aboutsummaryrefslogtreecommitdiffstats
path: root/passes/techmap/simplemap.h
blob: c2d73ea791159dbbf248f9a6d4ee47fea444d2a4 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
/*
 *  yosys -- Yosys Open SYnthesis Suite
 *
 *  Copyright (C) 2012  Clifford Wolf <clifford@clifford.at>
 *
 *  Permission to use, copy, modify, and/or distribute this software for any
 *  purpose with or without fee is hereby granted, provided that the above
 *  copyright notice and this permission notice appear in all copies.
 *
 *  THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 *  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 *  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 *  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 *  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 *  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 *  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 */

#ifndef SIMPLEMAP_H
#define SIMPLEMAP_H

#include "kernel/yosys.h"

YOSYS_NAMESPACE_BEGIN

extern void simplemap_not(RTLIL::Module *module, RTLIL::Cell *cell);
extern void simplemap_pos(RTLIL::Module *module, RTLIL::Cell *cell);
extern void simplemap_bitop(RTLIL::Module *module, RTLIL::Cell *cell);
extern void simplemap_reduce(RTLIL::Module *module, RTLIL::Cell *cell);
extern void simplemap_lognot(RTLIL::Module *module, RTLIL::Cell *cell);
extern void simplemap_logbin(RTLIL::Module *module, RTLIL::Cell *cell);
extern void simplemap_mux(RTLIL::Module *module, RTLIL::Cell *cell);
extern void simplemap_lut(RTLIL::Module *module, RTLIL::Cell *cell);
extern void simplemap_slice(RTLIL::Module *module, RTLIL::Cell *cell);
extern void simplemap_concat(RTLIL::Module *module, RTLIL::Cell *cell);
extern void simplemap_sr(RTLIL::Module *module, RTLIL::Cell *cell);
extern void simplemap_dff(RTLIL::Module *module, RTLIL::Cell *cell);
extern void simplemap_dffe(RTLIL::Module *module, RTLIL::Cell *cell);
extern void simplemap_dffsr(RTLIL::Module *module, RTLIL::Cell *cell);
extern void simplemap_adff(RTLIL::Module *module, RTLIL::Cell *cell);
extern void simplemap_dlatch(RTLIL::Module *module, RTLIL::Cell *cell);
extern void simplemap(RTLIL::Module *module, RTLIL::Cell *cell);

extern void simplemap_get_mappers(std::map<RTLIL::IdString, void(*)(RTLIL::Module*, RTLIL::Cell*)> &mappers);

YOSYS_NAMESPACE_END

#endif
href='#n512'>512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834
/*
 *  yosys -- Yosys Open SYnthesis Suite
 *
 *  Copyright (C) 2012  Claire Xenia Wolf <claire@yosyshq.com>
 *
 *  Permission to use, copy, modify, and/or distribute this software for any
 *  purpose with or without fee is hereby granted, provided that the above
 *  copyright notice and this permission notice appear in all copies.
 *
 *  THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 *  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 *  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 *  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 *  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 *  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 *  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 */

#include "kernel/rtlil.h"
#include "kernel/register.h"
#include "kernel/sigtools.h"
#include "kernel/celltypes.h"
#include "kernel/log.h"
#include <string>

USING_YOSYS_NAMESPACE
PRIVATE_NAMESPACE_BEGIN

struct SmvWorker
{
	CellTypes ct;
	SigMap sigmap;
	RTLIL::Module *module;
	std::ostream &f;
	bool verbose;

	int idcounter;
	dict<IdString, shared_str> idcache;
	pool<shared_str> used_names;
	vector<shared_str> strbuf;

	pool<Wire*> partial_assignment_wires;
	dict<SigBit, std::pair<const char*, int>> partial_assignment_bits;
	vector<string> inputvars, vars, definitions, assignments, invarspecs;

	const char *cid()
	{
		while (true) {
			shared_str s(stringf("_%d", idcounter++));
			if (!used_names.count(s)) {
				used_names.insert(s);
				return s.c_str();
			}
		}
	}

	const char *cid(IdString id, bool precache = false)
	{
		if (!idcache.count(id))
		{
			string name = stringf("_%s", id.c_str());

			if (name.compare(0, 2, "_\\") == 0)
				name = "_" + name.substr(2);

