/*
- * Copyright (C) 1995-2010 University of Karlsruhe. All right reserved.
- *
* This file is part of libFirm.
- *
- * This file may be distributed and/or modified under the terms of the
- * GNU General Public License version 2 as published by the Free Software
- * Foundation and appearing in the file LICENSE.GPL included in the
- * packaging of this file.
- *
- * Licensees holding valid libFirm Professional Edition licenses may use
- * this file in accordance with the libFirm Commercial License.
- * Agreement provided with the Software.
- *
- * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
- * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE.
+ * Copyright (C) 2012 University of Karlsruhe.
*/
/**
* @brief This file contains functions for matching firm graphs for
* nodes that can be used as address mode for x86 instructions
* @author Matthias Braun
- * @version $Id$
*/
#include "config.h"
#include "iredges_t.h"
#include "irgwalk.h"
-#include "../benode.h"
-#include "../belive.h"
+#include "benode.h"
+#include "belive.h"
#define AGGRESSIVE_AM
#ifdef DEBUG_libfirm
ir_fprintf(stderr,
"Optimisation warning tarval of %+F(%+F) is not a long.\n",
- node, current_ir_graph);
+ node, get_irn_irg(node));
#endif
return false;
}
}
/**
- * Check if a given value is last used (i.e. die after) the block of some other node.
+ * Check if a given value is last used (i.e. die after) the block of some
+ * other node.
*/
static int value_last_used_here(be_lv_t *lv, ir_node *here, ir_node *value)
{
- ir_node *block = get_nodes_block(here);
- const ir_edge_t *edge;
+ ir_node *block = get_nodes_block(here);
/* If the value is live end it is for sure it does not die here */
if (be_is_live_end(lv, block, value)) return 0;
return 1;
}
+static bool simple_is_immediate(const ir_node *node)
+{
+ int symconsts = 0;
+ return do_is_immediate(node, &symconsts, false);
+}
+
/**
* Walker: mark those nodes that cannot be part of an address mode because
* their value must be accessed through a register
left = get_binop_left(node);
right = get_binop_right(node);
- /* Fold AM if any of the two operands does not die here. This duplicates
+ /* if any of the operands is an immediate then this will not
+ * increase register pressure */
+ if (simple_is_immediate(left) || simple_is_immediate(right))
+ return;
+
+ /* Fold AM if any of the two operands does not die here. This duplicates
* an addition and has the same register pressure for the case that only
* one operand dies, but is faster (on Pentium 4).
* && instead of || only folds AM if both operands do not die here */
if (!value_last_used_here(lv, node, left) ||
- !value_last_used_here(lv, node, right)) {
+ !value_last_used_here(lv, node, right)) {
return;
}
void ia32_calculate_non_address_mode_nodes(ir_graph *irg)
{
- be_lv_t *lv = be_assure_liveness(irg);
+ be_lv_t *lv;
+
+ be_assure_live_chk(irg);
+ lv = be_get_irg_liveness(irg);
non_address_mode_nodes = bitset_malloc(get_irg_last_idx(irg));