PR middle-end/35136

	* gimplify.c (force_gimple_operand_bsi): Revert 2008-02-12 change.
	(force_gimple_operand): Likewise.
	* tree-ssa-loop-ivopts.c (may_be_nonaddressable_p): Add new cases
	for TARGET_MEM_REF and CONVERT_EXPR/NON_LVALUE_EXPR/NOP_EXPR.
	Also recurse on the operand for regular VIEW_CONVERT_EXPRs.
	(find_interesting_uses_address): Check addressability and alignment
	of the base expression only after substituting bases of IVs into it.



git-svn-id: https://gcc.gnu.org/svn/gcc/trunk@132320 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 29 insertions, 13 deletions

diff --git a/gcc/tree-ssa-loop-ivopts.c b/gcc/tree-ssa-loop-ivopts.c
index ef7d64a268d..6ff690dfaa9 100644
--- a/gcc/tree-ssa-loop-ivopts.c
+++ b/gcc/tree-ssa-loop-ivopts.c
@@ -1434,21 +1434,34 @@ may_be_nonaddressable_p (tree expr)
 {
   switch (TREE_CODE (expr))
     {
+    case TARGET_MEM_REF:
+      /* TARGET_MEM_REFs are translated directly to valid MEMs on the
+	 target, thus they are always addressable.  */
+      return false;
+
     case COMPONENT_REF:
       return DECL_NONADDRESSABLE_P (TREE_OPERAND (expr, 1))
 	     || may_be_nonaddressable_p (TREE_OPERAND (expr, 0));
 
-    case ARRAY_REF:
-    case ARRAY_RANGE_REF:
-      return may_be_nonaddressable_p (TREE_OPERAND (expr, 0));
-
     case VIEW_CONVERT_EXPR:
       /* This kind of view-conversions may wrap non-addressable objects
 	 and make them look addressable.  After some processing the
 	 non-addressability may be uncovered again, causing ADDR_EXPRs
 	 of inappropriate objects to be built.  */
-      return AGGREGATE_TYPE_P (TREE_TYPE (expr))
-	     && !AGGREGATE_TYPE_P (TREE_TYPE (TREE_OPERAND (expr, 0)));
+      if (AGGREGATE_TYPE_P (TREE_TYPE (expr))
+	  && !AGGREGATE_TYPE_P (TREE_TYPE (TREE_OPERAND (expr, 0))))
+	return true;
+
+      /* ... fall through ... */
+
+    case ARRAY_REF:
+    case ARRAY_RANGE_REF:
+      return may_be_nonaddressable_p (TREE_OPERAND (expr, 0));
+
+    case CONVERT_EXPR:
+    case NON_LVALUE_EXPR:
+    case NOP_EXPR:
+      return true;
 
     default:
       break;
@@ -1476,13 +1489,6 @@ find_interesting_uses_address (struct ivopts_data *data, tree stmt, tree *op_p)
   if (TREE_CODE (base) == BIT_FIELD_REF)
     goto fail;
 
-  if (may_be_nonaddressable_p (base))
-    goto fail;
-
-  if (STRICT_ALIGNMENT
-      && may_be_unaligned_p (base))
-    goto fail;
-
   base = unshare_expr (base);
 
   if (TREE_CODE (base) == TARGET_MEM_REF)
@@ -1536,6 +1542,16 @@ find_interesting_uses_address (struct ivopts_data *data, tree stmt, tree *op_p)
       gcc_assert (TREE_CODE (base) != ALIGN_INDIRECT_REF);
       gcc_assert (TREE_CODE (base) != MISALIGNED_INDIRECT_REF);
 
+      /* Check that the base expression is addressable.  This needs
+	 to be done after substituting bases of IVs into it.  */
+      if (may_be_nonaddressable_p (base))
+	goto fail;
+
+      /* Moreover, on strict alignment platforms, check that it is
+	 sufficiently aligned.  */
+      if (STRICT_ALIGNMENT && may_be_unaligned_p (base))
+	goto fail;
+
       base = build_fold_addr_expr (base);
 
       /* Substituting bases of IVs into the base expression might