irnode.c 22 KB
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/*
 * This file is part of libFirm.
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 * Copyright (C) 2012 University of Karlsruhe.
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 */

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/**
 * @file
 * @brief   Representation of an intermediate operation.
 * @author  Martin Trapp, Christian Schaefer, Goetz Lindenmaier, Michael Beck
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 */
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#include <string.h>
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#include "pset_new.h"
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#include "ident.h"
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#include "irnode_t.h"
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#include "irgraph_t.h"
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#include "irmode_t.h"
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#include "irbackedge_t.h"
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#include "irdump.h"
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#include "irop_t.h"
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#include "irprog_t.h"
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#include "iredgekinds.h"
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#include "iredges_t.h"
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#include "ircons.h"
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#include "irprintf.h"
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#include "panic.h"
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#include "irverify.h"
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#include "irhooks.h"
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#include "util.h"
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#include "beinfo.h"

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/* some constants fixing the positions of nodes predecessors
   in the in array */
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#define END_KEEPALIVE_OFFSET  0
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const char *get_relation_string(ir_relation relation)
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{
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	static char const *const relation_names[] = {
		"false",
		"equal",
		"less",
		"less_equal",
		"greater",
		"greater_equal",
		"less_greater",
		"less_equal_greater",
		"unordered",
		"unordered_equal",
		"unordered_less",
		"unordered_less_equal",
		"unordered_greater",
		"unordered_greater_equal",
		"not_equal",
		"true"
	};

	assert((size_t)relation < ARRAY_SIZE(relation_names));
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	return relation_names[relation];
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}

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ir_relation get_negated_relation(ir_relation relation)
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{
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	return relation ^ ir_relation_true;
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}

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ir_relation get_inversed_relation(ir_relation relation)
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{
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	ir_relation code    = relation & ~(ir_relation_less|ir_relation_greater);
	bool        less    = relation & ir_relation_less;
	bool        greater = relation & ir_relation_greater;
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	code |= (less ? ir_relation_greater : ir_relation_false)
	      | (greater ? ir_relation_less : ir_relation_false);
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	return code;
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}

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ir_node *new_ir_node(dbg_info *db, ir_graph *irg, ir_node *block, ir_op *op,
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                     ir_mode *mode, int arity, ir_node *const *in)
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{
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	assert(mode != NULL);
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	size_t   const node_size = offsetof(ir_node, attr) + op->attr_size;
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	ir_node *const res       = (ir_node*)OALLOCNZ(get_irg_obstack(irg), char, node_size);
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	res->kind     = k_ir_node;
	res->op       = op;
	res->mode     = mode;
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	res->irg      = irg;
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	res->visited  = 0;
	res->node_idx = irg_register_node_idx(irg, res);
	res->link     = NULL;

	if (arity < 0) {
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		res->in = NEW_ARR_F(ir_node *, 1);  /* 1: space for block */
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	} else {
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		/* Nodes with dynamic arity must always have a flexible array. */
		if (op->opar == oparity_dynamic)
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			res->in = NEW_ARR_F(ir_node *, (arity+1));
		else
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			res->in = NEW_ARR_D(ir_node*, get_irg_obstack(irg), arity + 1);
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		MEMCPY(&res->in[1], in, arity);
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	}

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	res->in[0]   = block;
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	set_irn_dbg_info(res, db);
	res->node_nr = get_irp_new_node_nr();
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	for (ir_edge_kind_t i = EDGE_KIND_FIRST; i <= EDGE_KIND_LAST; ++i) {
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		INIT_LIST_HEAD(&res->edge_info[i].outs_head);
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		/* Edges will be built immediately. */
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		res->edge_info[i].edges_built = 1;
		res->edge_info[i].out_count = 0;
	}
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	/* don't put this into the for loop, arity is -1 for some nodes! */
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	if (block != NULL)
		edges_notify_edge(res, -1, block, NULL, irg);
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	for (int i = 0; i < arity; ++i)
		edges_notify_edge(res, i, res->in[i+1], NULL, irg);
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	hook_new_node(res);
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	if (irg_is_constrained(irg, IR_GRAPH_CONSTRAINT_BACKEND))
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		be_info_new_node(irg, res);
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	return res;
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}

