+2004-10-29 Kazu Hirata <kazu@cs.umass.edu>
+
+ * tree-phinodes.c (make_phi_node, resize_phi_node): Don't zero
+ the whole PHI node.
+ * tree.h (tree_phi_node): Tell the garbage collector to chase
+ num_args arguments.
+
2004-10-29 Richard Earnshaw <rearnsha@arm.com>
* opts.c (decode_options): Lower the crossjump threshold for -Os.
}
- memset (phi, 0, size);
+ /* We do not have to clear a part of the PHI node that stores PHI
+ arguments, which is safe because we tell the garbage collector to
+ scan up to num_args elements in the array of PHI arguments. In
+ other words, the garbage collector will not follow garbage
+ pointers in the unused portion of the array. */
+ memset (phi, 0, sizeof (struct tree_phi_node) - sizeof (struct phi_arg_d));
TREE_SET_CODE (phi, PHI_NODE);
PHI_ARG_CAPACITY (phi) = len;
TREE_TYPE (phi) = TREE_TYPE (var);
{
int size, old_size;
tree new_phi;
- int i, old_len, bucket = NUM_BUCKETS - 2;
+ int bucket = NUM_BUCKETS - 2;
gcc_assert (len >= PHI_ARG_CAPACITY (*phi));
memcpy (new_phi, *phi, old_size);
- old_len = PHI_ARG_CAPACITY (new_phi);
PHI_ARG_CAPACITY (new_phi) = len;
- for (i = old_len; i < len; i++)
- {
- SET_PHI_ARG_DEF (new_phi, i, NULL_TREE);
- PHI_ARG_EDGE (new_phi, i) = NULL;
- PHI_ARG_NONZERO (new_phi, i) = false;
- }
-
*phi = new_phi;
}