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xilinx_dsp: signorm compatibility

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This commit is contained in:
Emil J. Tywoniak 2026-04-15 11:37:16 +02:00
parent 26a1839fb7
commit 5bff8b4068
2 changed files with 54 additions and 7 deletions
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49
techlibs/xilinx/xilinx_dsp.cc
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@ -64,18 +64,61 @@ static Cell* addDsp(Module *module) {
return cell;
}
SigPool simd_signals(Module *module, SigMap* sigmap)
{
SigPool simd_signals;
// Mark representatives of wires that have the attribute
for (auto wire : module->wires()) {
SigSpec reps = (*sigmap)(wire);
log_assert(reps.size() == wire->width);
for (int i = 0; i < reps.size(); i++) {
auto bit = reps[i];
auto src_bit = SigBit(wire, i);
if (src_bit.is_wire() && src_bit.wire->has_attribute(ID::use_dsp)) {
if (src_bit.wire->get_strpool_attribute(ID::use_dsp).count("simd")) {
simd_signals.add(bit);
}
}
}
}
// Also mark all aliases of those representatives
for (auto wire : module->wires()) {
SigSpec reps = (*sigmap)(wire);
log_assert(reps.size() == wire->width);
for (int i = 0; i < reps.size(); i++) {
auto bit = reps[i];
auto src_bit = SigBit(wire, i);
if (simd_signals.check(bit)) {
simd_signals.add(src_bit);
}
}
}
// This seems silly, but that's generalized RTLIL for you!
return simd_signals;
}
bool is_allowed(SigSpec& sig, SigPool& allowed_bits)
{
for (auto bit : sig.bits()) {
if (!allowed_bits.check(bit)) {
return false;
}
}
return true;
}
void xilinx_simd_pack(Module *module, SigMap* sigmap, const std::vector<Cell*> &selected_cells)
{
std::deque<Cell*> simd12_add, simd12_sub;
std::deque<Cell*> simd24_add, simd24_sub;
SigPool simds = simd_signals(module, sigmap);
for (auto cell : selected_cells) {
if (!cell->type.in(ID($add), ID($sub)))
continue;
SigSpec Y = cell->getPort(ID::Y);
if (!Y.is_chunk())
continue;
if (!Y.as_chunk().wire->get_strpool_attribute(ID(use_dsp)).count("simd"))
if (!is_allowed(Y, simds))
continue;
if (GetSize(Y) > 25)
continue;