			for (auto &c : name) {
				if (c == '|' || c == '$' || c == '_') continue;
				if (c >= 'a' && c <='z') continue;
				if (c >= 'A' && c <='Z') continue;
				if (c >= '0' && c <='9') continue;
				if (precache) return nullptr;
				c = '#';
			}

			if (name == "_main")
				name = "main";

			while (used_names.count(name))
				name += "_";

			shared_str s(name);
			used_names.insert(s);
			idcache[id] = s;
		}

		return idcache.at(id).c_str();
	}

	SmvWorker(RTLIL::Module *module, bool verbose, std::ostream &f) :
			ct(module->design), sigmap(module), module(module), f(f), verbose(verbose), idcounter(0)
	{
		for (auto mod : module->design->modules())
			cid(mod->name, true);

		for (auto wire : module->wires())
			cid(wire->name, true);

		for (auto cell : module->cells()) {
			cid(cell->name, true);
			cid(cell->type, true);
			for (auto &conn : cell->connections())
				cid(conn.first, true);
		}
	}

	const char *rvalue(SigSpec sig, int width = -1, bool is_signed = false)
	{
		string s;
		int count_chunks = 0;
		sigmap.apply(sig);

		for (int i = 0; i < GetSize(sig); i++)
			if (partial_assignment_bits.count(sig[i]))
			{
				int width = 1;
				const auto &bit_a = partial_assignment_bits.at(sig[i]);

				while (i+width < GetSize(sig))
				{
					if (!partial_assignment_bits.count(sig[i+width]))
						break;

					const auto &bit_b = partial_assignment_bits.at(sig[i+width]);
					if (strcmp(bit_a.first, bit_b.first))
						break;
					if (bit_a.second+width != bit_b.second)
						break;

					width++;
				}

				if (i+width < GetSize(sig))
					s = stringf("%s :: ", rvalue(sig.extract(i+width, GetSize(sig)-(width+i))));

				s += stringf("%s[%d:%d]", bit_a.first, bit_a.second+width-1, bit_a.second);

				if (i > 0)
					s += stringf(" :: %s", rvalue(sig.extract(0, i)));

				count_chunks = 3;
				goto continue_with_resize;
			}

		for (auto &c : sig.chunks()) {
			count_chunks++;
			if (!s.empty())
				s = " :: " + s;
			if (c.wire) {
				if (c.offset != 0 || c.width != c.wire->width)
					s = stringf("%s[%d:%d]", cid(c.wire->name), c.offset+c.width-1, c.offset) + s;
				else
					s = cid(c.wire->name) + s;
			} else {
				string v = stringf("0ub%d_", c.width);
				for (int i = c.width-1; i >= 0; i--)
					v += c.data.at(i) == State::S1 ? '1' : '0';
				s = v + s;
			}
		}

	continue_with_resize:;
		if (width >= 0) {
			if (is_signed) {
				if (GetSize(sig) > width)
					s = stringf("signed(resize(%s, %d))", s.c_str(), width);
				else
					s = stringf("resize(signed(%s), %d)", s.c_str(), width);
			} else
				s = stringf("resize(%s, %d)", s.c_str(), width);
		} else if (is_signed)
			s = stringf("signed(%s)", s.c_str());
		else if (count_chunks > 1)
			s = stringf("(%s)", s.c_str());

		strbuf.push_back(s);
		return strbuf.back().c_str();
	}

	const char *rvalue_u(SigSpec sig, int width = -1)
	{
		return rvalue(sig, width, false);
	}

	const char *rvalue_s(SigSpec sig, int width = -1, bool is_signed = true)
	{
		return rvalue(sig, width, is_signed);
	}

	const char *lvalue(SigSpec sig)
	{
		sigmap.apply(sig);

		if (sig.is_wire())
			return rvalue(sig);

		const char *temp_id = cid();
//		f << stringf("    %s : unsigned word[%d]; -- %s\n", temp_id, GetSize(sig), log_signal(sig));

		int offset = 0;
		for (auto bit : sig) {
			log_assert(bit.wire != nullptr);
			partial_assignment_wires.insert(bit.wire);
			partial_assignment_bits[bit] = std::pair<const char*, int>(temp_id, offset++);
		}

		return temp_id;
	}

	void run()
	{
		f << stringf("MODULE %s\n", cid(module->name));

		for (auto wire : module->wires())
		{
			if (SigSpec(wire) != sigmap(wire))
				partial_assignment_wires.insert(wire);

