llvm dev - Nov 2011 - [LLVMdev] Fwd: Problem getting LoopInfo inside non-LoopPass

Ryan,

[ Please continue the discussion on mailing for the benefit of everyone. ]

On Nov 10, 2011, at 10:31 AM, Ryan Taylor wrote:
> I need to iterate bottom up on the nodes, but within that I want to break
up BBs within a loop. I could just create a loop pass as another opt and call
that, I just thought it'd be easier to get the loop info inside the opt
I'm already doing.
It is better and easier to write a separate pass.
-
Devang

Basically I have two separate passes (first is a loop pass) which are two
different files and two different opts but I need to keep the data
consistent (ie, I want the changes to show up the resulting .bc output file
from the first (loop) pass so the second pass can use these new names.
Currently, when I print out "BB->getName().str()" after the code
below, I
get the correct renaming but this doesn't show up in the output file.

I'm calling the opt like this:

opt -load Release/lib/OptFile.so -optTag -S <file.bc> -o file.ll

I have also tried:

opt -load Release/lib/OptFile.so -optTag <file.bc> -o file.bc

Thanks.

---------- Forwarded message ----------
From: Ryan Taylor <ryta1203 at gmail.com>
Date: Wed, Nov 16, 2011 at 5:23 PM
Subject: Re: [LLVMdev] Problem getting LoopInfo inside non-LoopPass
To: llvmdev at cs.uiuc.edu


LLVMers,

  So, I'm trying to write a pass that changes the names of the basic blocks
through the use of Value, so:

  Value *V = *BasicBlockPtr;
  const Twine Tname("new_name");
  V->setName(Tname);

But when I run the opt and look at the IR output nothing is changed? Not
sure what I'm doing wrong.

Thanks.
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