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ir_node *new_similar_node(ir_node *const old, ir_node *const block, ir_node **const in)
{
	dbg_info *const dbgi  = get_irn_dbg_info(old);
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	ir_graph *const irg   = get_irn_irg(old);
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	ir_op    *const op    = get_irn_op(old);
	ir_mode  *const mode  = get_irn_mode(old);
	int       const arity = get_irn_arity(old);
	ir_node  *const n     = new_ir_node(dbgi, irg, block, op, mode, arity, in);
	copy_node_attr(irg, old, n);
	return n;
}

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int (get_irn_arity)(const ir_node *node)
{
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	return get_irn_arity_(node);
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}

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void set_irn_in(ir_node *const node, int const arity, ir_node *const *const in)
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{
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	assert(node != NULL && node->kind == k_ir_node);
	assert(arity >= 0);
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#ifndef NDEBUG
	for (int i = 0; i < arity; ++i) {
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		assert(in[i] != NULL && in[i]->kind == k_ir_node);
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	}
#endif
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	ir_graph  *irg     = get_irn_irg(node);
	ir_node ***pOld_in = &node->in;
	int        i;
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	for (i = 0; i < arity; i++) {
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		if (i < (int)ARR_LEN(*pOld_in)-1)
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			edges_notify_edge(node, i, in[i], (*pOld_in)[i+1], irg);
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		else
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			edges_notify_edge(node, i, in[i], NULL,            irg);
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	}
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	for (;i < (int)ARR_LEN(*pOld_in)-1; i++) {
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		edges_notify_edge(node, i, NULL, (*pOld_in)[i+1], irg);
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	}

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	if (arity != (int)ARR_LEN(*pOld_in) - 1) {
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		ir_node * block = (*pOld_in)[0];
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		*pOld_in = NEW_ARR_D(ir_node*, get_irg_obstack(irg), arity + 1);
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		(*pOld_in)[0] = block;
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	}
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	fix_backedges(get_irg_obstack(irg), node);
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	MEMCPY(*pOld_in + 1, in, arity);
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	/* update irg flags */
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	clear_irg_properties(irg, IR_GRAPH_PROPERTY_CONSISTENT_OUTS | IR_GRAPH_PROPERTY_CONSISTENT_LOOPINFO);
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}

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ir_node *(get_irn_n)(const ir_node *node, int n)
{
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	return get_irn_n_(node, n);
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}

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void set_irn_n(ir_node *node, int n, ir_node *in)
{
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	ir_graph *irg = get_irn_irg(node);
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	assert(node && node->kind == k_ir_node);
	assert(-1 <= n);
	assert(n < get_irn_arity(node));
	assert(in && in->kind == k_ir_node);
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	assert(!is_Deleted(in));
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	/* Call the hook */
	hook_set_irn_n(node, n, in, node->in[n + 1]);

	/* Here, we rely on src and tgt being in the current ir graph */
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	edges_notify_edge(node, n, in, node->in[n + 1], irg);
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	node->in[n + 1] = in;
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	/* update irg flags */
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	clear_irg_properties(irg, IR_GRAPH_PROPERTY_CONSISTENT_OUTS | IR_GRAPH_PROPERTY_CONSISTENT_LOOPINFO);
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}

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int add_irn_n(ir_node *node, ir_node *in)
{
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	ir_graph *irg = get_irn_irg(node);

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	assert(is_irn_dynamic(node));
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	int pos = ARR_LEN(node->in) - 1;
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	ARR_APP1(ir_node *, node->in, in);
	edges_notify_edge(node, pos, node->in[pos + 1], NULL, irg);

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	/* Call the hook */
	hook_set_irn_n(node, pos, node->in[pos + 1], NULL);

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	/* update irg flags */
	clear_irg_properties(irg, IR_GRAPH_PROPERTY_CONSISTENT_OUTS);

