re PR tree-optimization/25528 (missed LIM on the tree level (complex types))

2006-01-06  Andrew Pinski  <pinskia@physics.uc.edu>

        PR tree-opt/25528
        * tree-ssa-alias.c (find_used_portions): Handle REALPART_EXPR
        and IMAGPART_EXPR.
        * tree-flow-inline.h (var_can_have_subvars): Handle complex types
        on non gimple variables.  Also add checks at the top for decls and
        mtags.
        * tree-ssa-structalias.c (push_fields_onto_fieldstack): Handle
        complex types.
        * tree-ssa-operands.c (parse_ssa_operands): Handle REALPART_EXPR
        and IMAGPART_EXPR for creating MUST_DEFs.
        (get_expr_operands): Handle SSA_NAME, STRUCT_FIELD_TAG, TYPE_MEMORY_TAG,
        and NAME_MEMORY_TAG separately from the DECLs.

From-SVN: r109419

1 files changed, 18 insertions, 3 deletions

diff --git a/gcc/tree-flow-inline.h b/gcc/tree-flow-inline.h
index 94e1972..3f8e89d 100644
--- a/gcc/tree-flow-inline.h
+++ b/gcc/tree-flow-inline.h
@@ -1490,13 +1490,28 @@ get_subvar_at (tree var, unsigned HOST_WIDE_INT offset)
 
 /* Return true if V is a tree that we can have subvars for.
    Normally, this is any aggregate type, however, due to implementation
-   limitations ATM, we exclude array types as well.  */
+   limitations ATM, we exclude array types as well.  Also complex
+   types which are not gimple registers can have subvars.  */
 
 static inline bool
 var_can_have_subvars (tree v)
 {
-  return (AGGREGATE_TYPE_P (TREE_TYPE (v)) &&
-	  TREE_CODE (TREE_TYPE (v)) != ARRAY_TYPE);
+  /* Non decls or memory tags can never have subvars.  */
+  if (!DECL_P (v) || MTAG_P (v))
+    return false;
+
+  /* Aggregates besides arrays can have subvars.  */
+  if (AGGREGATE_TYPE_P (TREE_TYPE (v))
+      && TREE_CODE (TREE_TYPE (v)) != ARRAY_TYPE)
+    return true;
+
+  /* Complex types variables which are not also a gimple register can
+    have subvars. */
+  if (TREE_CODE (TREE_TYPE (v)) == COMPLEX_TYPE
+      && !DECL_COMPLEX_GIMPLE_REG_P (v))
+    return true;
+
+  return false;
 }