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| author | Richard Biener <rguenther@suse.de> | 2021-03-23 09:10:17 +0100 |
|---|---|---|
| committer | Richard Biener <rguenther@suse.de> | 2021-03-23 10:50:04 +0100 |
| commit | ffa6a7fba1f87b6b47763882be411a339061492d (patch) | |
| tree | 0b5285e83c389a7c14bf01d65845ab6f26f0434f /gcc/tree-vect-slp.c | |
| parent | fffefe3d9d1715f83c82331f2265e040f42d09fe (diff) | |
| download | gcc-ffa6a7fba1f87b6b47763882be411a339061492d.zip gcc-ffa6a7fba1f87b6b47763882be411a339061492d.tar.gz gcc-ffa6a7fba1f87b6b47763882be411a339061492d.tar.bz2 | |
tree-optimization/99721 - avoid SLP nodes we cannot schedule
This makes sure we'll not run into SLP scheduling issues later by
rejecting all-constant children nodes without any scalar stmts early.
2021-03-23 Richard Biener <rguenther@suse.de>
PR tree-optimization/99721
* tree-vect-slp.c (vect_slp_analyze_node_operations):
Make sure we can schedule the node.
* gfortran.dg/vect/pr99721.f90: New testcase.
Diffstat (limited to 'gcc/tree-vect-slp.c')
| -rw-r--r-- | gcc/tree-vect-slp.c | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/gcc/tree-vect-slp.c b/gcc/tree-vect-slp.c index 0d24be7..f1a2b5d 100644 --- a/gcc/tree-vect-slp.c +++ b/gcc/tree-vect-slp.c @@ -3893,7 +3893,7 @@ vect_slp_analyze_node_operations (vec_info *vinfo, slp_tree node, { if (dump_enabled_p ()) dump_printf_loc (MSG_NOTE, vect_location, - "Failed cyclic SLP reference in %p", node); + "Failed cyclic SLP reference in %p\n", node); return false; } gcc_assert (SLP_TREE_DEF_TYPE (node) == vect_internal_def); @@ -3907,6 +3907,7 @@ vect_slp_analyze_node_operations (vec_info *vinfo, slp_tree node, bool res = true; unsigned visited_rec_start = visited_vec.length (); unsigned cost_vec_rec_start = cost_vec->length (); + bool seen_non_constant_child = false; FOR_EACH_VEC_ELT (SLP_TREE_CHILDREN (node), i, child) { res = vect_slp_analyze_node_operations (vinfo, child, node_instance, @@ -3914,6 +3915,18 @@ vect_slp_analyze_node_operations (vec_info *vinfo, slp_tree node, cost_vec); if (!res) break; + if (child && SLP_TREE_DEF_TYPE (child) != vect_constant_def) + seen_non_constant_child = true; + } + /* We're having difficulties scheduling nodes with just constant + operands and no scalar stmts since we then cannot compute a stmt + insertion place. */ + if (!seen_non_constant_child && SLP_TREE_SCALAR_STMTS (node).is_empty ()) + { + if (dump_enabled_p ()) + dump_printf_loc (MSG_NOTE, vect_location, + "Cannot vectorize all-constant op node %p\n", node); + res = false; } if (res) |