re PR rtl-optimization/49429 (dse.c change (r175063) causes execution failures)

	PR rtl-optimization/49429
	PR target/49454
	PR rtl-optimization/86334
	PR target/88906
	* expr.c (emit_block_move_hints): Move marking of MEM_EXPRs
	addressable from here...
	(emit_block_op_via_libcall): ... to here.

	* gcc.target/i386/pr86334.c: New test.
	* gcc.target/i386/pr88906.c: New test.

From-SVN: r268138

gcc/ChangeLog

+2019-01-22  Jakub Jelinek  <jakub@redhat.com>
+
+	PR rtl-optimization/49429
+	PR target/49454
+	PR rtl-optimization/86334
+	PR target/88906
+	* expr.c (emit_block_move_hints): Move marking of MEM_EXPRs
+	addressable from here...
+	(emit_block_op_via_libcall): ... to here.
+
 2019-01-22  Richard Biener  <rguenther@suse.de>
 
 	* tree-vect-loop.c (vect_analyze_loop_operations): Use

gcc/expr.c

@@ -1631,14 +1631,6 @@ emit_block_move_hints (rtx x, rtx y, rtx size, enum block_op_methods method,
       if (may_use_call < 0)
 	return pc_rtx;
 
-      /* Since x and y are passed to a libcall, mark the corresponding
-	 tree EXPR as addressable.  */
-      tree y_expr = MEM_EXPR (y);
-      tree x_expr = MEM_EXPR (x);
-      if (y_expr)
-	mark_addressable (y_expr);
-      if (x_expr)
-	mark_addressable (x_expr);
       retval = emit_block_copy_via_libcall (x, y, size,
 					    method == BLOCK_OP_TAILCALL);
     }
@@ -1884,6 +1876,15 @@ emit_block_op_via_libcall (enum built_in_function fncode, rtx dst, rtx src,
   tree call_expr, dst_tree, src_tree, size_tree;
   machine_mode size_mode;
 
+  /* Since dst and src are passed to a libcall, mark the corresponding
+     tree EXPR as addressable.  */
+  tree dst_expr = MEM_EXPR (dst);
+  tree src_expr = MEM_EXPR (src);
+  if (dst_expr)
+    mark_addressable (dst_expr);
+  if (src_expr)
+    mark_addressable (src_expr);
+
   dst_addr = copy_addr_to_reg (XEXP (dst, 0));
   dst_addr = convert_memory_address (ptr_mode, dst_addr);
   dst_tree = make_tree (ptr_type_node, dst_addr);

gcc/testsuite/ChangeLog

+2019-01-22  Jakub Jelinek  <jakub@redhat.com>
+
+	PR rtl-optimization/49429
+	PR target/49454
+	PR rtl-optimization/86334
+	PR target/88906
+	* gcc.target/i386/pr86334.c: New test.
+	* gcc.target/i386/pr88906.c: New test.
+
 2019-01-21  Jakub Jelinek  <jakub@redhat.com>
 
 	PR c++/88949

gcc/testsuite/gcc.target/i386/pr86334.c

+/* PR rtl-optimization/86334 */
+/* { dg-do run { target ia32 } } */
+/* { dg-options "-O -march=i386 -mtune=athlon -minline-all-stringops -minline-stringops-dynamically -mmemcpy-strategy=libcall:-1:align -Wno-psabi" } */
+
+typedef int V __attribute__ ((vector_size (64)));
+
+static inline V
+foo (V g)
+{
+  g[0] = 4;
+  return g;
+}
+
+int
+main ()
+{
+  V x = foo ((V) { });
+  if (x[0] != 4 || x[1] || x[2] || x[3] || x[4] || x[5] || x[6] || x[7])
+    __builtin_abort ();
+  return 0;
+}

gcc/testsuite/gcc.target/i386/pr88906.c

+/* PR target/88906 */
+/* { dg-do run { target ia32 } } */
+/* { dg-options "-O -march=i386 -mtune=k6 -minline-all-stringops -minline-stringops-dynamically -mmemcpy-strategy=libcall:-1:align -Wno-psabi" } */
+
+typedef unsigned V __attribute__ ((vector_size (16)));
+
+static inline V
+foo (V v)
+{
+  __builtin_sub_overflow (0, 0, &v[0]);
+  return v;
+}
+
+int
+main ()
+{
+  V v = foo ((V) { ~0 });
+  if (v[0] || v[1] || v[2] || v[3])
+    __builtin_abort ();
+  return 0;
+}