re PR rtl-optimization/77919 (ICE converting DC to V2DF mode)

	PR rtl-optimization/77919
	* expr.c (expand_expr_real_1) <normal_inner_ref>: Force CONCAT into
	MEM if mode1 is not a complex mode.

	* g++.dg/torture/pr77919.C: New test.

From-SVN: r241642

gcc/ChangeLog

 2016-10-28  Jakub Jelinek  <jakub@redhat.com>
 
+	PR rtl-optimization/77919
+	* expr.c (expand_expr_real_1) <normal_inner_ref>: Force CONCAT into
+	MEM if mode1 is not a complex mode.
+
 	PR rtl-optimization/78132
 	* ree.c (combine_reaching_defs): Give up if copy_needed and
 	!HARD_REGNO_MODE_OK (REGNO (src_reg), dst_mode).

gcc/expr.c

@@ -10421,7 +10421,8 @@ expand_expr_real_1 (tree exp, rtx target, machine_mode tmode,
 	if (GET_CODE (op0) == CONCAT && !must_force_mem)
 	  {
 	    if (bitpos == 0
-		&& bitsize == GET_MODE_BITSIZE (GET_MODE (op0)))
+		&& bitsize == GET_MODE_BITSIZE (GET_MODE (op0))
+		&& COMPLEX_MODE_P (mode1))
 	      {
 		if (reversep)
 		  op0 = flip_storage_order (GET_MODE (op0), op0);

gcc/testsuite/ChangeLog

 2016-10-28  Jakub Jelinek  <jakub@redhat.com>
 
+	PR rtl-optimization/77919
+	* g++.dg/torture/pr77919.C: New test.
+
 	PR rtl-optimization/78132
 	* gcc.target/i386/pr78132.c: New test.
 

gcc/testsuite/g++.dg/torture/pr77919.C

+// PR rtl-optimization/77919
+// { dg-do compile }
+// { dg-additional-options "-Wno-psabi" }
+
+struct A { A (double) {} _Complex double i; };
+typedef int __attribute__ ((vector_size (16))) B;
+typedef struct { B b; } C;
+struct D { D (const B &x) : b (x) {} B b; };
+static inline B foo (const double *x) { C *a; a = (C *) x; return a->b; }
+static inline D baz (const A &x) { return foo ((double *) &x); }
+D b = baz (0);