* [PATCH] tree-optimization/97886 - deal with strange LC PHI nodes
@ 2020-11-18 10:24 Richard Biener
0 siblings, 0 replies; only message in thread
From: Richard Biener @ 2020-11-18 10:24 UTC (permalink / raw)
To: gcc-patches
This makes vectorization properly assign vector types to PHI
nodes that copy from externals on loop exit edges.
Bootstrapped and tested on x86_64-unknown-linux-gnu, pushed.
2020-11-18 Richard Biener <rguenther@suse.de>
PR tree-optimization/97886
* tree-vect-loop.c (vectorizable_lc_phi): Properly assign
vector types to invariants for SLP.
---
gcc/tree-vect-loop.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/gcc/tree-vect-loop.c b/gcc/tree-vect-loop.c
index ecaaf0116d3..856bbfebf7c 100644
--- a/gcc/tree-vect-loop.c
+++ b/gcc/tree-vect-loop.c
@@ -7593,6 +7593,17 @@ vectorizable_lc_phi (loop_vec_info loop_vinfo,
if (!vec_stmt) /* transformation not required. */
{
+ /* Deal with copies from externs or constants that disguise as
+ loop-closed PHI nodes (PR97886). */
+ if (slp_node
+ && !vect_maybe_update_slp_op_vectype (SLP_TREE_CHILDREN (slp_node)[0],
+ SLP_TREE_VECTYPE (slp_node)))
+ {
+ if (dump_enabled_p ())
+ dump_printf_loc (MSG_MISSED_OPTIMIZATION, vect_location,
+ "incompatible vector types for invariants\n");
+ return false;
+ }
STMT_VINFO_TYPE (stmt_info) = lc_phi_info_type;
return true;
}
--
2.26.2
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