From: Jakub Jelinek <jakub@redhat.com>
Date: Mon, 25 Jun 2018 17:48:47 +0000 (+0200)
Subject: backport: re PR rtl-optimization/85431 (UBSAN: ../../gcc/dse.c:303:15: runtime error... 
X-Git-Tag: releases/gcc-6.5.0~188
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=eed2feb30e5072ce4e7f432fbbbf2f3175bbb21a;p=thirdparty%2Fgcc.git

backport: re PR rtl-optimization/85431 (UBSAN: ../../gcc/dse.c:303:15: runtime error: shift exponent 64 is too large for 64-bit type 'long unsigned int')

	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 c204f20647ab..6bafb746d894 100644
--- 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 48046ca46485..4eddcd1cf2af 100644
--- 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