[LLVMdev] how to choose which alias analysis used in my pass?

[Hal Finkel]

----- Original Message -----
> From: "Jingyue Wu" <jingyue at google.com>
> To: "songlh" <songlh at cs.wisc.edu>, llvmdev at cs.uiuc.edu
> Sent: Wednesday, October 15, 2014 2:50:12 PM
> Subject: Re: [LLVMdev] how to choose which alias analysis used in my pass?
> 
> 
> Isn't -basicaa the default alias analysis already?

No, -basicaa is added (along with several others) when -O3 (or similar) is provided, but you'll only get -noaa if you run opt without specifying anything else.

 -Hal

> 
> Jingyue
> 
> 
> On Wed Oct 15 2014 at 6:42:59 AM songlh < songlh at cs.wisc.edu > wrote:
> 
> 
> Hi,
> 
> I want to use memory dependence analysis in my pass, but I feel the
> default alias analysis is not precise enough. How could I choose to
> use
> another alias analysis algorithm? I have tried opt -load mypass.so
> -basicaa xx.bc > /dev/null. But I feel the alias analysis algorithm
> does
> not change. Do I need to add something in my codes?
> 
> Thanks a lot!
> 
> Best,
> 
> Linhai
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-- 
Hal Finkel
Assistant Computational Scientist
Leadership Computing Facility
Argonne National Laboratory