[PATCH] tree-optimization/101112 - fix pattern stmt def lookup in SLP reassoc

[Richard Biener]

This fixes the lookup of a pattern stmt def operand.

Bootstrapped and tested on x86_64-unknown-linux-gnu, pushed.

2021-06-18  Richard Biener  <rguent...@suse.de>

        PR tree-optimization/101112
        * tree-vect-slp.c (vect_slp_linearize_chain): Fix condition
        to lookup a pattern stmt def.
---
 gcc/tree-vect-slp.c | 10 +++-------
 1 file changed, 3 insertions(+), 7 deletions(-)

diff --git a/gcc/tree-vect-slp.c b/gcc/tree-vect-slp.c
index 0c1f85beeb2..f9c33c0bb14 100644
--- a/gcc/tree-vect-slp.c
+++ b/gcc/tree-vect-slp.c
@@ -1482,13 +1482,9 @@ vect_slp_linearize_chain (vec_info *vinfo,
          stmt_vec_info def_stmt_info;
          bool res = vect_is_simple_use (op, vinfo, &dt, &def_stmt_info);
          gcc_assert (res);
-         if (dt == vect_internal_def)
-           {
-             stmt_vec_info orig_def_stmt_info = def_stmt_info;
-             def_stmt_info = vect_stmt_to_vectorize (def_stmt_info);
-             if (def_stmt_info != orig_def_stmt_info)
-               op = gimple_get_lhs (def_stmt_info->stmt);
-           }
+         if (dt == vect_internal_def
+             && is_pattern_stmt_p (def_stmt_info))
+           op = gimple_get_lhs (def_stmt_info->stmt);
          gimple *use_stmt;
          use_operand_p use_p;
          if (dt == vect_internal_def
-- 
2.26.2