From: Jakub Jelinek <jakub@redhat.com>
Date: Fri, 22 Jun 2018 21:11:28 +0000 (+0200)
Subject: backport: re PR rtl-optimization/85431 (UBSAN: ../../gcc/dse.c:303:15: runtime error... 
X-Git-Tag: releases/gcc-7.4.0~334
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=50f8ab99c8a05a9cf2fa7a50d475623c50123903;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: r261955
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 52232caf7a14..6be713635848 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -3,6 +3,9 @@
 	Backported from mainline
 	2018-04-17  Jakub Jelinek  <jakub@redhat.com>
 
+	PR rtl-optimization/85431
+	* dse.c (record_store): Ignore zero width stores.
+
 	PR target/85430
 	* config/i386/i386.md (*ashlqi3_1_slp): Use alu1 type instead of alu.
 
diff --git a/gcc/dse.c b/gcc/dse.c
index f87dd50024e8..174865bbc40b 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