[PATCH] D13042: [SCEV] Try to prove predicates by splitting them.

Sanjoy Das via llvm-commits llvm-commits at lists.llvm.org
Mon Sep 21 18:26:29 PDT 2015

sanjoy created this revision.
sanjoy added reviewers: reames, atrick, hfinkel, nlewycky.
sanjoy added a subscriber: llvm-commits.
Herald added a subscriber: sanjoy.

This change teaches SCEV that to prove `A u< B` it is sufficient to
prove each of these facts individually:

 - B >= 0
 - A s< B
 - A >= 0

In practice, SCEV sometimes it is easier to prove these facts
individually than to prove `A u< B` as one atomic step.



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