[PATCH, middle-end/82577] Fix DECL_ASSEMBLER_NAME ICE

https://gcc.gnu.org/ml/gcc-patches/2017-10/msg01067.html
	gcc/
	PR middle-end/82577
	* alias.c (compare_base_decls): Check HAS_DECL_ASSEMBLER_NAME_P,
	use DECL_ASSEMBLER_NAME_RAW.

	gcc/testsuite/
	PR middle-end/82577
	* g++.dg/opt/pr82577.C: New.

From-SVN: r253819

gcc/ChangeLog

 2017-10-17  Nathan Sidwell  <nathan@acm.org>
 
+	PR middle-end/82577
+	* alias.c (compare_base_decls): Check HAS_DECL_ASSEMBLER_NAME_P,
+	use DECL_ASSEMBLER_NAME_RAW.
+
 	PR middle-end/82546
 	* tree.c (tree_code_size): Reformat.  Punt to lang hook for unknown
 	TYPE nodes.

gcc/alias.c

@@ -2047,13 +2047,15 @@ compare_base_decls (tree base1, tree base2)
     return 1;
 
   /* If we have two register decls with register specification we
-     cannot decide unless their assembler name is the same.  */
+     cannot decide unless their assembler names are the same.  */
   if (DECL_REGISTER (base1)
       && DECL_REGISTER (base2)
+      && HAS_DECL_ASSEMBLER_NAME_P (base1)
+      && HAS_DECL_ASSEMBLER_NAME_P (base2)
       && DECL_ASSEMBLER_NAME_SET_P (base1)
       && DECL_ASSEMBLER_NAME_SET_P (base2))
     {
-      if (DECL_ASSEMBLER_NAME (base1) == DECL_ASSEMBLER_NAME (base2))
+      if (DECL_ASSEMBLER_NAME_RAW (base1) == DECL_ASSEMBLER_NAME_RAW (base2))
 	return 1;
       return -1;
     }

gcc/testsuite/ChangeLog

+2017-10-17  Nathan Sidwell  <nathan@acm.org>
+
+	PR middle-end/82577
+	* g++.dg/opt/pr82577.C: New.
+
 2017-10-17  Qing Zhao <qing.zhao@oracle.com>
 	    Wilco Dijkstra <wilco.dijkstra@arm.com>
 

gcc/testsuite/g++.dg/opt/pr82577.C

+// { dg-additional-options "-O2" }
+// PR c++/82577 ICE when optimizing
+
+class a {
+public:
+  int *b();
+};
+struct c {
+  int d;
+  a e;
+} f;
+void fn1(register c *g) {
+  register int *h;
+  do
+    (h) = g->e.b() + (g)->d;
+  while (&f);
+}