search for: concessesion

...You mean that LICM and Unswitching should be left for later? For the purpose of exposing scalar optimizations, I'm not sure I agree with that but I'd be interested in examples. I think you're only worried about the impact on loop nest optimizations. Admittedly I'm not making much concessesion for that, because I think of loop nest optimization as a different tool that will probably want fairly substantial changes to the pass pipeline anyway. Here's a few of ways it might work: (1) Loop nest optimizer extends the standard PMB by plugging in its own passes prior to Generic Loop Opts...

...bound on how late this transformation could be done. I guess the approach of being able to extend/modify what the PMB creates, that you mention below, would address this problem. > I think you're only worried about the impact on loop nest optimizations. Admittedly I'm not making much concessesion for that, because I think of loop nest optimization as a different tool that will probably want fairly substantial changes to the pass pipeline anyway. Yes, I agree. My major concern is that we need to be careful that we don't accidentally make things harder for ourselves. I very much agree...

On 7/16/2013 11:38 PM, Andrew Trick wrote: > Since introducing the new TargetTransformInfo analysis, there has been some confusion over the role of target heuristics in IR passes. A few patches have led to interesting discussions. > > To centralize the discussion, until we get some documentation and better APIs in place, let me throw out an oversimplified Straw Man for a new pass pipline.

Since introducing the new TargetTransformInfo analysis, there has been some confusion over the role of target heuristics in IR passes. A few patches have led to interesting discussions. To centralize the discussion, until we get some documentation and better APIs in place, let me throw out an oversimplified Straw Man for a new pass pipline. It serves two purposes: (1) an overdue reorganization of