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Handle sliced bits as clock inputs (fixes #2542)

This commit is contained in:
Iris Johnson 2021-01-14 16:26:20 -06:00
parent 01626e6746
commit 86607d0fdc
1 changed files with 11 additions and 3 deletions
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14
backends/cxxrtl/cxxrtl_backend.cc
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@ -601,6 +601,13 @@ struct WireType {
bool is_exact() const { return type == ALIAS || type == CONST; }
};
// Tests for a SigSpec that is backed by a specific slice of a wire, this is used
// instead of .is_wire() on clocks because they can be only a portion of an underlying
// wire
bool is_wire_slice(const RTLIL::SigSpec& sig) {
return sig.is_chunk() && sig.chunks()[0].wire;
}
struct CxxrtlWorker {
bool split_intf = false;
std::string intf_filename;
@ -1110,7 +1117,8 @@ 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_wire_slice(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);
@ -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($memwr) && cell->getParam(ID::CLK_ENABLE).as_bool() && is_wire_slice(cell->getPort(ID::CLK))) {
RTLIL::SigBit clk_bit = sigmap(cell->getPort(ID::CLK))[0];
const RTLIL::Memory *memory = module->memories[cell->getParam(ID::MEMID).decode_string()];
memwr_per_domain[{clk_bit, memory}].insert(cell);
@ -2384,7 +2392,7 @@ struct CxxrtlWorker {
}
for (auto cell : module->cells()) {
// Collect groups of memory write ports read by every transparent read port.
if (cell->type == ID($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_wire_slice(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()];