--- /dev/null
+/*
+ * Copyright (C) 1995-2007 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.
+ */
+
+/**
+ * @file
+ * @author Matthias Braun, Christoph Mallon
+ * @version $Id$
+ */
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <stdlib.h>
+
+#include "irnode_t.h"
+#include "ircons_t.h"
+#include "irgwalk.h"
+#include "irtools.h"
+#include "tv.h"
+#include "error.h"
+#include "lowering.h"
+
+static ir_mode *lowered_mode = NULL;
+static int lower_direct_cmp = 0;
+
+static ir_node *create_not(dbg_info *dbgi, ir_node *node)
+{
+ ir_graph *irg = current_ir_graph;
+ ir_node *block = get_nodes_block(node);
+ tarval *tv_one = get_tarval_one(lowered_mode);
+ ir_node *one = new_d_Const(dbgi, lowered_mode, tv_one);
+
+ return new_rd_Eor(dbgi, irg, block, node, one, lowered_mode);
+}
+
+static int is_Const_0(const ir_node *node)
+{
+ tarval *tv;
+
+ if(!is_Const(node))
+ return 0;
+
+ tv = get_Const_tarval(node);
+ return tarval_is_null(tv);
+}
+
+static ir_node *lower_node(ir_node *node)
+{
+ ir_graph *irg = current_ir_graph;
+ dbg_info *dbgi = get_irn_dbg_info(node);
+ ir_op *op = get_irn_op(node);
+ ir_node *block = get_nodes_block(node);
+
+ assert(get_irn_mode(node) == mode_b);
+
+ /* TODO: be robust against phi-loops... */
+
+ if(op == op_And || op == op_Or || op == op_Eor || op == op_Phi) {
+ int i, arity;
+ ir_node *copy = exact_copy(node);
+
+ arity = get_irn_arity(node);
+ for(i = 0; i < arity; ++i) {
+ ir_node *in = get_irn_n(node, i);
+ ir_node *low_in = lower_node(in);
+
+ set_irn_n(copy, i, low_in);
+ }
+ set_irn_mode(copy, lowered_mode);
+ return copy;
+ }
+ if(op == op_Not) {
+ ir_node *op = get_Not_op(node);
+ ir_node *low_op = lower_node(op);
+
+ return create_not(dbgi, low_op);
+ }
+ if(op == op_Psi) {
+ ir_node *cond = get_Psi_cond(node, 0);
+ ir_node *low_cond = lower_node(cond);
+ ir_node *v_true = get_Psi_val(node, 0);
+ ir_node *low_v_true = lower_node(v_true);
+ ir_node *v_false = get_Psi_default(node);
+ ir_node *low_v_false = lower_node(v_false);
+
+ ir_node *and0 = new_rd_And(dbgi, irg, block, cond, low_v_true,
+ lowered_mode);
+
+ ir_node *not_cond = create_not(dbgi, low_cond);
+
+ ir_node *and1 = new_rd_And(dbgi, irg, block, not_cond, low_v_false,
+ lowered_mode);
+
+ ir_node *or = new_rd_Or(dbgi, irg, block, and0, and1,
+ lowered_mode);
+
+ return or;
+ }
+ if(op == op_Conv) {
+ tarval *tv_one = get_tarval_one(lowered_mode);
+ ir_node *one = new_d_Const(dbgi, lowered_mode, tv_one);
+ tarval *tv_zero = get_tarval_null(lowered_mode);
+ ir_node *zero = new_d_Const(dbgi, lowered_mode, tv_zero);
+ ir_mode *mode = get_irn_mode(node);
+ tarval *tv_zeroc = get_tarval_null(mode);
+ ir_node *zero_cmp = new_d_Const(dbgi, mode, tv_zeroc);
+
+ ir_node *cmp = new_rd_Cmp(dbgi, irg, block, node, zero_cmp);
+ ir_node *proj = new_rd_Proj(dbgi, irg, block, cmp, mode_b,
+ pn_Cmp_Lg);
+ ir_node *vals[2] = { one, zero };
+ ir_node *psi = new_rd_Psi(dbgi, irg, block, 1, &proj, vals,
+ lowered_mode);
+
+ return psi;
+ }
+ if(op == op_Proj) {
+ ir_node *pred = get_Proj_pred(node);
+
+ assert(!is_Load(pred));
+ if(is_Cmp(pred)) {
+ ir_mode *mode = get_irn_mode(pred);
+ ir_node *left = get_Cmp_left(pred);