			if (wire->port_input)
				inputvars.push_back(stringf("%s : unsigned word[%d]; -- %s", cid(wire->name), wire->width, log_id(wire)));

			if (wire->attributes.count(ID::init))
				assignments.push_back(stringf("init(%s) := %s;", lvalue(wire), rvalue(wire->attributes.at(ID::init))));
		}

		for (auto cell : module->cells())
		{
			// FIXME: $slice, $concat, $mem

			if (cell->type.in(ID($assert)))
			{
				SigSpec sig_a = cell->getPort(ID::A);
				SigSpec sig_en = cell->getPort(ID::EN);

				invarspecs.push_back(stringf("!bool(%s) | bool(%s);", rvalue(sig_en), rvalue(sig_a)));

				continue;
			}

			if (cell->type.in(ID($shl), ID($shr), ID($sshl), ID($sshr), ID($shift), ID($shiftx)))
			{
				SigSpec sig_a = cell->getPort(ID::A);
				SigSpec sig_b = cell->getPort(ID::B);

				int width_y = GetSize(cell->getPort(ID::Y));
				int shift_b_width = GetSize(sig_b);
				int width_ay = max(GetSize(sig_a), width_y);
				int width = width_ay;

				for (int i = 1, j = 0;; i <<= 1, j++)
					if (width_ay < i) {
						width = i-1;
						shift_b_width = min(shift_b_width, j);
						break;
					}

				bool signed_a = cell->getParam(ID::A_SIGNED).as_bool();
				bool signed_b = cell->getParam(ID::B_SIGNED).as_bool();
				string op = cell->type.in(ID($shl), ID($sshl)) ? "<<" : ">>";
				string expr, expr_a;

				if (cell->type == ID($sshr) && signed_a)
				{
					expr_a = rvalue_s(sig_a, width);
					expr = stringf("resize(unsigned(%s %s %s), %d)", expr_a.c_str(), op.c_str(), rvalue(sig_b.extract(0, shift_b_width)), width_y);
					if (shift_b_width < GetSize(sig_b))
						expr = stringf("%s != 0ud%d_0 ? (bool(%s) ? !0ud%d_0 : 0ud%d_0) : %s",
								rvalue(sig_b.extract(shift_b_width, GetSize(sig_b) - shift_b_width)), GetSize(sig_b) - shift_b_width,
								rvalue(sig_a[GetSize(sig_a)-1]), width_y, width_y, expr.c_str());
				}
				else if (cell->type.in(ID($shift), ID($shiftx)) && signed_b)
				{
					expr_a = rvalue_u(sig_a, width);

					const char *b_shr = rvalue_u(sig_b);
					const char *b_shl = cid();

//					f << stringf("    %s : unsigned word[%d]; -- neg(%s)\n", b_shl, GetSize(sig_b), log_signal(sig_b));
					definitions.push_back(stringf("%s := unsigned(-%s);", b_shl, rvalue_s(sig_b)));

					string expr_shl = stringf("resize(%s << %s[%d:0], %d)", expr_a.c_str(), b_shl, shift_b_width-1, width_y);
					string expr_shr = stringf("resize(%s >> %s[%d:0], %d)", expr_a.c_str(), b_shr, shift_b_width-1, width_y);

					if (shift_b_width < GetSize(sig_b)) {
						expr_shl = stringf("%s[%d:%d] != 0ud%d_0 ? 0ud%d_0 : %s", b_shl, GetSize(sig_b)-1, shift_b_width,
								GetSize(sig_b)-shift_b_width, width_y, expr_shl.c_str());
						expr_shr = stringf("%s[%d:%d] != 0ud%d_0 ? 0ud%d_0 : %s", b_shr, GetSize(sig_b)-1, shift_b_width,
								GetSize(sig_b)-shift_b_width, width_y, expr_shr.c_str());
					}

					expr = stringf("bool(%s) ? %s : %s", rvalue(sig_b[GetSize(sig_b)-1]), expr_shl.c_str(), expr_shr.c_str());
				}
				else
				{
					if (cell->type.in(ID($shift), ID($shiftx)) || !signed_a)
						expr_a = rvalue_u(sig_a, width);
					else
						expr_a = stringf("resize(unsigned(%s), %d)", rvalue_s(sig_a, width_ay), width);

