https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96208
--- Comment #4 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Richard Biener <rgue...@gcc.gnu.org>: https://gcc.gnu.org/g:dd86a5a69cbda40cf76388a65d3317c91cb2b501 commit r14-2117-gdd86a5a69cbda40cf76388a65d3317c91cb2b501 Author: Richard Biener <rguent...@suse.de> Date: Thu Jun 22 11:40:46 2023 +0200 tree-optimization/96208 - SLP of non-grouped loads The following extends SLP discovery to handle non-grouped loads in loop vectorization in the case the same load appears in all lanes. Code generation is adjusted to mimick what we do for the case of single element interleaving (when the load is not unit-stride) which is already handled by SLP. There are some limits we run into because peeling for gap cannot cover all cases and we choose VMAT_CONTIGUOUS. The patch does not try to address these issues yet. The main obstacle is that these loads are not STMT_VINFO_GROUPED_ACCESS and that's a new thing with SLP. I know from the past that it's not a good idea to make them grouped. Instead the following massages places to deal with SLP loads that are not STMT_VINFO_GROUPED_ACCESS. There's already a testcase testing for the case the PR is after, just XFAILed, the following adjusts that instead of adding another. I do expect to have missed some so I don't plan to push this on a Friday. Still there may be feedback, so posting this now. Bootstrapped and tested on x86_64-unknown-linux-gnu. PR tree-optimization/96208 * tree-vect-slp.cc (vect_build_slp_tree_1): Allow a non-grouped load if it is the same for all lanes. (vect_build_slp_tree_2): Handle not grouped loads. (vect_optimize_slp_pass::remove_redundant_permutations): Likewise. (vect_transform_slp_perm_load_1): Likewise. * tree-vect-stmts.cc (vect_model_load_cost): Likewise. (get_group_load_store_type): Likewise. Handle invariant accesses. (vectorizable_load): Likewise. * gcc.dg/vect/slp-46.c: Adjust for new vectorizations. * gcc.dg/vect/bb-slp-pr65935.c: Adjust.
