llvm-project

dd0c7f1f - [MLIR][Linalg] Fix crash in tileToForallOpImpl for rank-0 ops (#189000)

[MLIR][Linalg] Fix crash in tileToForallOpImpl for rank-0 ops (#189000) When tiling a rank-0 linalg.generic op, tileUsingSCF returns an empty loops vector (rank-0 ops have no parallel dimensions and produce no scf.forall). Two call sites unconditionally accessed tilingResult.loops.front(), causing a crash: - tileToForallOpImpl: the loop normalization block was entered whenever mixedNumThreads was empty, regardless of whether any loops exist. Guard it with \!tilingResult.loops.empty(). - TileUsingForallOp::apply: tileOps.push_back was called unconditionally. Guard it with \!tilingResult.loops.empty(). Add regression tests for both the tile_sizes and num_threads paths, verifying that the linalg.generic is preserved and no scf.forall is emitted. Fixes #187073 Assisted-by: Claude Code