[LLVMdev] speculative parallelization in LLVM

Jimborean Alexandra xinfinity_a at yahoo.com
Tue Jul 19 02:58:35 PDT 2011

I might need a switching mechanism a little bit more complicated to handle 
instrumentation, several parallel versions and the original version. And also, 
the "original"  version I send to Polly, is not the original one generated from 
the source code, but the one with pointers replaced with arrays.

But I will investigate the solution you propose, maybe I can adapt it and use it 
more easily, as it is already integrated in Polly.


From: Tobias Grosser <tobias at grosser.es>
To: Jimborean Alexandra <xinfinity_a at yahoo.com>
Cc: Renato Golin <rengolin at systemcall.org>; llvmdev at cs.uiuc.edu
Sent: Tue, July 19, 2011 11:48:12 AM
Subject: Re: [LLVMdev] speculative parallelization in LLVM

On 07/19/2011 11:46 AM, Jimborean Alexandra wrote:
> Hi Renato,
> No, I cannot, but in case it is, I want to take advantage of this. In
> case it is not, the instrumentation code will detect this at runtime and
> simply roll back to the original version. I will always keep an original
> version available, in addition to the ones I modify with Polly. However,
> initially I will speculate that it is allocated contiguously.

Keeping the original version should be easy, as Polly always leaves both 
versions in the LLVM-IR.

At the moment we have

if (true)

You could just replace the true with your runtime check.

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