[PATCH] D139858: [SCEVExpander] Increase "cheap" expansion budget

[Roman Lebedev via Phabricator via llvm-commits]

lebedev.ri created this revision.
lebedev.ri added reviewers: reames, mkazantsev, nikic, fhahn.
lebedev.ri added a project: LLVM.
Herald added subscribers: javed.absar, zzheng, hiraditya, nemanjai.
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lebedev.ri requested review of this revision.

It is known that having some magical cut-off does just that,
it prevents very large regressions, but is potentially suboptimal
in certain cases.

There has been several reports that the current budget
is just a tad bit too small, and by making SCEV smarter,
e.g. teaching it to handle new IR patterns,
instead of representing them as SCEVUnknown,
makes problem worse.

Let's bump (double) it.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D139858

Files:
  llvm/lib/Transforms/Utils/ScalarEvolutionExpander.cpp
  llvm/test/CodeGen/PowerPC/common-chain.ll
  llvm/test/CodeGen/PowerPC/sms-cpy-1.ll
  llvm/test/Transforms/IndVarSimplify/ARM/indvar-cost.ll
  llvm/test/Transforms/IndVarSimplify/X86/eliminate-trunc.ll
  llvm/test/Transforms/IndVarSimplify/X86/loop-invariant-conditions.ll
  llvm/test/Transforms/IndVarSimplify/exit_value_test2.ll
  llvm/test/Transforms/IndVarSimplify/no-iv-rewrite.ll
  llvm/test/Transforms/IndVarSimplify/post-inc-range.ll
  llvm/test/Transforms/IndVarSimplify/replace-loop-exit-folds.ll
  llvm/test/Transforms/IndVarSimplify/rewrite-loop-exit-values-phi.ll
  llvm/test/Transforms/LoopUnroll/X86/high-cost-expansion.ll
  llvm/test/Transforms/PhaseOrdering/X86/pr38280.ll

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