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	return pos;
}

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static void remove_irn_n(ir_node *node, int n)
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{
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	ir_graph *const irg   = get_irn_irg(node);
	int       const arity = get_irn_arity(node);
	ir_node  *const last  = node->in[arity];
	if (n != arity - 1) {
		/* Replace by last edge. */
		ir_node **const slot = &node->in[n + 1];
		ir_node  *const pred = *slot;
		*slot = last;
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		edges_notify_edge(node, n, last, pred, irg);
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	}
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	/* Remove last edge. */
	edges_notify_edge(node, arity - 1, NULL, last, irg);
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	ARR_SHRINKLEN(node->in, arity);

	/* update irg flags */
	clear_irg_properties(irg, IR_GRAPH_PROPERTY_CONSISTENT_OUTS);
}

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void remove_Sync_n(ir_node *n, int i)
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{
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	remove_irn_n(n, i);
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}

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ir_mode *(get_irn_mode)(const ir_node *node)
{
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	return get_irn_mode_(node);
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}

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void (set_irn_mode)(ir_node *node, ir_mode *mode)
{
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	set_irn_mode_(node, mode);
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}

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ir_op *(get_irn_op)(const ir_node *node)
{
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	return get_irn_op_(node);
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}

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unsigned (get_irn_opcode)(const ir_node *node)
{
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	return get_irn_opcode_(node);
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}

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const char *get_irn_opname(const ir_node *node)
{
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	return get_id_str(node->op->name);
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}

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ident *get_irn_opident(const ir_node *node)
{
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	assert(node);
	return node->op->name;
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}

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ir_visited_t (get_irn_visited)(const ir_node *node)
{
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	return get_irn_visited_(node);
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}

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void (set_irn_visited)(ir_node *node, ir_visited_t visited)
{
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	set_irn_visited_(node, visited);
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}
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void (mark_irn_visited)(ir_node *node)
{
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	mark_irn_visited_(node);
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}

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int (irn_visited)(const ir_node *node)
{
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	return irn_visited_(node);
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}

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int (irn_visited_else_mark)(ir_node *node)
{
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	return irn_visited_else_mark_(node);
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}

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void (set_irn_link)(ir_node *node, void *link)
{
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	set_irn_link_(node, link);
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}

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void *(get_irn_link)(const ir_node *node)
{
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	return get_irn_link_(node);
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}

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op_pin_state (get_irn_pinned)(const ir_node *node)
{
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	return get_irn_pinned_(node);
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}

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void set_irn_pinned(ir_node *node, op_pin_state state)
{
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	assert(get_op_pinned(get_irn_op(node)) >= op_pin_state_exc_pinned);
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	assert(state == op_pin_state_pinned || state == op_pin_state_floats);
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	node->attr.except.pin_state = state;
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}
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long get_irn_node_nr(const ir_node *node)
{
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	assert(node->kind == k_ir_node);
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	return node->node_nr;
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}
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void *(get_irn_generic_attr)(ir_node *node)
{
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	assert(node->kind == k_ir_node);
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	return get_irn_generic_attr_(node);
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}

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const void *(get_irn_generic_attr_const)(const ir_node *node)
{
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	assert(node->kind == k_ir_node);
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	return get_irn_generic_attr_const_(node);
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}

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unsigned (get_irn_idx)(const ir_node *node)
{
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	assert(node->kind == k_ir_node);
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	return get_irn_idx_(node);
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}

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ir_node *(get_nodes_block)(const ir_node *node)
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{
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	return get_nodes_block_(node);
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}

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void set_nodes_block(ir_node *node, ir_node *block)
{
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	assert(!is_Block(node));
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	set_irn_n(node, -1, block);
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}

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ir_node *(get_Block_cfgpred_block)(const ir_node *node, int pos)
{
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	return get_Block_cfgpred_block_(node, pos);
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}

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int get_Block_matured(const ir_node *node)
{
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	assert(is_Block(node));
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	return (int)node->attr.block.is_matured;
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}

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void set_Block_matured(ir_node *node, int matured)
{
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	assert(is_Block(node));
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	node->attr.block.is_matured = matured;
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}
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ir_visited_t (get_Block_block_visited)(const ir_node *node)
{
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	return get_Block_block_visited_(node);
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}

