llvm dev - Nov 2013 - [LLVMdev] LLVM IR vectorized with opt but not through the API

Hi,

I have a simple LLVM code which loop over an array and do a simple
calculation, the bytecode is here : https://gist.github.com/maattd/7322927

This code is correctly vectorized with LLVM opt 3.3, however I can't get it
to vectorize with call through the API.

Is there a way to debug the LLVM vectorizer pass with the API ?

Is there a way to just apply the exact same optimization passes as the opt
tool ? I've tried llvm::CodeGenOpt::Aggressive but it doesn't vectorize
it
neither.

Thanks,
Matthieu
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Hi Matthieu, 

Are you sure that it is the loop vectorizer and not the slp-vectorizer ?  Also,
you probably want to run mem2reg at some point, unless you generate alloca-free
IR.

Thanks,
Nadav

On Nov 5, 2013, at 9:39 AM, Matthieu Dubet <maattdd at gmail.com> wrote:
> Hi,
> 
> I have a simple LLVM code which loop over an array and do a simple
calculation, the bytecode is here : https://gist.github.com/maattd/7322927
> 
> This code is correctly vectorized with LLVM opt 3.3, however I can't
get it to vectorize with call through the API.
> 
> Is there a way to debug the LLVM vectorizer pass with the API ? 
> 
> Is there a way to just apply the exact same optimization passes as the opt
tool ? I've tried llvm::CodeGenOpt::Aggressive but it doesn't vectorize
it neither.
> 
> Thanks,
> Matthieu
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
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Did you add your target’s target transform info to the pass manager?

See "http://lists.cs.uiuc.edu/pipermail/llvmdev/2013-October/066841.html”
and following for more information,
"http://lists.cs.uiuc.edu/pipermail/llvmdev/2013-October/066882.html” might
contain a link to an example that might be help full.

Best,
Arnold

On Nov 5, 2013, at 9:39 AM, Matthieu Dubet <maattdd at gmail.com> wrote:
> Hi,
> 
> I have a simple LLVM code which loop over an array and do a simple
calculation, the bytecode is here : https://gist.github.com/maattd/7322927
> 
> This code is correctly vectorized with LLVM opt 3.3, however I can't
get it to vectorize with call through the API.
> 
> Is there a way to debug the LLVM vectorizer pass with the API ? 
> 
> Is there a way to just apply the exact same optimization passes as the opt
tool ? I've tried llvm::CodeGenOpt::Aggressive but it doesn't vectorize
it neither.
> 
> Thanks,
> Matthieu
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev

On Nov 5, 2013, at 9:39 AM, Matthieu Dubet <maattdd at gmail.com> wrote:
> Hi,
> 
> I have a simple LLVM code which loop over an array and do a simple
calculation, the bytecode is here : https://gist.github.com/maattd/7322927
> 
> This code is correctly vectorized with LLVM opt 3.3, however I can't
get it to vectorize with call through the API.
> 
> Is there a way to debug the LLVM vectorizer pass with the API ? 
> 
> Is there a way to just apply the exact same optimization passes as the opt
tool ? I've tried llvm::CodeGenOpt::Aggressive but it doesn't vectorize
it neither.
Have a look at lib/Transforms/IPO/PassManagerBuilder.cpp and tools/opt/opt.cpp
to see how opt sets up the compilation pipeline.

Best,
Arnold
> 
> Thanks,
> Matthieu
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev