[LLVMdev] loop detection

[Andrew Trick]

On Jul 23, 2012, at 5:04 PM, Edvard Ghazaryan <edvard_gh at yahoo.com> wrote:

> 
> 
> Hello .
> 
> I'm trying to implement FunctionPass for detecting loops in llvm IR.
> How can I get <condition> for loop from llvm::Loop object.?
> Is there any example?

I'm not sure I understand the question. Here are some tips.

Loop::getLoopLatch() give you a canonical "latch" block if it exists. BasicBlock::getTerminator() gives you the branch. This is done throughout the code, so you can see the pattern.

Loop::getExitingBlocks() gives you all the branches that may leave the loop.

Or may want to do your own search for the "last" exit by following block predecessors from the loop header.

-Andy


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