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void (set_Block_block_visited)(ir_node *node, ir_visited_t visit)
{
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	set_Block_block_visited_(node, visit);
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}

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void (mark_Block_block_visited)(ir_node *node)
{
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	mark_Block_block_visited_(node);
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}

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int (Block_block_visited)(const ir_node *node)
{
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	return Block_block_visited_(node);
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}

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ir_entity *create_Block_entity(ir_node *block)
{
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	ir_entity *entity;
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	assert(is_Block(block));
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	entity = block->attr.block.entity;
	if (entity == NULL) {
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		ir_label_t nr = get_irp_next_label_nr();
		entity = new_label_entity(nr);
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		set_entity_visibility(entity, ir_visibility_local);
		set_entity_linkage(entity, IR_LINKAGE_CONSTANT);
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		set_entity_compiler_generated(entity, 1);

		block->attr.block.entity = entity;
	}
	return entity;
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}

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ir_node *(get_Block_phis)(const ir_node *block)
{
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	return get_Block_phis_(block);
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}

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void (set_Block_phis)(ir_node *block, ir_node *phi)
{
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	set_Block_phis_(block, phi);
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}

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void (add_Block_phi)(ir_node *block, ir_node *phi)
{
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	add_Block_phi_(block, phi);
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}

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unsigned (get_Block_mark)(const ir_node *block)
{
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	return get_Block_mark_(block);
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}

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void (set_Block_mark)(ir_node *block, unsigned mark)
{
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	set_Block_mark_(block, mark);
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}

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void add_End_keepalive(ir_node *end, ir_node *ka)
{
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	assert(is_End(end));
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	add_irn_n(end, ka);
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}

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void set_End_keepalives(ir_node *end, int n, ir_node *in[])
{
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	/* notify that edges are deleted */
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	ir_graph *irg = get_irn_irg(end);
	for (size_t e = END_KEEPALIVE_OFFSET; e < ARR_LEN(end->in) - 1; ++e) {
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		edges_notify_edge(end, e, NULL, end->in[e + 1], irg);
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	}
	ARR_RESIZE(ir_node *, end->in, n + 1 + END_KEEPALIVE_OFFSET);
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	for (int i = 0; i < n; ++i) {
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		end->in[1 + END_KEEPALIVE_OFFSET + i] = in[i];
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		edges_notify_edge(end, END_KEEPALIVE_OFFSET + i, end->in[1 + END_KEEPALIVE_OFFSET + i], NULL, irg);
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	}
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	/* update irg flags */
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	clear_irg_properties(irg, IR_GRAPH_PROPERTY_CONSISTENT_OUTS);
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}
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void remove_End_n(ir_node *n, int idx)
{
	remove_irn_n(n, idx);
}

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void remove_End_keepalive(ir_node *end, const ir_node *irn)
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{
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	assert(END_KEEPALIVE_OFFSET == 0);
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	foreach_irn_in_r(end, i, ka) {
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		if (ka == irn) {
			remove_irn_n(end, i);
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			return;
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		}
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	}
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}
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void remove_keep_alive(const ir_node *irn)
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{
	ir_graph *irg = get_irn_irg(irn);
	ir_node  *end = get_irg_end(irg);

	for (int i = get_End_n_keepalives(end);;) {
		if (i-- == 0)
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			return;
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		ir_node *old_ka = end->in[1 + END_KEEPALIVE_OFFSET + i];

		/* find irn */
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		if (old_ka == irn)
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			set_irn_n(end, END_KEEPALIVE_OFFSET+i, new_r_Bad(irg, get_irn_mode(irn)));
	}
}

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void remove_End_Bads_and_doublets(ir_node *end)
{
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	int n = get_End_n_keepalives(end);
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	if (n <= 0)
		return;

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	ir_graph *irg = get_irn_irg(end);
	pset_new_t keeps;
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	pset_new_init(&keeps);

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	bool changed = false;
	for (int idx = n; idx-- > 0; ) {
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		ir_node *ka = get_End_keepalive(end, idx);

