[PATCH] D140698: [LoopUnroll] Be more permissive to high-cost loop trip count SCEV's

[Roman Lebedev via Phabricator via llvm-commits]

lebedev.ri created this revision.
lebedev.ri added reviewers: reames, mkazantsev, nikic.
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Loop unroll's loop trip count expansion is optionally
guarded by a 'cheap expansion budget' cut-off.
Unlike the loop ind var simplification, here,
if we do unroll the loop, it's usually beneficial,
so it's generally justified to deal with a slightly
more costly loop trip counts.

Alternative to D139858 <https://reviews.llvm.org/D139858>.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D140698

Files:
  llvm/lib/Transforms/Utils/LoopUnrollRuntime.cpp
  llvm/test/Transforms/LoopUnroll/X86/high-cost-expansion.ll
  llvm/test/Transforms/LoopUnroll/high-cost-trip-count-computation.ll

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