitful to implement replacement of particular function calls of
> constant arguments with the appropriate result. (That might also then lead
> to opportunities for a constant propagation pass.) This would involve quite
> a bit of API usage without being actually that involved, and if you're
> doing it just for the learning experience you probably neededn't bother too
> much about the corner cases that make this tricky in general.****
>
> ** **
>
> Cheers,****
>
> Dave****
>
> ** **
>
> *From:* llvmdev-bounces at cs.uiuc.edu [mailto:llvmdev-bounces at cs.uiuc.edu] *On
> Behalf Of *Rekha R
> *Sent:* 06 October 2013 13:24
> *To:* LLVM Developers Mailing List
> *Subject:* [LLVMdev] Suggestion on simple optimization pass for a
> beginner?****
>
> ** **
>
> Hello,****
>
> I am a beginner in LLVM development with the aim of writing a new
> optimization pass. But then before I could do that, I thought of writing
> simple passes. I could successfully implement the Hello pass as given in
> the doc. Then I wrote a simple Constant Folding pass - evaluate
> instructions of the form c=10+20 and replace all uses of c with 30. Only
> later did I realize that Clang does this optimization while building the
> IR. Hence I couldn't check whether my constant folding pass is "working". I
> have two questions:****
>
> 1. Is there a way to disable constant folding during IR development by
> clang?****
>
> 2. If not, can someone suggest a simple optimization (simple in complexity
> on the lines of constant folding) to get started?****
>
> My intention is to get used to the APIs in LLVM and not get cluttered by
> the optimization itself. (Hence I chose constant folding in the first
> place.)****
>
> Any opinion will be appreciated :)****
>
> Regards,****
>
> Rekha ****
>



-- 
Rekha
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