From e9d322ced1433da8e7c69243cfa941ea462d6290 Mon Sep 17 00:00:00 2001 From: Richard Biener Date: Fri, 11 Jun 2021 08:04:41 +0200 Subject: [PATCH] Use stablesort for sorting association chain This should preserve the original association order as much as possible for the initial SLP discovery attempt and also improve consistency. 2021-06-11 Richard Biener * tree-vect-slp.c (vect_build_slp_tree_2): Use stablesort to sort operands of the associative chain. --- gcc/tree-vect-slp.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/gcc/tree-vect-slp.c b/gcc/tree-vect-slp.c index c4f8f38..6237a61 100644 --- a/gcc/tree-vect-slp.c +++ b/gcc/tree-vect-slp.c @@ -1865,7 +1865,7 @@ vect_build_slp_tree_2 (vec_info *vinfo, slp_tree node, /* Now we have a set of chains with the same length. */ /* 1. pre-sort according to def_type and operation. */ for (unsigned lane = 0; lane < group_size; ++lane) - chains[lane].sort (dt_sort_cmp, vinfo); + chains[lane].stablesort (dt_sort_cmp, vinfo); if (dump_enabled_p ()) { dump_printf_loc (MSG_NOTE, vect_location, -- 2.7.4