[LLVMdev] how to choose which alias analysis used in my pass? (original) (raw)
Roel Jordans r.jordans at tue.nl
Thu Oct 16 02:46:42 PDT 2014
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Yes, next to loading the pass you'll also have to add your pass to the list of passes to run.
For the hello example it is something like:
opt -load hello.so -hello input.bc
The option name is the first argument to the RegisterPass line IIRC.
Cheers, Roel
On 16/10/14 02:18, songlh wrote:
I run the following command: opt -load MyPass.so -basicaa -MyPass ./test.bc -debug-pass=Structure -disable-output Then I got: Pass Arguments: -targetlibinfo -datalayout -notti -basictti -x86tti -no-aa -basicaa -Redundancy -preverify -domtree -verify Target Library Information Data Layout No target information Target independent code generator's TTI X86 Target Transform Info No Alias Analysis (always returns 'may' alias) Basic Alias Analysis (stateless AA impl) ModulePass Manager Redundancy Checking Unnamed pass: implement Pass::getPassName() FunctionPass Manager Preliminary module verification Dominator Tree Construction Module Verifier Pass Arguments: -no-aa -domtree -postdomtree -loops -memdep No Alias Analysis (always returns 'may' alias) FunctionPass Manager Dominator Tree Construction Post-Dominator Tree Construction Natural Loop Information Memory Dependence Analysis It looks to me that when loading MyPass, basicaa is not used. Do I make some mistakes in the opt parameters? Thanks a lot! Best, Linhai
On 2014-10-15 14:56, Hal Finkel wrote: ----- 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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