/* Generic routines for manipulating PHIs
- Copyright (C) 2003, 2005 Free Software Foundation, Inc.
+ Copyright (C) 2003, 2005, 2007 Free Software Foundation, Inc.
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2, or (at your option)
+the Free Software Foundation; either version 3, or (at your option)
any later version.
GCC is distributed in the hope that it will be useful,
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
-along with GCC; see the file COPYING. If not, write to
-the Free Software Foundation, 59 Temple Place - Suite 330,
-Boston, MA 02111-1307, USA. */
+along with GCC; see the file COPYING3. If not see
+<http://www.gnu.org/licenses/>. */
#include "config.h"
#include "system.h"
TREE_SET_CODE (phi, PHI_NODE);
PHI_NUM_ARGS (phi) = len;
PHI_ARG_CAPACITY (phi) = capacity;
- TREE_TYPE (phi) = TREE_TYPE (var);
if (TREE_CODE (var) == SSA_NAME)
SET_PHI_RESULT (phi, var);
else
for (i = 0; i < capacity; i++)
{
- ssa_imm_use_t * imm;
+ use_operand_p imm;
imm = &(PHI_ARG_IMM_USE_NODE (phi, i));
imm->use = &(PHI_ARG_DEF_TREE (phi, i));
imm->prev = NULL;
imm->next = NULL;
imm->stmt = phi;
}
+
return phi;
}
for (x = 0; x < PHI_NUM_ARGS (phi); x++)
{
- ssa_imm_use_t * imm;
+ use_operand_p imm;
imm = &(PHI_ARG_IMM_USE_NODE (phi, x));
delink_imm_use (imm);
}
for (i = 0; i < PHI_NUM_ARGS (new_phi); i++)
{
- ssa_imm_use_t *imm, *old_imm;
+ use_operand_p imm, old_imm;
imm = &(PHI_ARG_IMM_USE_NODE (new_phi, i));
old_imm = &(PHI_ARG_IMM_USE_NODE (*phi, i));
imm->use = &(PHI_ARG_DEF_TREE (new_phi, i));
for (i = PHI_NUM_ARGS (new_phi); i < len; i++)
{
- ssa_imm_use_t * imm;
+ use_operand_p imm;
imm = &(PHI_ARG_IMM_USE_NODE (new_phi, i));
imm->use = &(PHI_ARG_DEF_TREE (new_phi, i));
imm->prev = NULL;
imm->stmt = new_phi;
}
-
*phi = new_phi;
}
int len = EDGE_COUNT (bb->preds);
int cap = ideal_phi_node_len (len + 4);
- for (loc = &(bb_ann (bb)->phi_nodes);
+ for (loc = phi_nodes_ptr (bb);
*loc;
loc = &PHI_CHAIN (*loc))
{
}
}
+
/* Create a new PHI node for variable VAR at basic block BB. */
tree
/* Add the new PHI node to the list of PHI nodes for block BB. */
PHI_CHAIN (phi) = phi_nodes (bb);
- bb_ann (bb)->phi_nodes = phi;
+ set_phi_nodes (bb, phi);
/* Associate BB to the PHI node. */
set_bb_for_stmt (phi, bb);
return phi;
}
+
/* Add a new argument to PHI node PHI. DEF is the incoming reaching
definition and E is the edge through which DEF reaches PHI. The new
argument is added at the end of the argument list.
}
SET_PHI_ARG_DEF (phi, e->dest_idx, def);
- PHI_ARG_NONZERO (phi, e->dest_idx) = false;
}
+
/* Remove the Ith argument from PHI's argument list. This routine
implements removal by swapping the last alternative with the
alternative we want to delete and then shrinking the vector, which
gcc_assert (i < num_elem);
- /* Delink the last item, which is being removed. */
- delink_imm_use (&(PHI_ARG_IMM_USE_NODE (phi, num_elem - 1)));
+ /* Delink the item which is being removed. */
+ delink_imm_use (&(PHI_ARG_IMM_USE_NODE (phi, i)));
- /* If we are not at the last element, switch the last element
- with the element we want to delete. */
+ /* If it is not the last element, move the last element
+ to the element we want to delete, resetting all the links. */
if (i != num_elem - 1)
{
- SET_PHI_ARG_DEF (phi, i, PHI_ARG_DEF (phi, num_elem - 1));
- PHI_ARG_NONZERO (phi, i) = PHI_ARG_NONZERO (phi, num_elem - 1);
+ use_operand_p old_p, new_p;
+ old_p = &PHI_ARG_IMM_USE_NODE (phi, num_elem - 1);
+ new_p = &PHI_ARG_IMM_USE_NODE (phi, i);
+ /* Set use on new node, and link into last element's place. */
+ *(new_p->use) = *(old_p->use);
+ relink_imm_use (new_p, old_p);
}
/* Shrink the vector and return. Note that we do not have to clear
- PHI_ARG_DEF or PHI_ARG_NONZERO because the garbage collector will
- not look at those elements beyond the first PHI_NUM_ARGS elements
- of the array. */
+ PHI_ARG_DEF because the garbage collector will not look at those
+ elements beyond the first PHI_NUM_ARGS elements of the array. */
PHI_NUM_ARGS (phi)--;
}
+
/* Remove all PHI arguments associated with edge E. */
void
remove_phi_arg_num (phi, e->dest_idx);
}
+
/* Remove PHI node PHI from basic block BB. If PREV is non-NULL, it is
- used as the node immediately before PHI in the linked list. */
+ used as the node immediately before PHI in the linked list. If
+ RELEASE_LHS_P is true, the LHS of this PHI node is released into
+ the free pool of SSA names. */
void
-remove_phi_node (tree phi, tree prev)
+remove_phi_node (tree phi, tree prev, bool release_lhs_p)
{
tree *loc;
}
else
{
- for (loc = &(bb_ann (bb_for_stmt (phi))->phi_nodes);
+ for (loc = phi_nodes_ptr (bb_for_stmt (phi));
*loc != phi;
loc = &PHI_CHAIN (*loc))
;
/* If we are deleting the PHI node, then we should release the
SSA_NAME node so that it can be reused. */
release_phi_node (phi);
- release_ssa_name (PHI_RESULT (phi));
-}
-
-
-/* Find the first PHI node P in basic block BB for symbol SYM. If
- PREV_P is given, the PHI node preceding P is stored in *PREV_P. */
-
-tree
-find_phi_node_for (basic_block bb, tree sym, tree *prev_p)
-{
- tree phi;
-
- if (prev_p)
- *prev_p = NULL_TREE;
-
- for (phi = phi_nodes (bb); phi; phi = PHI_CHAIN (phi))
- {
- if (SSA_NAME_VAR (PHI_RESULT (phi)) == sym)
- return phi;
-
- if (prev_p)
- *prev_p = phi;
- }
-
- return NULL_TREE;
+ if (release_lhs_p)
+ release_ssa_name (PHI_RESULT (phi));
}
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