Add missing VECTOR_MODE_P checks (PR 92595)

This patch fixes some cases in which we weren't checking whether we had
a vector mode before calling related_vector_mode or before making vector
optab queries.

2019-11-21  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
	PR tree-optimization/92595
	* tree-vect-stmts.c (get_group_load_store_type): Add a VECTOR_MODE_P
	check.
	(vectorizable_store, vectorizable_load): Likewise.

gcc/testsuite/
	PR tree-optimization/92595
	* g++.dg/vect/pr92595.cc: New test.

From-SVN: r278590

gcc/ChangeLog

+2019-11-21  Richard Sandiford  <richard.sandiford@arm.com>
+
+	PR tree-optimization/92595
+	* tree-vect-stmts.c (get_group_load_store_type): Add a VECTOR_MODE_P
+	check.
+	(vectorizable_store, vectorizable_load): Likewise.
+
 2019-11-21  Jan Hubicka  <jh@suse.cz>
 
 	* ipa-inline.c (update_callee_keys): Add parameter UPDATE_SINCE.

gcc/testsuite/ChangeLog

+2019-11-21  Richard Sandiford  <richard.sandiford@arm.com>
+
+	PR tree-optimization/92595
+	* g++.dg/vect/pr92595.cc: New test.
+
 2019-11-21  Srinath Parvathaneni  <srinath.parvathaneni@arm.com>
 
 	* gcc.target/arm/acle/crc_hf_1.c: Modify the compiler options directive

gcc/testsuite/g++.dg/vect/pr92595.cc

+// { dg-do compile }
+// { dg-require-effective-target c++11 }
+// { dg-additional-options "-O3" }
+// { dg-additional-options "-O3 -m32 -mno-sse" { target { i?86-*-* x86_64-*-* } } }
+
+void *operator new(__SIZE_TYPE__, void *a) { return a; }
+class b {
+public:
+  using c = int *;
+  c e();
+  c h();
+};
+template <typename d> class j : b {
+public:
+  void l() {
+    for (auto f = h(), g = e(); f != g; ++f)
+      new (f) d();
+  }
+};
+class m {
+public:
+  enum i {};
+  struct C {
+    i : 8;
+    i k : 8;
+  };
+};
+class o {
+  j<m::C> n;
+  o();
+};
+o::o() { n.l(); }

gcc/tree-vect-stmts.c

@@ -2308,6 +2308,7 @@ get_group_load_store_type (stmt_vec_info stmt_info, tree vectype, bool slp,
 		  || alignment_support_scheme == dr_unaligned_supported)
 	      && known_eq (nunits, (group_size - gap) * 2)
 	      && known_eq (nunits, group_size)
+	      && VECTOR_MODE_P (TYPE_MODE (vectype))
 	      && related_vector_mode (TYPE_MODE (vectype), elmode,
 				      group_size - gap).exists (&vmode)
 	      && (convert_optab_handler (vec_init_optab,
@@ -7822,8 +7823,9 @@ vectorizable_store (stmt_vec_info stmt_info, gimple_stmt_iterator *gsi,
 		 of vector elts directly.  */
 	      scalar_mode elmode = SCALAR_TYPE_MODE (elem_type);
 	      machine_mode vmode;
-	      if (!related_vector_mode (TYPE_MODE (vectype), elmode,
-					group_size).exists (&vmode)
+	      if (!VECTOR_MODE_P (TYPE_MODE (vectype))
+		  || !related_vector_mode (TYPE_MODE (vectype), elmode,
+					   group_size).exists (&vmode)
 		  || (convert_optab_handler (vec_extract_optab,
 					     TYPE_MODE (vectype), vmode)
 		      == CODE_FOR_nothing))
@@ -7840,6 +7842,7 @@ vectorizable_store (stmt_vec_info stmt_info, gimple_stmt_iterator *gsi,
 		     element extracts from the original vector type and
 		     element size stores.  */
 		  if (int_mode_for_size (lsize, 0).exists (&elmode)
+		      && VECTOR_MODE_P (TYPE_MODE (vectype))
 		      && related_vector_mode (TYPE_MODE (vectype), elmode,
 					      lnunits).exists (&vmode)
 		      && (convert_optab_handler (vec_extract_optab,
@@ -8922,8 +8925,9 @@ vectorizable_load (stmt_vec_info stmt_info, gimple_stmt_iterator *gsi,
 		 vector elts directly.  */
 	      scalar_mode elmode = SCALAR_TYPE_MODE (TREE_TYPE (vectype));
 	      machine_mode vmode;
-	      if (related_vector_mode (TYPE_MODE (vectype), elmode,
-				       group_size).exists (&vmode)
+	      if (VECTOR_MODE_P (TYPE_MODE (vectype))
+		  && related_vector_mode (TYPE_MODE (vectype), elmode,
+					  group_size).exists (&vmode)
 		  && (convert_optab_handler (vec_init_optab,
 					     TYPE_MODE (vectype), vmode)
 		      != CODE_FOR_nothing))
@@ -8947,6 +8951,7 @@ vectorizable_load (stmt_vec_info stmt_info, gimple_stmt_iterator *gsi,
 		  /* If we can't construct such a vector fall back to
 		     element loads of the original vector type.  */
 		  if (int_mode_for_size (lsize, 0).exists (&elmode)
+		      && VECTOR_MODE_P (TYPE_MODE (vectype))
 		      && related_vector_mode (TYPE_MODE (vectype), elmode,
 					      lnunits).exists (&vmode)
 		      && (convert_optab_handler (vec_init_optab, vmode, elmode)