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/*
* yosys -- Yosys Open SYnthesis Suite
*
* Copyright (C) 2014 Clifford Wolf <clifford@clifford.at>
* Copyright (C) 2014 Johann Glaser <Johann.Glaser@gmx.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/satgen.h"
USING_YOSYS_NAMESPACE
PRIVATE_NAMESPACE_BEGIN
static uint32_t xorshift32_state = 123456789;
static uint32_t xorshift32(uint32_t limit) {
xorshift32_state ^= xorshift32_state << 13;
xorshift32_state ^= xorshift32_state >> 17;
xorshift32_state ^= xorshift32_state << 5;
return xorshift32_state % limit;
}
static RTLIL::Wire *getw(std::vector<RTLIL::Wire*> &wires, RTLIL::Wire *w)
{
while (1) {
int idx = xorshift32(GetSize(wires));
if (wires[idx] != w && !wires[idx]->port_output)
return wires[idx];
}
}
static void test_abcloop()
{
log("Rng seed value: %u\n", int(xorshift32_state));
RTLIL::Design *design = new RTLIL::Design;
RTLIL::Module *module = nullptr;
RTLIL::SigSpec in_sig, out_sig;
bool truthtab[16][4];
int create_cycles = 0;
while (1)
{
module = design->addModule("\\uut");
create_cycles++;
in_sig = {};
out_sig = {};
std::vector<RTLIL::Wire*> wires;
for (int i = 0; i < 4; i++) {
RTLIL::Wire *w = module->addWire(stringf("\\i%d", i));
w->port_input = true;
wires.push_back(w);
in_sig.append(w);
}
for (int i = 0; i < 4; i++) {
RTLIL::Wire *w = module->addWire(stringf("\\o%d", i));
w->port_output = true;
wires.push_back(w);
out_sig.append(w);
}
for (int i = 0; i < 16; i++) {
RTLIL::Wire *w = module->addWire(stringf("\\t%d", i));
wires.push_back(w);
}
for (auto w : wires)
if (!w->port_input)
switch (xorshift32(12))
{
case 0:
module->addNotGate(w->name.str() + "g", getw(wires, w), w);
break;
case 1:
module->addAndGate(w->name.str() + "g", getw(wires, w), getw(wires, w), w);
break;
case 2:
module->addNandGate(w->name.str() + "g", getw(wires, w), getw(wires, w), w);
break;
case 3:
module->addOrGate(w->name.str() + "g", getw(wires, w), getw(wires, w), w);
break;
case 4:
module->addNorGate(w->name.str() + "g", getw(wires, w), getw(wires, w), w);
break;
case 5:
module->addXorGate(w->name.str() + "g", getw(wires, w), getw(wires, w), w);
break;
case 6:
module->addXnorGate(w->name.str() + "g", getw(wires, w), getw(wires, w), w);
break;
case 7:
module->addMuxGate(w->name.str() + "g", getw(wires, w), getw(wires, w), getw(wires, w), w);
break;
case 8:
module->addAoi3Gate(w->name.str() + "g", getw(wires, w), getw(wires, w), getw(wires, w), w);
break;
case 9:
module->addOai3Gate(w->name.str() + "g", getw(wires, w), getw(wires, w), getw(wires, w), w);
break;
case 10:
module->addAoi4Gate(w->name.str() + "g", getw(wires, w), getw(wires, w), getw(wires, w), getw(wires, w), w);
break;
case 11:
module->addOai4Gate(w->name.str() + "g", getw(wires, w), getw(wires, w), getw(wires, w), getw(wires, w), w);
break;
}
module->fixup_ports();
Pass::call(design, "clean");
ezDefaultSAT ez;
SigMap sigmap(module);
SatGen satgen(&ez, &sigmap);
for (auto c : module->cells()) {
bool ok = satgen.importCell(c);
log_assert(ok);
}
std::vector<int> in_vec = satgen.importSigSpec(in_sig);
std::vector<int> inverse_in_vec = ez.vec_not(in_vec);
std::vector<int> out_vec = satgen.importSigSpec(out_sig);
for (int i = 0; i < 16; i++)
{
std::vector<int> assumptions;
for (int j = 0; j < GetSize(in_vec); j++)
