Anna Thomas 7f4b26e189 [LICM] Hoist loads that are dominated by invariant.start intrinsic, and are invariant in the loop. ...

Summary:
We can hoist out loads that are dominated by invariant.start, to the preheader.
We conservatively assume the load is variant, if we see a corresponding
use of invariant.start (it could be an invariant.end or an escaping
call).

Reviewers: mkuper, sanjoy, reames

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D29331

llvm-svn: 293887

2017-02-02 13:22:03 +00:00

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