From: Richard Biener <rguenther@suse.de>
Date: Mon, 12 Oct 2020 07:31:16 +0000 (+0200)
Subject: More consistently split SLP groups
X-Git-Tag: upstream/12.2.0~13144
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=6d42d1e223deaf866062e11bd51ee99441ad8871;p=platform%2Fupstream%2Fgcc.git

More consistently split SLP groups

This appropriately makes matches all true after successful SLP discovery
to reliably succeed splitting.  We were picking up an eventual all
false built-up from scalars state in some cases.

2020-10-12  Richard Biener  <rguenther@suse.de>

	* tree-vect-slp.c (vect_analyze_slp_instance): Set matches to true
	after successful discovery but forced split.
---

diff --git a/gcc/tree-vect-slp.c b/gcc/tree-vect-slp.c
index 495fb97..dd2042a 100644
--- a/gcc/tree-vect-slp.c
+++ b/gcc/tree-vect-slp.c
@@ -2283,7 +2283,7 @@ vect_analyze_slp_instance (vec_info *vinfo,
 	    dump_printf_loc (MSG_NOTE, vect_location,
 			     "SLP discovery succeeded but node needs "
 			     "splitting\n");
-	  matches[0] = true;
+	  memset (matches, true, group_size);
 	  matches[group_size / const_max_nunits * const_max_nunits] = false;
 	  vect_free_slp_tree (node);
 	}