					expr = stringf("resize(%s %s %s[%d:0], %d)", expr_a.c_str(), op.c_str(), rvalue_u(sig_b), shift_b_width-1, width_y);
					if (shift_b_width < GetSize(sig_b))
						expr = stringf("%s[%d:%d] != 0ud%d_0 ? 0ud%d_0 : %s", rvalue_u(sig_b), GetSize(sig_b)-1, shift_b_width,
								GetSize(sig_b)-shift_b_width, width_y, expr.c_str());
				}

				definitions.push_back(stringf("%s := %s;", lvalue(cell->getPort(ID::Y)), expr.c_str()));

				continue;
			}

			if (cell->type.in(ID($not), ID($pos), ID($neg)))
			{
				int width = GetSize(cell->getPort(ID::Y));
				string expr_a, op;

				if (cell->type == ID($not))  op = "!";
				if (cell->type == ID($pos))  op = "";
				if (cell->type == ID($neg))  op = "-";

				if (cell->getParam(ID::A_SIGNED).as_bool())
				{
					definitions.push_back(stringf("%s := unsigned(%s%s);", lvalue(cell->getPort(ID::Y)),
							op.c_str(), rvalue_s(cell->getPort(ID::A), width)));
				}
				else
				{
					definitions.push_back(stringf("%s := %s%s;", lvalue(cell->getPort(ID::Y)),
							op.c_str(), rvalue_u(cell->getPort(ID::A), width)));
				}

				continue;
			}

			if (cell->type.in(ID($add), ID($sub), ID($mul), ID($and), ID($or), ID($xor), ID($xnor)))
			{
				int width = GetSize(cell->getPort(ID::Y));
				string expr_a, expr_b, op;

				if (cell->type == ID($add))  op = "+";
				if (cell->type == ID($sub))  op = "-";
				if (cell->type == ID($mul))  op = "*";
				if (cell->type == ID($and))  op = "&";
				if (cell->type == ID($or))   op = "|";
				if (cell->type == ID($xor))  op = "xor";
				if (cell->type == ID($xnor)) op = "xnor";

				if (cell->getParam(ID::A_SIGNED).as_bool())
				{
					definitions.push_back(stringf("%s := unsigned(%s %s %s);", lvalue(cell->getPort(ID::Y)),
							rvalue_s(cell->getPort(ID::A), width), op.c_str(), rvalue_s(cell->getPort(ID::B), width)));
				}
				else
				{
					definitions.push_back(stringf("%s := %s %s %s;", lvalue(cell->getPort(ID::Y)),
							rvalue_u(cell->getPort(ID::A), width), op.c_str(), rvalue_u(cell->getPort(ID::B), width)));
				}

				continue;
			}

			// SMV has a "mod" operator, but its semantics don't seem to be well-defined - to be safe, don't generate it at all
			if (cell->type.in(ID($div)/*, ID($mod), ID($modfloor)*/))
			{
				int width_y = GetSize(cell->getPort(ID::Y));
				int width = max(width_y, GetSize(cell->getPort(ID::A)));
				width = max(width, GetSize(cell->getPort(ID::B)));
				string expr_a, expr_b, op;

				if (cell->type == ID($div))  op = "/";
				//if (cell->type == ID($mod))  op = "mod";

				if (cell->getParam(ID::A_SIGNED).as_bool())
				{
					definitions.push_back(stringf("%s := resize(unsigned(%s %s %s), %d);", lvalue(cell->getPort(ID::Y)),
							rvalue_s(cell->getPort(ID::A), width), op.c_str(), rvalue_s(cell->getPort(ID::B), width), width_y));
				}
				else
				{
					definitions.push_back(stringf("%s := resize(%s %s %s, %d);", lvalue(cell->getPort(ID::Y)),
							rvalue_u(cell->getPort(ID::A), width), op.c_str(), rvalue_u(cell->getPort(ID::B), width), width_y));
				}

				continue;
			}

			if (cell->type.in(ID($eq), ID($ne), ID($eqx), ID($nex), ID($lt), ID($le), ID($ge), ID($gt)))
			{
				int width = max(GetSize(cell->getPort(ID::A)), GetSize(cell->getPort(ID::B)));
				string expr_a, expr_b, op;

				if (cell->type == ID($eq))  op = "=";
				if (cell->type == ID($ne))  op = "!=";
				if (cell->type == ID($eqx)) op = "=";
				if (cell->type == ID($nex)) op = "!=";
				if (cell->type == ID($lt))  op = "<";
				if (cell->type == ID($le))  op = "<=";
				if (cell->type == ID($ge))  op = ">=";
				if (cell->type == ID($gt))  op = ">";

