[PATCH] D60673: [SimplifyCFG] Improove and speed up ReduceSwitchRange

[Shawn Landden via Phabricator via llvm-commits]

shawnl created this revision.
shawnl added reviewers: lebedev.ri, nikic.
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This transform is cheap enough that there is no need to bail out. Also, the GCD calculation is unnecessary and wasteful, as it requires expensive division in the compiler. No programming languages I know of allow these numbers to be created programmatically, so there is no point in getting too smart and trying to do constant division on the keys with the GCD.

see PR 39046


Repository:
  rL LLVM

https://reviews.llvm.org/D60673

Files:
  lib/Transforms/Utils/SimplifyCFG.cpp
  test/Transforms/SimplifyCFG/switch-simplify-range.ll

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