search for: steenaa

...r pass (e.g. ds- aa) to have a go at. > This will continue until it finds a definite answer or runs out of AA > passes. Hi David, At this level, I can understand how it works. I was confused because I have been looking at the source code for implementing them. All the globalmodref, scev-aa, steenaa and ds-aa are only subclasses of the AliasAnalysis class, so I cannot see how ds-aa can automatically call basicaa. What I guess is that the order of the flags matters. This means if I want to chain a simple AA (say, -basicaa) and a fancier one (ds-aa), I should add the -basicaa before -ds-aa to...

Jianzhou Zhao <jianzhou <at> seas.upenn.edu> writes: > At this level, I can understand how it works. I was confused because I > have been looking at the source code for implementing them. All the > globalmodref, scev-aa, steenaa and ds-aa are only subclasses of the > AliasAnalysis class, so I cannot see how ds-aa can automatically call > basicaa. There's some magic in the pass registration which adds them with a `previous' link between AA passes, so the base AliasAnalysis class ends up calling the previous...

Jianzhou Zhao <jianzhou <at> seas.upenn.edu> writes: > The documents say that all the aa analysis are chained, and give an > example like opt -basicaa -ds-aa -licm. In this case, does ds-aa > automatically call basicaa for the case when ds-aa can only return > MayAlias? This looks magic to me. Is this handled by AnalysisGroup > magically? As I understand it, the

On Tue, Jan 3, 2012 at 4:55 PM, Chris Lattner <clattner at apple.com> wrote: > On Jan 3, 2012, at 1:53 PM, Jianzhou Zhao wrote: >> I see. I asked the question because LLVM provides several alias >> analysis, and I was wondering how to decide which one should be used >> for compiling most programs. >> >> I think the basicaa is the default one, but by looking