[PATCH] [SimplifyCFG] Teach when it is profitable to speculate calls to @llvm.cttz/ctlz.

[hfinkel at anl.gov]

In http://reviews.llvm.org/D6679#102065, @qcolombet wrote:

> Hi Andrea,


...

> Assuming the answer of my previous question is yes, I think it makes sense to have that in SimplifyCFG.


I agree; the transformation seems reasonable. If it turns out not be be good for targets that can't completely fold the result, you could put the transformation in CodeGenPrep where you can directly query the target.


http://reviews.llvm.org/D6679

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