PR c++/91545 - ICE in constexpr store evaluation.

	* constexpr.c (cxx_eval_store_expression): Check FIELD_DECL instead
	of DECL_P.

	* g++.dg/cpp0x/pr91545.C: New test.

From-SVN: r274930

gcc/cp/ChangeLog

+2019-08-26  Marek Polacek  <polacek@redhat.com>
+
+	PR c++/91545 - ICE in constexpr store evaluation.
+	* constexpr.c (cxx_eval_store_expression): Check FIELD_DECL instead
+	of DECL_P.
+
 2019-08-24  Nathan Sidwell  <nathan@acm.org>
 
 	* class.c (check_for_overrides): Conversion operators need

gcc/cp/constexpr.c

@@ -3849,7 +3849,7 @@ cxx_eval_store_expression (const constexpr_ctx *ctx, tree t,
 	  {
 	    tree ob = TREE_OPERAND (probe, 0);
 	    tree elt = TREE_OPERAND (probe, 1);
-	    if (DECL_P (elt) && DECL_MUTABLE_P (elt))
+	    if (TREE_CODE (elt) == FIELD_DECL && DECL_MUTABLE_P (elt))
 	      mutable_p = true;
 	    if (evaluated
 		&& modifying_const_object_p (TREE_CODE (t), probe, mutable_p)

gcc/testsuite/ChangeLog

+2019-08-26  Marek Polacek  <polacek@redhat.com>
+
+	PR c++/91545 - ICE in constexpr store evaluation.
+	* g++.dg/cpp0x/pr91545.C: New test.
+
 2019-08-26  Tejas Joshi  <tejasjoshi9673@gmail.com>
 
 	* gcc.target/i386/sse4_1-round-roundeven-1.c: New test.

gcc/testsuite/g++.dg/cpp0x/pr91545.C

+// PR c++/91545
+// { dg-do compile { target c++11 } }
+
+long a[1];
+int d, e { d && (a[d] = 0) };