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Add BLIF support for ternary (MUX) operators.

This commit is contained in:
Stephen Williams 2013-07-31 20:38:20 -07:00
parent 999a53ab75
commit 6684b2db04
4 changed files with 62 additions and 1 deletions
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2
tgt-blif/Makefile.in
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@ -45,7 +45,7 @@ CXXFLAGS = @WARNING_FLAGS@ @CXXFLAGS@
LDFLAGS = @LDFLAGS@
O = blif.o constants.o logic_gate.o lpm.o lpm_add.o lpm_cmp_eq.o lpm_cmp_gt.o \
lpm_part_vp.o lpm_re_logic.o nex_data.o
lpm_mux.o lpm_part_vp.o lpm_re_logic.o nex_data.o
all: dep blif.tgt

3
tgt-blif/lpm.cc
View File

@ -88,6 +88,9 @@ int print_lpm(FILE*fd, ivl_lpm_t net)
case IVL_LPM_CMP_NEE:
rc += print_lpm_cmp_ne(fd, net);
break;
case IVL_LPM_MUX:
rc += print_lpm_mux(fd, net);
break;
case IVL_LPM_PART_VP:
rc += print_lpm_part_vp(fd, net);
break;

57
tgt-blif/lpm_mux.cc Normal file
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@ -0,0 +1,57 @@
/*
* Copyright (c) 2013 Stephen Williams (steve@icarus.com)
*
* This source code is free software; you can redistribute it
* and/or modify it in source code form under the terms of the GNU
* General Public License as published by the Free Software
* Foundation; either version 2 of the License, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
# include "priv.h"
# include "nex_data.h"
# include <cassert>
int print_lpm_mux(FILE*fd, ivl_lpm_t net)
{
ivl_nexus_t nex_out = ivl_lpm_q(net);
blif_nex_data_t*ned_out = blif_nex_data_t::get_nex_data(nex_out);
ivl_nexus_t nex_sel = ivl_lpm_select(net);
blif_nex_data_t*ned_sel = blif_nex_data_t::get_nex_data(nex_sel);
ivl_nexus_t nex_d0 = ivl_lpm_data(net,0);
blif_nex_data_t*ned_d0 = blif_nex_data_t::get_nex_data(nex_d0);
ivl_nexus_t nex_d1 = ivl_lpm_data(net,1);
blif_nex_data_t*ned_d1 = blif_nex_data_t::get_nex_data(nex_d1);
assert(ivl_lpm_width(net) == ned_out->get_width());
assert(ivl_lpm_width(net) == ned_d0->get_width());
assert(ivl_lpm_width(net) == ned_d1->get_width());
// Only support single-bit select
assert(ned_sel->get_width() == 1);
for (unsigned idx = 0 ; idx < ivl_lpm_width(net) ; idx += 1) {
fprintf(fd, ".names %s%s %s%s %s%s %s%s\n"
"01- 1\n"
"1-1 1\n",
ned_sel->get_name(), ned_sel->get_name_index(0),
ned_d0->get_name(), ned_d0->get_name_index(idx),
ned_d1->get_name(), ned_d1->get_name_index(idx),
ned_out->get_name(), ned_out->get_name_index(idx));
}
return 0;
}

1
tgt-blif/priv.h
View File

@ -36,6 +36,7 @@ extern int print_lpm_sub(FILE*fd, ivl_lpm_t net);
extern int print_lpm_cmp_eq(FILE*fd, ivl_lpm_t net);
extern int print_lpm_cmp_gt(FILE*fd, ivl_lpm_t net);
extern int print_lpm_cmp_ne(FILE*fd, ivl_lpm_t net);
extern int print_lpm_mux(FILE*fd, ivl_lpm_t net);
extern int print_lpm_part_vp(FILE*fd, ivl_lpm_t net);
extern int print_lpm_re_logic(FILE*fd, ivl_lpm_t net);