[LLVMdev] Problem Adding New Pass to Alias Analysis Group

Cristianno Martins cristiannomartins at gmail.com
Wed Jul 10 13:43:46 PDT 2013

Hello John,

What opt command line arguments are you using?

If you follow this
you can see that -no-aa is the default alias analysis implementation if you
do not manually specify which AA passes you want to use. Note that you can
pass as many different implementations of AA as you want, and each of them
will be chained together for each function, like a pipeline, if the
previous one was not able to determine if there is a dependence or not.

Hope this help,

Cristianno Martins
PhD Student of Computer Science
University of Campinas
cmartins at ic.unicamp.br
 <cristiannomartins at hotmail.com>

On Wed, Jul 10, 2013 at 1:24 PM, John Criswell <criswell at illinois.edu>wrote:

> Dear All,
> I'm trying to add a new alias analysis to the alias analysis group in LLVM
> 3.2.  This new pass is linked statically into a tool that lives outside the
> LLVM source tree, so I'm trying to avoid making patches to the LLVM sources.
> code to the pass, manually scheduled it before the MemoryDependenceAnalysis
> pass, and have tried making it a FunctionPass and an ImmutablePass, but no
> matter what I do, it seems like MemoryDependenceAnalysis and other passes
> keep using the -no-aa default pass instead.
> 1) Does anyone have ideas on how to verify that my pass is part of the
> alias analysis group?
> 2) Does anyone have any ideas on what I might be doing wrong?
> Any ideas would be appreciated.
> Thanks in advance,
> -- John T.
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