RFC: Modeling horizontal vector reductions

[Owen Anderson]

On Sep 11, 2013, at 4:24 PM, Arnold Schwaighofer <aschwaighofer at apple.com> wrote:

> CC’ing Owen who I have been told might have started this at one point. Owen is my thinking that threading fast-math flags into ISel is a bigger undertaking a correct estimate or is it really just “creating and maintaining a BinOp->FastMathFlag map”? I am guessing the maintaining part might be hairy.

I would love to propagate fast-math flags through ISel and kill off the FastMathFlag, but it'll be a non-trivial amount of work to update every DAGCombine to respect them properly.

--Owen
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