assumptions.push_back((i & (1 << j)) ? in_vec.at(j) : inverse_in_vec.at(j));
std::vector<bool> results;
if (!ez.solve(out_vec, results, assumptions)) {
log("No stable solution for input %d found -> recreate module.\n", i);
goto recreate_module;
}
for (int j = 0; j < 4; j++)
truthtab[i][j] = results[j];
assumptions.push_back(ez.vec_ne(out_vec, ez.vec_const(results)));
std::vector<bool> results2;
if (ez.solve(out_vec, results2, assumptions)) {
log("Two stable solutions for input %d found -> recreate module.\n", i);
goto recreate_module;
}
}
break;
recreate_module:
design->remove(module);
}
log("Found viable UUT after %d cycles:\n", create_cycles);
Pass::call(design, "write_ilang");
Pass::call(design, "abc");
log("\n");
log("Pre- and post-abc truth table:\n");
ezDefaultSAT ez;
SigMap sigmap(module);
SatGen satgen(&ez, &sigmap);
for (auto c : module->cells()) {
bool ok = satgen.importCell(c);
log_assert(ok);
}
std::vector<int> in_vec = satgen.importSigSpec(in_sig);
std::vector<int> inverse_in_vec = ez.vec_not(in_vec);
std::vector<int> out_vec = satgen.importSigSpec(out_sig);
bool found_error = false;
bool truthtab2[16][4];
for (int i = 0; i < 16; i++)
{
std::vector<int> assumptions;
for (int j = 0; j < GetSize(in_vec); j++)
assumptions.push_back((i & (1 << j)) ? in_vec.at(j) : inverse_in_vec.at(j));
for (int j = 0; j < 4; j++)
truthtab2[i][j] = truthtab[i][j];
std::vector<bool> results;
if (!ez.solve(out_vec, results, assumptions)) {
log("No stable solution for input %d found.\n", i);
found_error = true;
continue;
}
for (int j = 0; j < 4; j++)
truthtab2[i][j] = results[j];
assumptions.push_back(ez.vec_ne(out_vec, ez.vec_const(results)));
std::vector<bool> results2;
if (ez.solve(out_vec, results2, assumptions)) {
log("Two stable solutions for input %d found -> recreate module.\n", i);
found_error = true;
}
}
for (int i = 0; i < 16; i++) {
log("%3d ", i);
for (int j = 0; j < 4; j++)
log("%c", truthtab[i][j] ? '1' : '0');
log(" ");
for (int j = 0; j < 4; j++)
log("%c", truthtab2[i][j] ? '1' : '0');
for (int j = 0; j < 4; j++)
if (truthtab[i][j] != truthtab2[i][j]) {
found_error = true;
log(" !");
break;
}
log("\n");
}
log_assert(found_error == false);
log("\n");
}
struct TestAbcloopPass : public Pass {
TestAbcloopPass() : Pass("test_abcloop", "automatically test handling of loops in abc command") { }
virtual void help()
{
// |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
log("\n");
log(" test_abcloop [options]\n");
log("\n");
log("Test handling of logic loops in ABC.\n");
log("\n");
log(" -n {integer}\n");
log(" create this number of circuits and test them (default = 100).\n");
log("\n");
log(" -s {positive_integer}\n");
log(" use this value as rng seed value (default = unix time).\n");
log("\n");
}
virtual void execute(std::vector<std::string> args, RTLIL::Design*)
{
int num_iter = 100;
xorshift32_state = 0;
int argidx;
for (argidx = 1; argidx < GetSize(args); argidx++)
{
if (args[argidx] == "-n" && argidx+1 < GetSize(args)) {
num_iter = atoi(args[++argidx].c_str());
continue;
}
if (args[argidx] == "-s" && argidx+1 < GetSize(args)) {
xorshift32_state = atoi(args[++argidx].c_str());
continue;
}
break;
}
if (xorshift32_state == 0)
xorshift32_state = time(NULL) & 0x7fffffff;
for (int i = 0; i < num_iter; i++)
test_abcloop();
}
} TestAbcloopPass;
PRIVATE_NAMESPACE_END
|
