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authorClifford Wolf <clifford@clifford.at>2014-09-07 18:23:04 +0200
committerClifford Wolf <clifford@clifford.at>2014-09-07 18:23:04 +0200
commit015dcdc84c5d0f9c899b520c9718ce32c9d2c8f7 (patch)
tree0db854e837c0ba4e2ec0c528cf8910900e299a8b
parent15b3c54fea80b7ccfd02c66c28ed38c610e23254 (diff)
Added "maccmap" command
-rw-r--r--passes/techmap/Makefile.inc1
-rw-r--r--passes/techmap/maccmap.cc318
2 files changed, 319 insertions, 0 deletions
diff --git a/passes/techmap/Makefile.inc b/passes/techmap/Makefile.inc
index b49259a8..da527ccf 100644
--- a/passes/techmap/Makefile.inc
+++ b/passes/techmap/Makefile.inc
@@ -8,6 +8,7 @@ ifneq ($(SMALL),1)
OBJS += passes/techmap/iopadmap.o
OBJS += passes/techmap/hilomap.o
OBJS += passes/techmap/extract.o
+OBJS += passes/techmap/maccmap.o
endif
GENFILES += passes/techmap/techmap.inc
diff --git a/passes/techmap/maccmap.cc b/passes/techmap/maccmap.cc
new file mode 100644
index 00000000..49850c0a
--- /dev/null
+++ b/passes/techmap/maccmap.cc
@@ -0,0 +1,318 @@
+/*
+ * 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.
+ *
+ */
+
+#include "kernel/yosys.h"
+#include "kernel/macc.h"
+
+extern void maccmap(RTLIL::Module *module, RTLIL::Cell *cell, bool unmap = false);
+
+struct MaccmapWorker
+{
+ std::vector<std::set<RTLIL::SigBit>> bits;
+ RTLIL::Module *module;
+ int width;
+
+ MaccmapWorker(RTLIL::Module *module, int width) : module(module), width(width)
+ {
+ bits.resize(width);
+ }
+
+ void add(RTLIL::SigBit bit, int position)
+ {
+ if (position >= width || bit == RTLIL::S0)
+ return;
+
+ if (bits.at(position).count(bit)) {
+ bits.at(position).erase(bit);
+ add(bit, position+1);
+ } else {
+ bits.at(position).insert(bit);
+ }
+ }
+
+ void add(RTLIL::SigSpec a, bool is_signed, bool do_subtract)
+ {
+ a.extend(width, is_signed);
+
+ if (do_subtract) {
+ a = module->Not(NEW_ID, a);
+ add(RTLIL::S1, 0);
+ }
+
+ for (int i = 0; i < width; i++)
+ add(a[i], i);
+ }
+
+ void add(RTLIL::SigSpec a, RTLIL::SigSpec b, bool is_signed, bool do_subtract)
+ {
+ if (SIZE(a) < SIZE(b))
+ std::swap(a, b);
+
+ a.extend(width, is_signed);
+
+ if (SIZE(b) > width)
+ b.extend(width, is_signed);
+
+ for (int i = 0; i < SIZE(b); i++)
+ if (is_signed && i+1 == SIZE(b))
+ {
+ a = {module->Not(NEW_ID, a.extract(i, width-i)), RTLIL::SigSpec(0, i)};
+ add(module->And(NEW_ID, a, RTLIL::SigSpec(b[i], width)), false, do_subtract);
+ add({b[i], RTLIL::SigSpec(0, i)}, false, do_subtract);
+ }
+ else
+ {
+ add(module->And(NEW_ID, a, RTLIL::SigSpec(b[i], width)), false, do_subtract);
+ a = {a.extract(0, width-1), RTLIL::S0};
+ }
+ }
+
+ void fulladd(RTLIL::SigSpec &in1, RTLIL::SigSpec &in2, RTLIL::SigSpec &in3, RTLIL::SigSpec &out1, RTLIL::SigSpec &out2)
+ {
+ RTLIL::SigSpec t1 = module->Xor(NEW_ID, in1, in2);
+ out1 = module->Xor(NEW_ID, t1, in3);
+
+ RTLIL::SigSpec t2 = module->And(NEW_ID, in1, in2);
+ RTLIL::SigSpec t3 = module->And(NEW_ID, in3, t1);
+ out2 = module->Or(NEW_ID, t2, t3);
+ }
+
+ int tree_bit_slots(int n)
+ {
+ #if 0
+ int retval = 0;
+ while (n > 2) {
+ retval += n / 3;
