[all-commits] [llvm/llvm-project] 59b23c: [MLIR][SCF] Remove loop invariant arguments of scf...

[Abhishek Varma via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 59b23c4aecccd8a0687c71b3afc55fd233b935c2
      https://github.com/llvm/llvm-project/commit/59b23c4aecccd8a0687c71b3afc55fd233b935c2
  Author: Abhishek Varma <abhishek.varma at cerebras.net>
  Date:   2022-02-03 (Thu, 03 Feb 2022)

  Changed paths:
    M mlir/lib/Dialect/SCF/SCF.cpp
    M mlir/test/Dialect/SCF/canonicalize.mlir

  Log Message:
  -----------
  [MLIR][SCF] Remove loop invariant arguments of scf.while

-- This commit adds a canonicalization pattern on scf.while to remove
   the loop invariant arguments.
-- An argument is considered loop invariant if the iteration argument value is
   the same as the corresponding one being yielded (at the same position) in both
   the before/after block of scf.while.
-- For the arguments removed, their use within scf.while and their corresponding
   scf.while's result are replaced with their corresponding initial value.

Signed-off-by: Abhishek Varma <abhishek.varma at polymagelabs.com>

Reviewed By: ftynse

Differential Revision: https://reviews.llvm.org/D116923