[all-commits] [llvm/llvm-project] f6f1ab: [mlir][scf] Fix `for-loop-peeling` crash (#77697)

[Felix Schneider via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: f6f1ab9d90252f9b943e77a64e30a3d26ef7cbbb
      https://github.com/llvm/llvm-project/commit/f6f1ab9d90252f9b943e77a64e30a3d26ef7cbbb
  Author: Felix Schneider <fx.schn at gmail.com>
  Date:   2024-01-12 (Fri, 12 Jan 2024)

  Changed paths:
    M mlir/lib/Dialect/SCF/Transforms/LoopSpecialization.cpp
    M mlir/test/Dialect/SCF/for-loop-peeling.mlir

  Log Message:
  -----------
  [mlir][scf] Fix `for-loop-peeling` crash (#77697)

Before applying the peeling patterns, it can happen that the `ForOp`
gets a step of zero during folding. This leads to a division-by-zero
down the line.

This patch adds an additional check for a constant-zero step and a
 test.

Fix https://github.com/llvm/llvm-project/issues/75758