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		if (is_Bad(ka) || is_NoMem(ka) || pset_new_contains(&keeps, ka)) {
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			changed = true;
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			remove_irn_n(end, idx - END_KEEPALIVE_OFFSET);
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			--n;
		} else {
			pset_new_insert(&keeps, ka);
		}
	}
	pset_new_destroy(&keeps);
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	if (changed)
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		clear_irg_properties(irg, IR_GRAPH_PROPERTY_CONSISTENT_OUTS);
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}

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void free_End(ir_node *end)
{
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	assert(is_End(end));
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	end->kind = k_BAD;
	DEL_ARR_F(end->in);
	end->in = NULL;   /* @@@ make sure we get an error if we use the
	                     in array afterwards ... */
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}

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int (is_Const_null)(const ir_node *node)
{
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	return is_Const_null_(node);
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}

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int (is_Const_one)(const ir_node *node)
{
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	return is_Const_one_(node);
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}

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int (is_Const_all_one)(const ir_node *node)
{
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	return is_Const_all_one_(node);
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}

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const char *get_builtin_kind_name(ir_builtin_kind kind)
{
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#define X(a)    case a: return #a
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	switch (kind) {
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		X(ir_bk_trap);
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		X(ir_bk_debugbreak);
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		X(ir_bk_return_address);
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		X(ir_bk_frame_address);
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		X(ir_bk_prefetch);
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		X(ir_bk_ffs);
		X(ir_bk_clz);
		X(ir_bk_ctz);
		X(ir_bk_popcount);
		X(ir_bk_parity);
		X(ir_bk_bswap);
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		X(ir_bk_inport);
		X(ir_bk_outport);
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		X(ir_bk_saturating_increment);
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		X(ir_bk_compare_swap);
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		X(ir_bk_may_alias);
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	}
	return "<unknown>";
#undef X
}

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ir_entity *get_Call_callee(const ir_node *node)
{
	ir_node *ptr = get_Call_ptr(node);
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	if (!is_Address(ptr))
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		return NULL;
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	ir_entity *entity = get_Address_entity(ptr);
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	/* some (corner case/pointless) graphs can have non-method entities as
	 * call pointers */
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	if (!is_method_entity(entity) && !is_alias_entity(entity))
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		return NULL;
	return entity;
}

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ir_node *get_binop_left(const ir_node *node)
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{
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	assert(is_binop(node));
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	return get_irn_n(node, node->op->op_index);
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}

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void set_binop_left(ir_node *node, ir_node *left)
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{
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	assert(is_binop(node));
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	set_irn_n(node, node->op->op_index, left);
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}

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ir_node *get_binop_right(const ir_node *node)
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{
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	assert(is_binop(node));
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	return get_irn_n(node, node->op->op_index + 1);
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}

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void set_binop_right(ir_node *node, ir_node *right)
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{
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	assert(is_binop(node));
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	set_irn_n(node, node->op->op_index + 1, right);
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}

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ir_node *(get_Phi_next)(const ir_node *phi)
{
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	return get_Phi_next_(phi);
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}

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void (set_Phi_next)(ir_node *phi, ir_node *next)
{
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	set_Phi_next_(phi, next);
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}
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int is_memop(const ir_node *node)
{
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	return is_op_uses_memory(get_irn_op(node));
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}

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ir_node *get_memop_mem(const ir_node *node)
{
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	const ir_op *op = get_irn_op(node);
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	assert(is_memop(node));
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	return get_irn_n(node, op->memory_index);
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}

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void set_memop_mem(ir_node *node, ir_node *mem)
{
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	const ir_op *op = get_irn_op(node);
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	assert(is_memop(node));
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	set_irn_n(node, op->memory_index, mem);
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}

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void add_Sync_pred(ir_node *node, ir_node *pred)
{
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	assert(is_Sync(node));
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	add_irn_n(node, pred);
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}

