[LLVMdev] Optimization of calls to functions without side effects (from Kaleidoscope example)

[Rob Pieke]

Still no luck after switching to:

	theFPM->add( new llvm::TargetData( *theExecutionEngine->getTargetData() ) );
	theFPM->add( llvm::createBasicAliasAnalysisPass() );
	theFPM->add( llvm::createInstructionCombiningPass() );
	theFPM->add( llvm::createReassociatePass() );
	theFPM->add( llvm::createGVNPass() );
	theFPM->add( llvm::createCFGSimplificationPass() );

Based on output from "llvm-ld -version" and "clang -v" I'm using:

  llvm version 2.9svn
  clang version 2.9 (trunk 118171)



> -----Original Message-----
> From: Duncan Sands [mailto:baldrick at free.fr]
> Sent: Monday, November 15, 2010 4:32 PM
> To: Rob Pieke
> Cc: llvmdev at cs.uiuc.edu; Dan Gohman
> Subject: Re: [LLVMdev] Optimization of calls to functions without side
> effects (from Kaleidoscope example)
> 
> Hi Rob,
> 
> > I'm using the gvn pass, not sure about basic-aa.
> 
> if you are using LLVM from svn then you need to specify the basic-aa
> analysis,
> otherwise gvn won't unify calls to readonly/readnone functions.  This
> is new
> behaviour introduced by Dan; probably the tutorial should be updated.
> 
> Ciao,
> 
> Duncan.