From: Marek Polacek <polacek@redhat.com>
Date: Fri, 17 Jan 2014 14:51:56 +0000 (+0000)
Subject: re PR c/58346 (ICE with SIGFPE at -O1 and above on x86_64-linux-gnu (affecting trunk... 
X-Git-Tag: releases/gcc-4.9.0~1607
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=30078c0a6521519cd18090edb554c62e8d9c1a8a;p=thirdparty%2Fgcc.git

re PR c/58346 (ICE with SIGFPE at -O1 and above on x86_64-linux-gnu (affecting trunk, 4.8, 4.7, and 4.6))

	PR c/58346
	* gimple-fold.c (fold_array_ctor_reference): Don't fold if element
	size is zero.
testsuite/
	* gcc.dg/pr58346.c: New test.

From-SVN: r206715
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 870d23233faf..21b597144f47 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2014-01-17  Marek Polacek  <polacek@redhat.com>
+
+	PR c/58346
+	* gimple-fold.c (fold_array_ctor_reference): Don't fold if element
+	size is zero.
+
 2014-01-17  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/46590
diff --git a/gcc/gimple-fold.c b/gcc/gimple-fold.c
index 5dc27e172d92..bace6f892d2e 100644
--- a/gcc/gimple-fold.c
+++ b/gcc/gimple-fold.c
@@ -2940,7 +2940,8 @@ fold_array_ctor_reference (tree type, tree ctor,
      be larger than size of array element.  */
   if (!TYPE_SIZE_UNIT (type)
       || TREE_CODE (TYPE_SIZE_UNIT (type)) != INTEGER_CST
-      || elt_size.slt (tree_to_double_int (TYPE_SIZE_UNIT (type))))
+      || elt_size.slt (tree_to_double_int (TYPE_SIZE_UNIT (type)))
+      || elt_size.is_zero ())
     return NULL_TREE;
 
   /* Compute the array index we look for.  */
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index d8b972b86622..a78e915bf780 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2014-01-17  Marek Polacek  <polacek@redhat.com>
+
+	PR c/58346
+	* gcc.dg/pr58346.c: New test.
+
 2014-01-17  Jakub Jelinek  <jakub@redhat.com>
 
 	PR testsuite/58776
diff --git a/gcc/testsuite/gcc.dg/pr58346.c b/gcc/testsuite/gcc.dg/pr58346.c
new file mode 100644
index 000000000000..b7940f6cf4d3
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr58346.c
@@ -0,0 +1,19 @@
+/* PR tree-optimization/58346 */
+/* { dg-do compile } */
+/* { dg-options "-O" } */
+
+struct U {};
+static struct U b[1] = { };
+extern void bar (struct U);
+
+void
+foo (void)
+{
+  bar (b[0]);
+}
+
+void
+baz (void)
+{
+  foo ();
+}