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tree-phinodes.c (make_phi_node, [...]): Don't zero the whole PHI node.

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* 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.

From-SVN: r89844
This commit is contained in:
Kazu Hirata 2004-10-29 14:05:43 +00:00 • committed by Kazu Hirata
parent fe94b6534a
commit c24a4dcffa
3 changed files with 15 additions and 11 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
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> 2004-10-29 Richard Earnshaw <rearnsha@arm.com>
* opts.c (decode_options): Lower the crossjump threshold for -Os. * opts.c (decode_options): Lower the crossjump threshold for -Os.

17
gcc/tree-phinodes.c
View file

@ -199,7 +199,12 @@ make_phi_node (tree var, int len)
} }
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); TREE_SET_CODE (phi, PHI_NODE);
PHI_ARG_CAPACITY (phi) = len; PHI_ARG_CAPACITY (phi) = len;
TREE_TYPE (phi) = TREE_TYPE (var); TREE_TYPE (phi) = TREE_TYPE (var);
@ -234,7 +239,7 @@ resize_phi_node (tree *phi, int len)
{ {
int size, old_size; int size, old_size;
tree new_phi; tree new_phi;
int i, old_len, bucket = NUM_BUCKETS - 2; int bucket = NUM_BUCKETS - 2;
gcc_assert (len >= PHI_ARG_CAPACITY (*phi)); gcc_assert (len >= PHI_ARG_CAPACITY (*phi));
@ -271,16 +276,8 @@ resize_phi_node (tree *phi, int len)
memcpy (new_phi, *phi, old_size); memcpy (new_phi, *phi, old_size);
old_len = PHI_ARG_CAPACITY (new_phi);
PHI_ARG_CAPACITY (new_phi) = len; 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; *phi = new_phi;
} }

2
gcc/tree.h
View file

@ -1405,7 +1405,7 @@ struct tree_phi_node GTY(())
/* Dataflow information. */ /* Dataflow information. */
struct dataflow_d *df; struct dataflow_d *df;
struct phi_arg_d GTY ((length ("((tree)&%h)->phi.capacity"))) a[1]; struct phi_arg_d GTY ((length ("((tree)&%h)->phi.num_args"))) a[1];
}; };