				if (cell->getParam(ID::A_SIGNED).as_bool())
				{
					expr_a = stringf("resize(signed(%s), %d)", rvalue(cell->getPort(ID::A)), width);
					expr_b = stringf("resize(signed(%s), %d)", rvalue(cell->getPort(ID::B)), width);
				}
				else
				{
					expr_a = stringf("resize(%s, %d)", rvalue(cell->getPort(ID::A)), width);
					expr_b = stringf("resize(%s, %d)", rvalue(cell->getPort(ID::B)), width);
				}

				definitions.push_back(stringf("%s := resize(word1(%s %s %s), %d);", lvalue(cell->getPort(ID::Y)),
						expr_a.c_str(), op.c_str(), expr_b.c_str(), GetSize(cell->getPort(ID::Y))));

				continue;
			}

			if (cell->type.in(ID($reduce_and), ID($reduce_or), ID($reduce_bool)))
			{
				int width_a = GetSize(cell->getPort(ID::A));
				int width_y = GetSize(cell->getPort(ID::Y));
				const char *expr_a = rvalue(cell->getPort(ID::A));
				const char *expr_y = lvalue(cell->getPort(ID::Y));
				string expr;

				if (cell->type == ID($reduce_and))  expr = stringf("%s = !0ub%d_0", expr_a, width_a);
				if (cell->type == ID($reduce_or))   expr = stringf("%s != 0ub%d_0", expr_a, width_a);
				if (cell->type == ID($reduce_bool)) expr = stringf("%s != 0ub%d_0", expr_a, width_a);

				definitions.push_back(stringf("%s := resize(word1(%s), %d);", expr_y, expr.c_str(), width_y));
				continue;
			}

			if (cell->type.in(ID($reduce_xor), ID($reduce_xnor)))
			{
				int width_y = GetSize(cell->getPort(ID::Y));
				const char *expr_y = lvalue(cell->getPort(ID::Y));
				string expr;

				for (auto bit : cell->getPort(ID::A)) {
					if (!expr.empty())
						expr += " xor ";
					expr += rvalue(bit);
				}

				if (cell->type == ID($reduce_xnor))
					expr = "!(" + expr + ")";

				definitions.push_back(stringf("%s := resize(%s, %d);", expr_y, expr.c_str(), width_y));
				continue;
			}

			if (cell->type.in(ID($logic_and), ID($logic_or)))
			{
				int width_a = GetSize(cell->getPort(ID::A));
				int width_b = GetSize(cell->getPort(ID::B));
				int width_y = GetSize(cell->getPort(ID::Y));

				string expr_a = stringf("(%s != 0ub%d_0)", rvalue(cell->getPort(ID::A)), width_a);
				string expr_b = stringf("(%s != 0ub%d_0)", rvalue(cell->getPort(ID::B)), width_b);
				const char *expr_y = lvalue(cell->getPort(ID::Y));

				string expr;
				if (cell->type == ID($logic_and)) expr = expr_a + " & " + expr_b;
				if (cell->type == ID($logic_or))  expr = expr_a + " | " + expr_b;

				definitions.push_back(stringf("%s := resize(word1(%s), %d);", expr_y, expr.c_str(), width_y));
				continue;
			}

			if (cell->type.in(ID($logic_not)))
			{
				int width_a = GetSize(cell->getPort(ID::A));
				int width_y = GetSize(cell->getPort(ID::Y));

				string expr_a = stringf("(%s = 0ub%d_0)", rvalue(cell->getPort(ID::A)), width_a);
				const char *expr_y = lvalue(cell->getPort(ID::Y));

				definitions.push_back(stringf("%s := resize(word1(%s), %d);", expr_y, expr_a.c_str(), width_y));
				continue;
			}

			if (cell->type.in(ID($mux), ID($pmux)))
			{
				int width = GetSize(cell->getPort(ID::Y));
				SigSpec sig_a = cell->getPort(ID::A);
				SigSpec sig_b = cell->getPort(ID::B);
				SigSpec sig_s = cell->getPort(ID::S);

				string expr;
				for (int i = 0; i < GetSize(sig_s); i++)
					expr += stringf("bool(%s) ? %s : ", rvalue(sig_s[i]), rvalue(sig_b.extract(i*width, width)));
				expr += rvalue(sig_a);

