[all-commits] [llvm/llvm-project] 5d0bfd: [MLIR][SCFToGPU] Guard operands before AffineApply...

[Shashi Shankar via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 5d0bfd1bf8ac6b1ceb37c7f30058d0f62e636036
      https://github.com/llvm/llvm-project/commit/5d0bfd1bf8ac6b1ceb37c7f30058d0f62e636036
  Author: Shashi Shankar <shashishankar1687 at gmail.com>
  Date:   2025-11-20 (Thu, 20 Nov 2025)

  Changed paths:
    M mlir/lib/Conversion/SCFToGPU/SCFToGPU.cpp
    M mlir/test/Conversion/SCFToGPU/parallel_loop.mlir

  Log Message:
  -----------
  [MLIR][SCFToGPU] Guard operands before AffineApplyOp::create to avoid crash (#167959)

This fixes a crash in SCF→GPU when building the per‑dim index for mapped
scf.parallel.

**Change**:
- Map step/lb through cloningMap, then run ensureLaunchIndependent.
- If either is still unavailable at launch scope, emit a match‑failure;
otherwise build the affine.apply.

**Why this is correct:**
- Matches how the pass already handles launch bounds; avoids creating an
op with invalid operands and replaces a segfault with a clear
diagnostic.

**Tests**:
- Added two small regressions that lower to gpu.launch and exercise the
affine.apply path.

Fixes :  #167654

Signed-off-by: Shashi Shankar <shashishankar1687 at gmail.com>



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