re PR middle-end/67271 (ICE with -O1,2,3 on darwin14.5 x86_64)

2015-09-16  Richard Biener  <rguenther@suse.de>

	PR middle-end/67271
	* fold-const.c (native_encode_expr): Bail out on bogus offsets.

	* gcc.dg/pr67271.c: New testcase.

From-SVN: r227825

gcc/ChangeLog

+2015-09-16  Richard Biener  <rguenther@suse.de>
+
+	PR middle-end/67271
+	* fold-const.c (native_encode_expr): Bail out on bogus offsets.
+
 2015-09-16  Eric Botcazou  <ebotcazou@adacore.com>
 
 	* tree-ssa-sccvn.c (ao_ref_init_from_vn_reference): Use offset_int for

gcc/fold-const.c

@@ -7110,6 +7110,10 @@ native_encode_string (const_tree expr, unsigned char *ptr, int len, int off)
 int
 native_encode_expr (const_tree expr, unsigned char *ptr, int len, int off)
 {
+  /* We don't support starting at negative offset and -1 is special.  */
+  if (off < -1)
+    return 0;
+
   switch (TREE_CODE (expr))
     {
     case INTEGER_CST:

gcc/testsuite/ChangeLog

+2015-09-16  Richard Biener  <rguenther@suse.de>
+
+	PR middle-end/67271
+	* gcc.dg/pr67271.c: New testcase.
+
 2015-09-16  Eric Botcazou  <ebotcazou@adacore.com>
 
 	* gnat.dg/opt49.adb: New test.

gcc/testsuite/gcc.dg/pr67271.c

+/* { dg-do compile } */
+/* { dg-options "-O" } */
+
+extern long int labs (long int j);
+int
+main ()
+{
+  long *a = (long *)"empty";
+  int i = 1441516387;
+  a[i] = labs (a[i]);
+  return 0;
+}