				definitions.push_back(stringf("%s := %s;", lvalue(cell->getPort(ID::Y)), expr.c_str()));
				continue;
			}

			if (cell->type == ID($dff))
			{
				vars.push_back(stringf("%s : unsigned word[%d]; -- %s", lvalue(cell->getPort(ID::Q)), GetSize(cell->getPort(ID::Q)), log_signal(cell->getPort(ID::Q))));
				assignments.push_back(stringf("next(%s) := %s;", lvalue(cell->getPort(ID::Q)), rvalue(cell->getPort(ID::D))));
				continue;
			}

			if (cell->type.in(ID($_BUF_), ID($_NOT_)))
			{
				string op = cell->type == ID($_NOT_) ? "!" : "";
				definitions.push_back(stringf("%s := %s%s;", lvalue(cell->getPort(ID::Y)), op.c_str(), rvalue(cell->getPort(ID::A))));
				continue;
			}

			if (cell->type.in(ID($_AND_), ID($_NAND_), ID($_OR_), ID($_NOR_), ID($_XOR_), ID($_XNOR_), ID($_ANDNOT_), ID($_ORNOT_)))
			{
				string op;

				if (cell->type.in(ID($_AND_), ID($_NAND_), ID($_ANDNOT_))) op = "&";
				if (cell->type.in(ID($_OR_), ID($_NOR_), ID($_ORNOT_))) op = "|";
				if (cell->type.in(ID($_XOR_)))  op = "xor";
				if (cell->type.in(ID($_XNOR_)))  op = "xnor";

				if (cell->type.in(ID($_ANDNOT_), ID($_ORNOT_)))
					definitions.push_back(stringf("%s := %s %s (!%s);", lvalue(cell->getPort(ID::Y)),
							rvalue(cell->getPort(ID::A)), op.c_str(), rvalue(cell->getPort(ID::B))));
				else
				if (cell->type.in(ID($_NAND_), ID($_NOR_)))
					definitions.push_back(stringf("%s := !(%s %s %s);", lvalue(cell->getPort(ID::Y)),
							rvalue(cell->getPort(ID::A)), op.c_str(), rvalue(cell->getPort(ID::B))));
				else
					definitions.push_back(stringf("%s := %s %s %s;", lvalue(cell->getPort(ID::Y)),
							rvalue(cell->getPort(ID::A)), op.c_str(), rvalue(cell->getPort(ID::B))));
				continue;
			}

			if (cell->type == ID($_MUX_))
			{
				definitions.push_back(stringf("%s := bool(%s) ? %s : %s;", lvalue(cell->getPort(ID::Y)),
						rvalue(cell->getPort(ID::S)), rvalue(cell->getPort(ID::B)), rvalue(cell->getPort(ID::A))));
				continue;
			}

			if (cell->type == ID($_NMUX_))
			{
				definitions.push_back(stringf("%s := !(bool(%s) ? %s : %s);", lvalue(cell->getPort(ID::Y)),
						rvalue(cell->getPort(ID::S)), rvalue(cell->getPort(ID::B)), rvalue(cell->getPort(ID::A))));
				continue;
			}

			if (cell->type == ID($_AOI3_))
			{
				definitions.push_back(stringf("%s := !((%s & %s) | %s);", lvalue(cell->getPort(ID::Y)),
						rvalue(cell->getPort(ID::A)), rvalue(cell->getPort(ID::B)), rvalue(cell->getPort(ID::C))));
				continue;
			}

			if (cell->type == ID($_OAI3_))
			{
				definitions.push_back(stringf("%s := !((%s | %s) & %s);", lvalue(cell->getPort(ID::Y)),
						rvalue(cell->getPort(ID::A)), rvalue(cell->getPort(ID::B)), rvalue(cell->getPort(ID::C))));
				continue;
			}

			if (cell->type == ID($_AOI4_))
			{
				definitions.push_back(stringf("%s := !((%s & %s) | (%s & %s));", lvalue(cell->getPort(ID::Y)),
						rvalue(cell->getPort(ID::A)), rvalue(cell->getPort(ID::B)), rvalue(cell->getPort(ID::C)), rvalue(cell->getPort(ID::D))));
				continue;
			}

			if (cell->type == ID($_OAI4_))
			{
				definitions.push_back(stringf("%s := !((%s | %s) & (%s | %s));", lvalue(cell->getPort(ID::Y)),
						rvalue(cell->getPort(ID::A)), rvalue(cell->getPort(ID::B)), rvalue(cell->getPort(ID::C)), rvalue(cell->getPort(ID::D))));
				continue;
			}

