operand scanner TLC

This applies some TLC to mark_address_taken which ends up setting
TREE_ADDRESSABLE on nodes where it doesn't have any semantics.
It also does work (incomplete) that get_base_address already does,
likewise we'll never get WITH_SIZE_EXPR in this context and thus
get_base_address never fails.

2021-05-18  Richard Biener  <rguenther@suse.de>

	* tree-ssa-operands.c (mark_address_taken): Simplify.

diff --git a/gcc/tree-ssa-operands.c b/gcc/tree-ssa-operands.c
index 9e62088..2fc74d5 100644 (file)
--- a/gcc/tree-ssa-operands.c
+++ b/gcc/tree-ssa-operands.c
@@ -626,15 +626,10 @@ mark_address_taken (tree ref)
      be referenced using pointer arithmetic.  See PR 21407 and the
      ensuing mailing list discussion.  */
   var = get_base_address (ref);
-  if (var)
-    {
-      if (DECL_P (var))
-       TREE_ADDRESSABLE (var) = 1;
-      else if (TREE_CODE (var) == MEM_REF
-              && TREE_CODE (TREE_OPERAND (var, 0)) == ADDR_EXPR
-              && DECL_P (TREE_OPERAND (TREE_OPERAND (var, 0), 0)))
-       TREE_ADDRESSABLE (TREE_OPERAND (TREE_OPERAND (var, 0), 0)) = 1;
-    }
+  if (VAR_P (var)
+      || TREE_CODE (var) == RESULT_DECL
+      || TREE_CODE (var) == PARM_DECL)
+    TREE_ADDRESSABLE (var) = 1;
 }