[PATCH] D43826: LoopUnroll: respect pragma unroll when AllowRemainder is disabled

[Yaxun Liu via Phabricator via llvm-commits]

yaxunl created this revision.
yaxunl added reviewers: nhaehnle, efriedma, jlebar.
Herald added a subscriber: Anastasia.

Currently when AllowRemainder is disabled, pragma unroll count is not
respected even though there is no remainder. This bug causes a loop
fully unrolled in many cases even though the user specifies a unroll
count. Especially it affects OpenCL/CUDA since in many cases a loop
contains convergent instructions and currently AllowRemainder is
disabled for such loops.

This patch is related to https://reviews.llvm.org/D43594 but that one
deals with situations where remainder exists.


https://reviews.llvm.org/D43826

Files:
  lib/Transforms/Scalar/LoopUnrollPass.cpp
  test/Transforms/LoopUnroll/convergent.ll
  test/Transforms/LoopUnroll/unroll-pragmas.ll

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