			if (cell->type[0] == '$') {
				if (cell->type.in(ID($dffe), ID($sdff), ID($sdffe), ID($sdffce)) || cell->type.str().substr(0, 6) == "$_SDFF" || (cell->type.str().substr(0, 6) == "$_DFFE" && cell->type.str().size() == 10)) {
					log_error("Unsupported cell type %s for cell %s.%s -- please run `dffunmap` before `write_smv`.\n",
							log_id(cell->type), log_id(module), log_id(cell));
				}
				if (cell->type.in(ID($adff), ID($adffe), ID($aldff), ID($aldffe), ID($dffsr), ID($dffsre)) || cell->type.str().substr(0, 5) == "$_DFF" || cell->type.str().substr(0, 7) == "$_ALDFF") {
					log_error("Unsupported cell type %s for cell %s.%s -- please run `async2sync; dffunmap` or `clk2fflogic` before `write_smv`.\n",
							log_id(cell->type), log_id(module), log_id(cell));
				}
				if (cell->type.in(ID($sr), ID($dlatch), ID($adlatch), ID($dlatchsr)) || cell->type.str().substr(0, 8) == "$_DLATCH" || cell->type.str().substr(0, 5) == "$_SR_") {
					log_error("Unsupported cell type %s for cell %s.%s -- please run `clk2fflogic` before `write_smv`.\n",
							log_id(cell->type), log_id(module), log_id(cell));
				}
				log_error("Unsupported cell type %s for cell %s.%s.\n",
						log_id(cell->type), log_id(module), log_id(cell));
			}

//			f << stringf("    %s : %s;\n", cid(cell->name), cid(cell->type));

			for (auto &conn : cell->connections())
				if (cell->output(conn.first))
					definitions.push_back(stringf("%s := %s.%s;", lvalue(conn.second), cid(cell->name), cid(conn.first)));
				else
					definitions.push_back(stringf("%s.%s := %s;", cid(cell->name), cid(conn.first), rvalue(conn.second)));
		}

		for (Wire *wire : partial_assignment_wires)
		{
			string expr;

			for (int i = 0; i < wire->width; i++)
			{
				if (!expr.empty())
					expr = " :: " + expr;

				if (partial_assignment_bits.count(sigmap(SigBit(wire, i))))
				{
					int width = 1;
					const auto &bit_a = partial_assignment_bits.at(sigmap(SigBit(wire, i)));

					while (i+1 < wire->width)
					{
						SigBit next_bit = sigmap(SigBit(wire, i+1));

						if (!partial_assignment_bits.count(next_bit))
							break;

						const auto &bit_b = partial_assignment_bits.at(next_bit);
						if (strcmp(bit_a.first, bit_b.first))
							break;
						if (bit_a.second+width != bit_b.second)
							break;

						width++, i++;
					}

					expr = stringf("%s[%d:%d]", bit_a.first, bit_a.second+width-1, bit_a.second) + expr;
				}
				else if (sigmap(SigBit(wire, i)).wire == nullptr)
				{
					string bits;
					SigSpec sig = sigmap(SigSpec(wire, i));

					while (i+1 < wire->width) {
						SigBit next_bit = sigmap(SigBit(wire, i+1));
						if (next_bit.wire != nullptr)
							break;
						sig.append(next_bit);
						i++;
					}

					for (int k = GetSize(sig)-1; k >= 0; k--)
						bits += sig[k] == State::S1 ? '1' : '0';

					expr = stringf("0ub%d_%s", GetSize(bits), bits.c_str()) + expr;
				}
				else if (sigmap(SigBit(wire, i)) == SigBit(wire, i))
				{
					int length = 1;

					while (i+1 < wire->width) {
						if (partial_assignment_bits.count(sigmap(SigBit(wire, i+1))))
							break;
						if (sigmap(SigBit(wire, i+1)) != SigBit(wire, i+1))
							break;
						i++, length++;
					}

					expr = stringf("0ub%d_0", length) + expr;
				}
				else
				{
					string bits;
					SigSpec sig = sigmap(SigSpec(wire, i));

					while (i+1 < wire->width) {
						SigBit next_bit = sigmap(SigBit(wire, i+1));
						if (next_bit.wire == nullptr || partial_assignment_bits.count(next_bit))
							break;
						sig.append(next_bit);
						i++;
					}

