re PR c++/90810 (Different intrinsics behavior on G++ 7.4 and G++ 8.3)

	PR c++/90810
	* init.c (constant_value_1): Handle VECTOR_CST DECL_INITIAL for
	!DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P decls like CONSTRUCTOR.

	* g++.dg/ext/vector37.C: New test.

From-SVN: r272152

gcc/cp/ChangeLog

+2019-06-11  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c++/90810
+	* init.c (constant_value_1): Handle VECTOR_CST DECL_INITIAL for
+	!DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P decls like CONSTRUCTOR.
+
 2019-06-11  Martin Liska  <mliska@suse.cz>
 
 	PR c++/87847

gcc/cp/init.c

@@ -2339,8 +2339,11 @@ constant_value_1 (tree decl, bool strict_p, bool return_aggregate_cst_ok_p)
 		  || TREE_CODE (init) == STRING_CST)))
 	break;
       /* Don't return a CONSTRUCTOR for a variable with partial run-time
-	 initialization, since it doesn't represent the entire value.  */
-      if (TREE_CODE (init) == CONSTRUCTOR
+	 initialization, since it doesn't represent the entire value.
+	 Similarly for VECTOR_CSTs created by cp_folding those
+	 CONSTRUCTORs.  */
+      if ((TREE_CODE (init) == CONSTRUCTOR
+	   || TREE_CODE (init) == VECTOR_CST)
 	  && !DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl))
 	break;
       /* If the variable has a dynamic initializer, don't use its

gcc/testsuite/ChangeLog

+2019-06-11  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c++/90810
+	* g++.dg/ext/vector37.C: New test.
+
 2019-06-10  Matthew Beliveau  <mbelivea@redhat.com>
 
 	PR c++/87250

gcc/testsuite/g++.dg/ext/vector37.C

+// PR c++/90810
+// { dg-do run }
+
+void
+foo (float x, float y)
+{
+  typedef float __attribute__ ((__vector_size__ (4 * sizeof (float)), __may_alias__)) V;
+  const V a = { x, x, x, x }, b = { y, y, y, y };
+  const V c = a / b;
+  if (c[0] != 6.0f || c[1] != 6.0f || c[2] != 6.0f || c[3] != 6.0f)
+    __builtin_abort ();
+}
+
+void
+bar (float y)
+{
+  typedef float __attribute__ ((__vector_size__ (4 * sizeof (float)), __may_alias__)) V;
+  const V a = { 7.0f, 8.0f, 9.0f, 10.0f }, b = { 1.0f, 2.0f, 3.0f, y };
+  const V c = a / b;
+  if (c[0] != 7.0f || c[1] != 4.0f || c[2] != 3.0f || c[3] != 5.0f)
+    __builtin_abort ();
+}
+
+int
+main ()
+{
+  foo (12.0f, 2.0f);
+  bar (2.0f);
+}