[all-commits] [llvm/llvm-project] 77efb7: [IndVars] Replace checks with invariants if we can...

[max-azul via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 77efb73c672762ce28cfff793db414ce05e3c46a
      https://github.com/llvm/llvm-project/commit/77efb73c672762ce28cfff793db414ce05e3c46a
  Author: Max Kazantsev <mkazantsev at azul.com>
  Date:   2020-11-13 (Fri, 13 Nov 2020)

  Changed paths:
    M llvm/lib/Transforms/Scalar/IndVarSimplify.cpp
    M llvm/test/Transforms/IndVarSimplify/predicated_ranges.ll

  Log Message:
  -----------
  [IndVars] Replace checks with invariants if we cannot remove them

If we cannot prove that the check is trivially true, but can prove that it either
fails on the 1st iteration or never fails, we can replace it with first iteration check.

Differential Revision: https://reviews.llvm.org/D88527
Reviewed By: skatkov