+ n = 2*(n / 3) + (n % 3);
+ }
+ return retval;
+ #else
+ return std::max(n - 2, 0);
+ #endif
+ }
+
+ RTLIL::SigSpec synth()
+ {
+ std::vector<RTLIL::SigSpec> summands;
+ std::vector<RTLIL::SigBit> tree_sum_bits;
+ int unique_tree_bits = 0;
+
+ while (1)
+ {
+ RTLIL::SigSpec summand(0, width);
+ bool got_data_bits = false;
+
+ for (int i = 0; i < width; i++)
+ if (!bits.at(i).empty()) {
+ auto it = bits.at(i).begin();
+ summand[i] = *it;
+ bits.at(i).erase(it);
+ got_data_bits = true;
+ }
+
+ if (!got_data_bits)
+ break;
+
+ summands.push_back(summand);
+ int free_bit_slots = tree_bit_slots(SIZE(summands)) - SIZE(tree_sum_bits);
+
+ for (int i = 0; i < width && (1 << i) <= free_bit_slots; i++)
+ while (!bits.at(i).empty() && (1 << i) <= free_bit_slots) {
+ auto it = bits.at(i).begin();
+ RTLIL::SigBit bit = *it;
+ bits.at(i).erase(it);
+ for (int k = 0; k < (1 << i); k++, free_bit_slots--)
+ tree_sum_bits.push_back(bit);
+ unique_tree_bits++;
+ }
+ }
+
+ if (!tree_sum_bits.empty())
+ log(" packed %d (%d) bits into adder tree\n", SIZE(tree_sum_bits), unique_tree_bits);
+
+ if (SIZE(summands) == 0)
+ return RTLIL::SigSpec(0, width);
+
+ if (SIZE(summands) == 1)
+ return summands.front();
+
+ while (SIZE(summands) > 2)
+ {
+ std::vector<RTLIL::SigSpec> new_summands;
+ for (int i = 0; i < SIZE(summands); i += 3)
+ if (i+2 < SIZE(summands)) {
+ RTLIL::SigSpec in1 = summands[i];
+ RTLIL::SigSpec in2 = summands[i+1];
+ RTLIL::SigSpec in3 = summands[i+2];
+ RTLIL::SigSpec out1, out2;
+ fulladd(in1, in2, in3, out1, out2);
+ RTLIL::SigBit extra_bit = RTLIL::S0;
+ if (!tree_sum_bits.empty()) {
+ extra_bit = tree_sum_bits.back();
+ tree_sum_bits.pop_back();
+ }
+ new_summands.push_back(out1);
+ new_summands.push_back({out2.extract(0, width-1), extra_bit});
+ } else {
+ new_summands.push_back(summands[i]);
+ i -= 2;
+ }
+ summands.swap(new_summands);
+ }
+
+ return module->Add(NEW_ID, summands.front(), summands.back());
+ }
+};
+
+void maccmap(RTLIL::Module *module, RTLIL::Cell *cell, bool unmap)
+{
+ int width = SIZE(cell->getPort("\\Y"));
+
+ Macc macc;
+ macc.from_cell(cell);
+
+ RTLIL::SigSpec all_input_bits;
+ all_input_bits.append(cell->getPort("\\A"));
+ all_input_bits.append(cell->getPort("\\B"));
+
+ if (all_input_bits.to_sigbit_set().count(RTLIL::Sx)) {
+ module->connect(cell->getPort("\\Y"), RTLIL::SigSpec(RTLIL::Sx, width));
+ return;
+ }
+
+ for (auto &port : macc.ports)
+ if (SIZE(port.in_b) == 0)
+ log(" %s %s (%d bits, %s)\n", port.do_subtract ? "sub" : "add", log_signal(port.in_a),
+ SIZE(port.in_a), port.is_signed ? "signed" : "unsigned");
+ else
+ log(" %s %s * %s (%dx%d bits, %s)\n", port.do_subtract ? "sub" : "add", log_signal(port.in_a), log_signal(port.in_b),
+ SIZE(port.in_a), SIZE(port.in_b), port.is_signed ? "signed" : "unsigned");
+
+ if (SIZE(macc.bit_ports) != 0)
+ log(" add bits %s (%d bits)\n", log_signal(macc.bit_ports), SIZE(macc.bit_ports));
+
+ if (unmap)
+ {
+ typedef std::pair<RTLIL::SigSpec, bool> summand_t;
+ std::vector<summand_t> summands;
+
+ for (auto &port : macc.ports) {
+ summand_t this_summand;
