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Merge pull request #2544 from modwizcode/fix-clock 

CXXRTL: Fix sliced bits as clock inputs
This commit is contained in:
whitequark 2021-01-26 21:18:06 +00:00 committed by GitHub
parent 8eaeaa8434 c8415884d1
commit d73ffa07f2
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 15 additions and 7 deletions
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22
backends/cxxrtl/cxxrtl_backend.cc
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@ -601,6 +601,12 @@ struct WireType {
bool is_exact() const { return type == ALIAS || type == CONST; }
};
// Tests for a SigSpec that is a valid clock input, clocks have to have a backing wire and be a single bit
// using this instead of sig.is_wire() solves issues when the clock is a slice instead of a full wire
bool is_valid_clock(const RTLIL::SigSpec& sig) {
return sig.is_chunk() && sig.is_bit() && sig[0].wire;
}
struct CxxrtlWorker {
bool split_intf = false;
std::string intf_filename;
@ -1110,7 +1116,8 @@ struct CxxrtlWorker {
// Flip-flops
} else if (is_ff_cell(cell->type)) {
log_assert(!for_debug);
if (cell->hasPort(ID::CLK) && cell->getPort(ID::CLK).is_wire()) {
// Clocks might be slices of larger signals but should only ever be single bit
if (cell->hasPort(ID::CLK) && is_valid_clock(cell->getPort(ID::CLK))) {
// Edge-sensitive logic
RTLIL::SigBit clk_bit = cell->getPort(ID::CLK)[0];
clk_bit = sigmaps[clk_bit.wire->module](clk_bit);
@ -2266,7 +2273,7 @@ struct CxxrtlWorker {
void register_edge_signal(SigMap &sigmap, RTLIL::SigSpec signal, RTLIL::SyncType type)
{
signal = sigmap(signal);
log_assert(signal.is_wire() && signal.is_bit());
log_assert(is_valid_clock(signal));
log_assert(type == RTLIL::STp || type == RTLIL::STn || type == RTLIL::STe);
RTLIL::SigBit sigbit = signal[0];
@ -2274,7 +2281,8 @@ struct CxxrtlWorker {
edge_types[sigbit] = type;
else if (edge_types[sigbit] != type)
edge_types[sigbit] = RTLIL::STe;
edge_wires.insert(signal.as_wire());
// Cannot use as_wire because signal might not be a full wire, instead extract the wire from the sigbit
edge_wires.insert(sigbit.wire);
}
void analyze_design(RTLIL::Design *design)
@ -2355,14 +2363,14 @@ struct CxxrtlWorker {
// Various DFF cells are treated like posedge/negedge processes, see above for details.
if (cell->type.in(ID($dff), ID($dffe), ID($adff), ID($adffe), ID($dffsr), ID($dffsre), ID($sdff), ID($sdffe), ID($sdffce))) {
if (sigmap(cell->getPort(ID::CLK)).is_wire())
if (is_valid_clock(cell->getPort(ID::CLK)))
register_edge_signal(sigmap, cell->getPort(ID::CLK),
cell->parameters[ID::CLK_POLARITY].as_bool() ? RTLIL::STp : RTLIL::STn);
}
// Similar for memory port cells.
if (cell->type.in(ID($memrd), ID($memwr))) {
if (cell->getParam(ID::CLK_ENABLE).as_bool()) {
if (sigmap(cell->getPort(ID::CLK)).is_wire())
if (is_valid_clock(cell->getPort(ID::CLK)))
register_edge_signal(sigmap, cell->getPort(ID::CLK),
cell->parameters[ID::CLK_POLARITY].as_bool() ? RTLIL::STp : RTLIL::STn);
}
@ -2372,7 +2380,7 @@ struct CxxrtlWorker {
if (cell->type == ID($memwr))
writable_memories.insert(module->memories[cell->getParam(ID::MEMID).decode_string()]);
// Collect groups of memory write ports in the same domain.
if (cell->type == ID($memwr) && cell->getParam(ID::CLK_ENABLE).as_bool() && cell->getPort(ID::CLK).is_wire()) {
if (cell->type == ID($memwr) && cell->getParam(ID::CLK_ENABLE).as_bool() && is_valid_clock(cell->getPort(ID::CLK))) {
RTLIL::SigBit clk_bit = sigmap(cell->getPort(ID::CLK))[0];
const RTLIL::Memory *memory = module->memories[cell->getParam(ID::MEMID).decode_string()];
memwr_per_domain[{clk_bit, memory}].insert(cell);
@ -2384,7 +2392,7 @@ struct CxxrtlWorker {
}
for (auto cell : module->cells()) {
// Collect groups of memory write ports read by every transparent read port.
if (cell->type == ID($memrd) && cell->getParam(ID::CLK_ENABLE).as_bool() && cell->getPort(ID::CLK).is_wire() &&
if (cell->type == ID($memrd) && cell->getParam(ID::CLK_ENABLE).as_bool() && is_valid_clock(cell->getPort(ID::CLK)) &&
cell->getParam(ID::TRANSPARENT).as_bool()) {
RTLIL::SigBit clk_bit = sigmap(cell->getPort(ID::CLK))[0];
const RTLIL::Memory *memory = module->memories[cell->getParam(ID::MEMID).decode_string()];