[PATCH] D20115: Loop unroller: set thresholds for optsize and minsize functions to zero

[Hans Wennborg via llvm-commits]

hans created this revision.
hans added reviewers: mamai, rnk.
hans added a subscriber: llvm-commits.
Herald added a subscriber: mzolotukhin.

Before r268509, Clang would disable the loop unroll pass when optimizing for size. That commit enabled it, to be able to support unroll pragmas in -Os builds. However, this regressed binary size in one of Chromium's DLLs with ~100 KB.

This restores the original behaviour of no unrolling at -Os, but doing it in LLVM instead of Clang makes more sense, and also allows the pragmas to keep working.

http://reviews.llvm.org/D20115

Files:
  lib/Transforms/Scalar/LoopUnrollPass.cpp
  test/Transforms/LoopUnroll/PowerPC/a2-unrolling.ll
  test/Transforms/LoopUnroll/PowerPC/p7-unrolling.ll
  test/Transforms/LoopUnroll/partial-unroll-optsize.ll
  test/Transforms/LoopUnroll/unroll-opt-attribute.ll

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