From: Matthias Braun Date: Tue, 10 Jul 2007 14:58:55 +0000 (+0000) Subject: add mode_b lowering X-Git-Url: http://nsz.repo.hu/git/?a=commitdiff_plain;h=e4b4f2037339baea3b335721c7953eddea8d748c;p=libfirm add mode_b lowering [r15001] --- diff --git a/ir/lower/lower_mode_b.c b/ir/lower/lower_mode_b.c new file mode 100644 index 000000000..aceae3f50 --- /dev/null +++ b/ir/lower/lower_mode_b.c @@ -0,0 +1,270 @@ +/* + * 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 + +#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); +}