+ ir_node *right = get_Cmp_right(pred);
+
+ if(get_mode_size_bits(mode) < get_mode_size_bits(lowered_mode)
+ || is_Const_0(right)) {
+ int pnc = get_Proj_proj(node);
+ ir_node *res = NULL;
+ int need_not = 0;
+ ir_node *a = NULL;
+ ir_node *b = NULL;
+
+ if(pnc == pn_Cmp_Lt) {
+ /* a < b -> (a - b) >> 31 */
+ a = left;
+ b = right;
+ } else if(pnc == pn_Cmp_Le) {
+ /* a <= b -> ((a - b) >> 31) ^ 1 */
+ a = right;
+ b = left;
+ need_not = 1;
+ } else if(pnc == pn_Cmp_Gt) {
+ /* a > b -> (b - a) >> 31 */
+ a = right;
+ b = left;
+ } else if(pnc == pn_Cmp_Ge) {
+ /* a >= b -> ((a - b) >> 31) ^ 1 */
+ a = left;
+ b = right;
+ need_not = 1;
+ }
+
+ if(a != NULL) {
+ tarval *tv = new_tarval_from_long(31, mode_Iu);
+ ir_node *shift_cnt = new_d_Const(dbgi, mode_Iu, tv);
+
+ if(mode != lowered_mode) {
+ a = new_rd_Conv(dbgi, irg, block, a, lowered_mode);
+ b = new_rd_Conv(dbgi, irg, block, b, lowered_mode);
+ }
+
+ res = new_rd_Sub(dbgi, irg, block, a, b, lowered_mode);
+ res = new_rd_Shr(dbgi, irg, block, res, shift_cnt,
+ lowered_mode);
+
+ if(need_not) {
+ res = create_not(dbgi, res);
+ }
+ return res;
+ }
+ }
+
+ {
+ /* synthesize the 0/1 value */
+ tarval *tv_one = get_tarval_one(lowered_mode);
+ ir_node *one = new_d_Const(dbgi, lowered_mode, tv_one);
+ tarval *tv_zero = get_tarval_null(lowered_mode);
+ ir_node *zero = new_d_Const(dbgi, lowered_mode, tv_zero);
+
+ ir_node *vals[2] = { one, zero };
+ ir_node *psi = new_rd_Psi(dbgi, irg, block, 1, &node, vals,
+ lowered_mode);
+
+ return psi;
+ }
+ }
+
+ panic("unexpected projb: %+F (pred: %+F)", node, pred);
+ set_irn_mode(node, lowered_mode);
+ return node;
+ }
+ if(op == op_Const) {
+ tarval *tv = get_Const_tarval(node);
+ if(tv == get_tarval_b_true()) {
+ tarval *tv_one = get_tarval_one(lowered_mode);
+ ir_node *one = new_d_Const(dbgi, lowered_mode, tv_one);
+ return one;
+ } else if(tv == get_tarval_b_false()) {
+ tarval *tv_zero = get_tarval_null(lowered_mode);
+ ir_node *zero = new_d_Const(dbgi, lowered_mode, tv_zero);
+ return zero;
+ } else {
+ panic("invalid boolean const %+F", node);
+ }
+ }
+
+ panic("didn't expect %+F to have mode_b", node);
+}
+
+static ir_node *create_convb(ir_node *node)
+{
+ ir_graph *irg = current_ir_graph;
+ ir_node *block = get_nodes_block(node);
+ ir_node *conv = new_rd_Conv(NULL, irg, block, node, mode_b);
+
+ return conv;
+}
+
+static void lower_mode_b_walker(ir_node *node, void *env)
+{
+ int i, arity;
+ (void) env;
+
+ arity = get_irn_arity(node);
+ for(i = 0; i < arity; ++i) {
+ ir_node *lowered_in;
+ ir_node *in = get_irn_n(node, i);
+ if(get_irn_mode(in) != mode_b)
+ continue;
+
+ if(! lower_direct_cmp) {
+ if(is_Cond(node)
+ || (is_Psi(node) && get_irn_mode(node) != mode_b)) {
+ if(is_Proj(in)) {
+ ir_node *pred = get_Proj_pred(in);
+ if(is_Cmp(pred))
+ continue;
+ }
+ }
+ }
+
+ lowered_in = lower_node(in);
+ lowered_in = create_convb(lowered_in);
+ set_irn_n(node, i, lowered_in);
+ }
+}
+
+void ir_lower_mode_b(ir_graph *irg, ir_mode *mode, int do_lower_direct_cmp)
+{
+ lowered_mode = mode;
+ lower_direct_cmp = do_lower_direct_cmp;
+ irg_walk_graph(irg, lower_mode_b_walker, NULL, NULL);
+}
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