Anna Thomas 1d02b13eb7 [LoopPredication] Enable predication when latchCheckIV is wider than rangeCheck ... Summary: This patch allows us to predicate range checks that have a type narrower than the latch check type. We leverage SCEV analysis to identify a truncate for the latchLimit and latchStart. There is also safety checks in place which requires the start and limit to be known at compile time. We require this to make sure that the SCEV truncate expr for the IV corresponding to the latch does not cause us to lose information about the IV range. Added tests show the loop predication over range checks that are of various types and are narrower than the latch type. This enhancement has been in our downstream tree for a while. Reviewers: apilipenko, sanjoy, mkazantsev Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D39500 llvm-svn: 317269		2017-11-02 21:21:02 +00:00
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basic.ll	[LoopPredication] Handle the case when the guard and the latch IV have different offsets	2017-10-27 14:46:17 +00:00
nested.ll	[LoopPredication] Check whether the loop is already guarded by the first iteration check condition	2017-10-12 21:21:17 +00:00
visited.ll	[LoopPredication] Check whether the loop is already guarded by the first iteration check condition	2017-10-12 21:21:17 +00:00
widened.ll	[LoopPredication] Enable predication when latchCheckIV is wider than rangeCheck	2017-11-02 21:21:02 +00:00