backport: re PR rtl-optimization/85431 (UBSAN: ../../gcc/dse.c:303:15: runtime error...

	Backported from mainline
	2018-04-17  Jakub Jelinek  <jakub@redhat.com>

	PR rtl-optimization/85431
	* dse.c (record_store): Ignore zero width stores.

From-SVN: r262097

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index c204f20647ab7ce3a22c915aa2e7c3b5d133bd5f..6bafb746d894a50fee15281ba20f884b20c270ef 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,6 +1,11 @@
 2018-06-25  Jakub Jelinek  <jakub@redhat.com>
 
        Backported from mainline
+       2018-04-17  Jakub Jelinek  <jakub@redhat.com>
+
+       PR rtl-optimization/85431
+       * dse.c (record_store): Ignore zero width stores.
+
        2018-04-10  Jakub Jelinek  <jakub@redhat.com>
 
        PR rtl-optimization/85300

diff --git a/gcc/dse.c b/gcc/dse.c
index 48046ca46485eca9d265d90aed1e93150cf48a45..4eddcd1cf2afd38650a5cef02bf51a0a0365a5c1 100644 (file)
--- a/gcc/dse.c
+++ b/gcc/dse.c
@@ -1342,6 +1342,9 @@ record_store (rtx body, bb_info_t bb_info)
   else
     width = GET_MODE_SIZE (GET_MODE (mem));
 
+  if (width == 0)
+    return 0;
+
   if (group_id >= 0)
     {
       /* In the restrictive case where the base is a constant or the