[LLVMdev] "pure" functions"

[Chris Lattner]

On Sun, 4 Jun 2006, Vladimir Prus wrote:
> say I've a LLVM module with a call instruction. The called function is
> "pure", that is it has no side-effects at all. How can I communicate this
> to LLVM, so that the function call can be removed if the return value is
> never used?

There isn't a way to do this from the source code yet.  However, if this 
is a standard library function, you can add it to the end of 
lib/Analysis/BasicAliasAnalysis.cpp.  Search of "isspace".

-Chris

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