					expr = rvalue(sig) + expr;
				}
			}

			definitions.push_back(stringf("%s := %s;", cid(wire->name), expr.c_str()));
		}

		if (!inputvars.empty()) {
			f << stringf("  IVAR\n");
			for (const string &line : inputvars)
				f << stringf("    %s\n", line.c_str());
		}

		if (!vars.empty()) {
			f << stringf("  VAR\n");
			for (const string &line : vars)
				f << stringf("    %s\n", line.c_str());
		}

		if (!definitions.empty()) {
			f << stringf("  DEFINE\n");
			for (const string &line : definitions)
				f << stringf("    %s\n", line.c_str());
		}

		if (!assignments.empty()) {
			f << stringf("  ASSIGN\n");
			for (const string &line : assignments)
				f << stringf("    %s\n", line.c_str());
		}

		if (!invarspecs.empty()) {
			for (const string &line : invarspecs)
				f << stringf("  INVARSPEC %s\n", line.c_str());
		}
	}
};

struct SmvBackend : public Backend {
	SmvBackend() : Backend("smv", "write design to SMV file") { }
	void help() override
	{
		//   |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
		log("\n");
		log("    write_smv [options] [filename]\n");
		log("\n");
		log("Write an SMV description of the current design.\n");
		log("\n");
		log("    -verbose\n");
		log("        this will print the recursive walk used to export the modules.\n");
		log("\n");
		log("    -tpl <template_file>\n");
		log("        use the given template file. the line containing only the token '%%%%'\n");
		log("        is replaced with the regular output of this command.\n");
		log("\n");
		log("THIS COMMAND IS UNDER CONSTRUCTION\n");
		log("\n");
	}
	void execute(std::ostream *&f, std::string filename, std::vector<std::string> args, RTLIL::Design *design) override
	{
		std::ifstream template_f;
		bool verbose = false;

		log_header(design, "Executing SMV backend.\n");

		log_push();
		Pass::call(design, "bmuxmap");
		Pass::call(design, "demuxmap");
		log_pop();

		size_t argidx;
		for (argidx = 1; argidx < args.size(); argidx++)
		{
			if (args[argidx] == "-tpl" && argidx+1 < args.size()) {
				template_f.open(args[++argidx]);
				if (template_f.fail())
					log_error("Can't open template file `%s'.\n", args[argidx].c_str());
				continue;
			}
			if (args[argidx] == "-verbose") {
				verbose = true;
				continue;
			}
			break;
		}
		extra_args(f, filename, args, argidx);

		pool<Module*> modules;

		for (auto module : design->modules())
			if (!module->get_blackbox_attribute() && !module->has_memories_warn() && !module->has_processes_warn())
				modules.insert(module);

		if (template_f.is_open())
		{
			std::string line;
			while (std::getline(template_f, line))
			{
				int indent = 0;
				while (indent < GetSize(line) && (line[indent] == ' ' || line[indent] == '\t'))
					indent++;

				if (line[indent] == '%')
				{
					vector<string> stmt = split_tokens(line);

					if (GetSize(stmt) == 1 && stmt[0] == "%%")
						break;

					if (GetSize(stmt) == 2 && stmt[0] == "%module")
					{
						Module *module = design->module(RTLIL::escape_id(stmt[1]));
						modules.erase(module);

						if (module == nullptr)
							log_error("Module '%s' not found.\n", stmt[1].c_str());

						*f << stringf("-- SMV description generated by %s\n", yosys_version_str);

						log("Creating SMV representation of module %s.\n", log_id(module));
						SmvWorker worker(module, verbose, *f);
						worker.run();

						*f << stringf("-- end of yosys output\n");
						continue;
					}

					log_error("Unknown template statement: '%s'", line.c_str() + indent);
				}

				*f << line << std::endl;
			}
		}

		if (!modules.empty())
		{
			*f << stringf("-- SMV description generated by %s\n", yosys_version_str);

			for (auto module : modules) {
				log("Creating SMV representation of module %s.\n", log_id(module));
				SmvWorker worker(module, verbose, *f);
				worker.run();
			}

			*f << stringf("-- end of yosys output\n");
		}

		if (template_f.is_open()) {
			std::string line;
			while (std::getline(template_f, line))
				*f << line << std::endl;
		}
	}
} SmvBackend;

PRIVATE_NAMESPACE_END