[LLVMdev] function calls

apala guha aguha at uchicago.edu
Tue Oct 9 11:35:55 PDT 2012

Thanks. Is there a way I can ignore the instructions calling LLVM 
intrinsics? Or, prevent them from getting into the IR representation?

Basically, I do not need optimization passes. I am only interested in 
analyzing the intermediate representation.


On 10/09/2012 01:24 PM, John Criswell wrote:
> On 10/9/12 1:19 PM, apala guha wrote:
>> Hi,
>> I am seeing some strange function calls in the LLVM IR, such as, 
>> 'call llvm.lifetime.start'. What are these functions and why are they 
>> appearing in the IR?
> These are LLVM intrinsics that provide information to the optimization 
> passes.  See the Language reference manual 
> (http://llvm.org/docs/LangRef.html) for a description of what these 
> intrinsics do.
> -- John T.
>> Thanks.
>> -Apala
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