search for: targettransforminfoimplbase

...el -analyze (the actual cost model tests) seem to not matter for this. The huge cost I've assigned division doesn't prevent the loop from being unrolled, because it isn't actually considered when loop unrolling. The loop unrolled uses CodeMetrics, which via getUserCost ultimately uses TargetTransformInfoImplBase::getOperationCost(), which returns various fixed values (4 for division (TCC_Expensive, but this isn't nearly expensive enough)). getOperationCost only uses the type and opcode to estimate, so it doesn't require a value. No target overrides this. The hooks that targets do really implement...

----- Original Message ----- > From: "Bjarke Roune" <broune at google.com> > To: "Hal Finkel" <hfinkel at anl.gov> > Cc: llvmdev at cs.uiuc.edu, "Jingyue Wu" <jingyue at google.com> > Sent: Wednesday, July 1, 2015 2:27:59 PM > Subject: Re: [LLVMdev] Deriving undefined behavior from nsw/inbounds/poison for scalar evolution > >