2019-09-01  Bernd Edlinger  <bernd.edlinger@hotmail.de>

	PR middle-end/91605
	* expr.c (expand_assignment): Avoid DECL_P with DECL_RTL
	not being MEM_P.

testsuite:
2019-09-01  Bernd Edlinger  <bernd.edlinger@hotmail.de>

	PR middle-end/91605
	* g++.target/i386/pr91605.C: New test.

Index: gcc/expr.c
===================================================================
--- gcc/expr.c	(revision 275063)
+++ gcc/expr.c	(working copy)
@@ -5004,7 +5004,8 @@ expand_assignment (tree to, tree from, bool nontem
        || TREE_CODE (to) == TARGET_MEM_REF
        || DECL_P (to))
       && mode != BLKmode
-      && (DECL_P (to) || !mem_ref_refers_to_non_mem_p (to))
+      && (DECL_P (to) ? MEM_P (DECL_RTL (to))
+		      : !mem_ref_refers_to_non_mem_p (to))
       && ((align = get_object_alignment (to))
 	  < GET_MODE_ALIGNMENT (mode))
       && (((icode = optab_handler (movmisalign_optab, mode))
Index: gcc/testsuite/g++.target/i386/pr91605.C
===================================================================
--- gcc/testsuite/g++.target/i386/pr91605.C	(revision 0)
+++ gcc/testsuite/g++.target/i386/pr91605.C	(working copy)
@@ -0,0 +1,13 @@
+/* { dg-do compile } */
+/* { dg-options "-fpack-struct -mavx" } */
+
+struct A {
+  __attribute__((__vector_size__(4 * sizeof(double)))) double data;
+};
+struct B {
+  A operator*(B);
+};
+void fn1() {
+  B x, y;
+  x *y;
+}