Commit f8c684c7 authored by Matthias Braun's avatar Matthias Braun
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oops, forgot to add a file

parent a00e3544
* Copyright (C) 1995-2011 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
* @file
* @brief lower mode_b operations to something the backend can handle
* @author Matthias Braun, Christoph Mallon
* @version $Id$
* Most machines can't really manipulate mode_b values (which are usually
* modeled as cpu flags). So you often have to convert them into machine words
* with the values 0/1 and operate on them instead.
* After this pass the following holds:
* - The only inputs with mode_b are for the Cond node and the Sel input of
* a Mux node.
* - The only nodes producing mode_b are: Proj(Cmp)
#include "firm_types.h"
* Function which creates a "set" instraction. A "set" instruction takes a
* condition value (a value with mode_b) as input and produces a value in a
* general purpose integer mode.
* Most architectures have special intrinsics for this. But if all else fails
* you can just produces the an if-like construct.
typedef ir_node* (*create_set_func)(ir_node *cond);
* implementation of create_set_func which produces a cond with control
* flow
ir_node *ir_create_cond_set(ir_node *cond, ir_mode *dest_mode);
typedef struct lower_mode_b_config_t {
/* mode that is used to transport 0/1 values */
ir_mode *lowered_mode;
/* callback for creating set-like instructions */
create_set_func create_set;
} lower_mode_b_config_t;
* Lowers mode_b operations to integer arithmetic. After the lowering the only
* operations with mode_b are the Projs of Cmps; the only nodes with mode_b
* inputs are Cond and Psi nodes.
* Example: Psi(a < 0, 1, 0) => a >> 31
* @param irg the firm graph to lower
* @param config configuration for mode_b lowerer
void ir_lower_mode_b(ir_graph *irg, const lower_mode_b_config_t *config);
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