+ if (SIZE(port.in_b)) {
+ this_summand.first = module->addWire(NEW_ID, width);
+ module->addMul(NEW_ID, port.in_a, port.in_b, this_summand.first, port.is_signed);
+ } else if (SIZE(port.in_a) != width) {
+ this_summand.first = module->addWire(NEW_ID, width);
+ module->addPos(NEW_ID, port.in_a, this_summand.first, port.is_signed);
+ } else {
+ this_summand.first = port.in_a;
+ }
+ this_summand.second = port.do_subtract;
+ summands.push_back(this_summand);
+ }
+
+ for (auto &bit : macc.bit_ports)
+ summands.push_back(summand_t(bit, false));
+
+ if (SIZE(summands) == 0)
+ summands.push_back(summand_t(RTLIL::SigSpec(0, width), false));
+
+ while (SIZE(summands) > 1)
+ {
+ std::vector<summand_t> new_summands;
+ for (int i = 0; i < SIZE(summands); i += 2) {
+ if (i+1 < SIZE(summands)) {
+ summand_t this_summand;
+ this_summand.first = module->addWire(NEW_ID, width);
+ this_summand.second = summands[i].second && summands[i+1].second;
+ if (summands[i].second == summands[i+1].second)
+ module->addAdd(NEW_ID, summands[i].first, summands[i+1].first, this_summand.first);
+ else if (summands[i].second)
+ module->addSub(NEW_ID, summands[i+1].first, summands[i].first, this_summand.first);
+ else if (summands[i+1].second)
+ module->addSub(NEW_ID, summands[i].first, summands[i+1].first, this_summand.first);
+ else
+ log_abort();
+ new_summands.push_back(this_summand);
+ } else
+ new_summands.push_back(summands[i]);
+ }
+ summands.swap(new_summands);
+ }
+
+ if (summands.front().second)
+ module->addNeg(NEW_ID, summands.front().first, cell->getPort("\\Y"));
+ else
+ module->connect(cell->getPort("\\Y"), summands.front().first);
+ }
+ else
+ {
+ MaccmapWorker worker(module, width);
+
+ for (auto &port : macc.ports)
+ if (SIZE(port.in_b) == 0)
+ worker.add(port.in_a, port.is_signed, port.do_subtract);
+ else
+ worker.add(port.in_a, port.in_b, port.is_signed, port.do_subtract);
+
+ for (auto &bit : macc.bit_ports)
+ worker.add(bit, 0);
+
+ module->connect(cell->getPort("\\Y"), worker.synth());
+ }
+}
+
+struct MaccmapPass : public Pass {
+ MaccmapPass() : Pass("maccmap", "mapping macc cells") { }
+ virtual void help()
+ {
+ // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
+ log("\n");
+ log(" maccmap [-unmap] [selection]\n");
+ log("\n");
+ log("This pass maps $macc cells to yosys gate primitives. When the -unmap option is\n");
+ log("used then the $macc cell is mapped to $and, $sub, etc. cells instead.\n");
+ log("\n");
+ }
+ virtual void execute(std::vector<std::string> args, RTLIL::Design *design)
+ {
+ bool unmap_mode = false;
+
+ log_header("Executing MACCMAP pass (map $macc cells).\n");
+
+ size_t argidx;
+ for (argidx = 1; argidx < args.size(); argidx++) {
+ if (args[argidx] == "-unmap") {
+ unmap_mode = true;
+ continue;
+ }
+ break;
+ }
+ extra_args(args, argidx, design);
+
+ for (auto mod : design->selected_modules())
+ for (auto cell : mod->selected_cells())
+ if (cell->type == "$macc") {
+ log("Mapping %s.%s (%s).\n", log_id(mod), log_id(cell), log_id(cell->type));
+ maccmap(mod, cell, unmap_mode);
+ mod->remove(cell);
+ }
+ }
+} MaccmapPass;
+