2010-04-07 Richard Guenther <rguenther@suse.de>
PR middle-end/42617
+ * alias.c (ao_ref_from_mem): Without MEM_OFFSET or MEM_SIZE
+ preserve points-to related information.
+
+2010-04-07 Richard Guenther <rguenther@suse.de>
+
+ PR middle-end/42617
* emit-rtl.c (set_mem_attributes_minus_bitpos): Do not
discard plain indirect references.
* fold-const.c (operand_equal_p): Guard against NULL_TREE
if (!expr)
return false;
- /* If MEM_OFFSET or MEM_SIZE are NULL punt. */
- if (!MEM_OFFSET (mem)
- || !MEM_SIZE (mem))
- return false;
-
ao_ref_init (ref, expr);
/* Get the base of the reference and see if we have to reject or
if (base == NULL_TREE)
return false;
+ /* The tree oracle doesn't like to have these. */
+ if (TREE_CODE (base) == FUNCTION_DECL
+ || TREE_CODE (base) == LABEL_DECL)
+ return false;
+
/* If this is a pointer dereference of a non-SSA_NAME punt.
??? We could replace it with a pointer to anything. */
if (INDIRECT_REF_P (base)
&& TREE_CODE (TREE_OPERAND (base, 0)) != SSA_NAME)
return false;
- /* The tree oracle doesn't like to have these. */
- if (TREE_CODE (base) == FUNCTION_DECL
- || TREE_CODE (base) == LABEL_DECL)
- return false;
-
/* If this is a reference based on a partitioned decl replace the
base with an INDIRECT_REF of the pointer representative we
created during stack slot partitioning. */
ref->ref_alias_set = MEM_ALIAS_SET (mem);
+ /* If MEM_OFFSET or MEM_SIZE are NULL we have to punt.
+ Keep points-to related information though. */
+ if (!MEM_OFFSET (mem)
+ || !MEM_SIZE (mem))
+ {
+ ref->ref = NULL_TREE;
+ ref->offset = 0;
+ ref->size = -1;
+ ref->max_size = -1;
+ return true;
+ }
+
/* If the base decl is a parameter we can have negative MEM_OFFSET in
case of promoted subregs on bigendian targets. Trust the MEM_EXPR
here. */