[all-commits] [llvm/llvm-project] 6eab5c: [LSR] Early exit for RateFormula when it is alread...

[eop Chen via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 6eab5cade71459bc187eeeb364b9a94972c05696
      https://github.com/llvm/llvm-project/commit/6eab5cade71459bc187eeeb364b9a94972c05696
  Author: eopXD <eop.chen at sifive.com>
  Date:   2022-06-01 (Wed, 01 Jun 2022)

  Changed paths:
    M llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp

  Log Message:
  -----------
  [LSR] Early exit for RateFormula when it is already losing. NFC

This patch does not effect any behavior of the current code.

The codebase implicitly implies that `Cost::RateFormula` is only called
when the `Cost` is not in losing status, or else there may be possible
to trigger the assertion of `Cost::isValid`.

The intention here is to prevent mis-use where future development
allow `Cost` that is already loser to call `Cost::RateFormula` - Early
exit when `Cost` is already losing.

Reviewed By: Meinersbur, #loopoptwg

Differential Revision: https://reviews.llvm.org/D125670