re PR tree-optimization/87117 (ICE in…

re PR tree-optimization/87117 (ICE in eliminate_dom_walker::eliminate_cleanup(bool) at gcc/gcc/tree-ssa-sccvn.c:5431 since r263875)

2018-08-28  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/87117
	* tree-ssa-operands.c (add_stmt_operand): STRING_CST may
	get virtual operands.
	(get_expr_operands): Handle STRING_CST like other decls.

	* gcc.dg/lvalue-5.c: New testcase.

From-SVN: r263908

gcc/ChangeLog

+2018-08-28  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/87117
+	* tree-ssa-operands.c (add_stmt_operand): STRING_CST may
+	get virtual operands.
+	(get_expr_operands): Handle STRING_CST like other decls.
+
 2018-08-28  Martin Liska  <mliska@suse.cz>
 
 	* tree.h: Update documentation of fndecl_built_in_p

gcc/testsuite/ChangeLog

+2018-08-28  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/87117
+	* gcc.dg/lvalue-5.c: New testcase.
+
 2018-08-27  Jeff Law  <law@redhat.com>
 
 	PR tree-optimization/87110

gcc/testsuite/gcc.dg/lvalue-5.c

 /* Test assignment to elements of a string literal is a warning, not
    an error.  PR 27676.  */
 /* { dg-do compile } */
-/* { dg-options "-pedantic-errors" } */
+/* { dg-options "-O -pedantic-errors" } */
 
 void
 f (void)

gcc/tree-ssa-operands.c

@@ -515,7 +515,7 @@ add_stmt_operand (struct function *fn, tree *var_p, gimple *stmt, int flags)
 {
   tree var = *var_p;
 
-  gcc_assert (SSA_VAR_P (*var_p));
+  gcc_assert (SSA_VAR_P (*var_p) || TREE_CODE (*var_p) == STRING_CST);
 
   if (is_gimple_reg (var))
     {
@@ -740,6 +740,7 @@ get_expr_operands (struct function *fn, gimple *stmt, tree *expr_p, int flags)
     case VAR_DECL:
     case PARM_DECL:
     case RESULT_DECL:
+    case STRING_CST:
       if (!(flags & opf_address_taken))
 	add_stmt_operand (fn, expr_p, stmt, flags);
       return;