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int is_x_except_Proj(const ir_node *node)
{
	if (!is_Proj(node))
		return false;
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	ir_node *pred = get_Proj_pred(node);
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	if (!is_fragile_op(pred))
		return false;
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	return get_Proj_num(node) == pred->op->pn_x_except;
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}

int is_x_regular_Proj(const ir_node *node)
{
	if (!is_Proj(node))
		return false;
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	ir_node *pred = get_Proj_pred(node);
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	if (!is_fragile_op(pred))
		return false;
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	return get_Proj_num(node) == pred->op->pn_x_regular;
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}

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void ir_set_throws_exception(ir_node *node, int throws_exception)
{
	except_attr *attr = &node->attr.except;
	assert(is_fragile_op(node));
	attr->throws_exception = throws_exception;
}

int ir_throws_exception(const ir_node *node)
{
	const except_attr *attr = &node->attr.except;
	assert(is_fragile_op(node));
	return attr->throws_exception;
}

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size_t get_ASM_n_output_constraints(const ir_node *node)
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{
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	assert(is_ASM(node));
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	return ARR_LEN(node->attr.assem.output_constraints);
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}
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size_t get_ASM_n_clobbers(const ir_node *node)
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{
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	assert(is_ASM(node));
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	return ARR_LEN(node->attr.assem.clobbers);
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}

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ir_graph *(get_irn_irg)(const ir_node *node)
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{
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	return get_irn_irg_(node);
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}

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ir_node *skip_Proj(ir_node *node)
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{
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	if (is_Proj(node))
		node = get_Proj_pred(node);
	return node;
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}

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const ir_node *skip_Proj_const(const ir_node *node)
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{
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	if (is_Proj(node))
		node = get_Proj_pred(node);
	return node;
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}

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ir_node *skip_Tuple(ir_node *node)
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{
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restart:
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	if (is_Proj(node)) {
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		ir_node *pred = get_Proj_pred(node);
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		if (is_Proj(pred)) { /* nested Tuple ? */
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		    pred = skip_Tuple(pred);

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			if (is_Tuple(pred)) {
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				node = get_Tuple_pred(pred, get_Proj_num(node));
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				goto restart;
			}
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		} else if (is_Tuple(pred)) {
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			node = get_Tuple_pred(pred, get_Proj_num(node));
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			goto restart;
		}
	}
	return node;
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}

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ir_node *skip_Pin(ir_node *node)
{
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	if (is_Pin(node))
		return get_Pin_op(node);
	return node;
}

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ir_node *skip_Confirm(ir_node *node)
{
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	if (is_Confirm(node))
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		return get_Confirm_value(node);
	return node;
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}

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ir_node *skip_Id(ir_node *node)
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{
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	/* This should compact Id-cycles to self-cycles. It has the same (or less?) complexity
	 * than any other approach, as Id chains are resolved and all point to the real node, or
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	 * all id's are self loops. */
	if (node->op != op_Id)
		return node;
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	/* Don't use get_Id_pred():  We get into an endless loop for
	   self-referencing Ids. */
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	ir_node *pred = node->in[0+1];
	if (pred->op != op_Id)
		return pred;
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	if (node != pred) {  /* not a self referencing Id. Resolve Id chain. */
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		if (pred->op != op_Id)
			return pred; /* shortcut */
		ir_node *rem_pred = pred;
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		assert(get_irn_arity (node) > 0);
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		node->in[0+1] = node;   /* turn us into a self referencing Id:  shorten Id cycles. */
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		ir_node *res = skip_Id(rem_pred);
		/* self-loop */
		if (is_Id(res))
			return node;
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		node->in[0+1] = res;    /* Turn Id chain into Ids all referencing the chain end. */
		return res;
	} else {
		return node;
	}
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}

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int is_cfop(const ir_node *node)
{
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	if (is_fragile_op(node) && ir_throws_exception(node))
		return true;

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	return is_op_cfopcode(get_irn_op(node));
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}

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int is_unknown_jump(const ir_node *node)
{
	return is_op_unknown_jump(get_irn_op(node));
}

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int is_fragile_op(const ir_node *node)
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{
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	return is_op_fragile(get_irn_op(node));
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}
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int (is_irn_forking)(const ir_node *node)
{
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	return is_irn_forking_(<