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cxxrtl: Add internal cell "bwmux"

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Mirrors the implementation for the smt2 backend

Co-authored-by: Martin Povišer <povik@cutebit.org>
This commit is contained in:
David Sawatzke 2025-04-16 13:26:50 +02:00 • committed by Catherine
parent c894685f26
commit 04098933c7
2 changed files with 14 additions and 1 deletions
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10
backends/cxxrtl/cxxrtl_backend.cc
View file

@ -200,7 +200,7 @@ bool is_extending_cell(RTLIL::IdString type)
bool is_inlinable_cell(RTLIL::IdString type) bool is_inlinable_cell(RTLIL::IdString type)
{ {
return is_unary_cell(type) || is_binary_cell(type) || type.in( return is_unary_cell(type) || is_binary_cell(type) || type.in(
ID($mux), ID($concat), ID($slice), ID($pmux), ID($bmux), ID($demux)); ID($mux), ID($concat), ID($slice), ID($pmux), ID($bmux), ID($demux), ID($bwmux));
} }
bool is_ff_cell(RTLIL::IdString type) bool is_ff_cell(RTLIL::IdString type)
@ -1198,6 +1198,14 @@ struct CxxrtlWorker {
f << ">("; f << ">(";
dump_sigspec_rhs(cell->getPort(ID::S), for_debug); dump_sigspec_rhs(cell->getPort(ID::S), for_debug);
f << ").val()"; f << ").val()";
// Bitwise muxes
} else if (cell->type == ID($bwmux)) {
dump_sigspec_rhs(cell->getPort(ID::A), for_debug);
f << ".bwmux(";
dump_sigspec_rhs(cell->getPort(ID::B), for_debug);
f << ",";
dump_sigspec_rhs(cell->getPort(ID::S), for_debug);
f << ").val()";
// Demuxes // Demuxes
} else if (cell->type == ID($demux)) { } else if (cell->type == ID($demux)) {
dump_sigspec_rhs(cell->getPort(ID::A), for_debug); dump_sigspec_rhs(cell->getPort(ID::A), for_debug);

5
backends/cxxrtl/runtime/cxxrtl/cxxrtl.h
View file

@ -498,6 +498,11 @@ struct value : public expr_base<value<Bits>> {
return result; return result;
} }
CXXRTL_ALWAYS_INLINE
value<Bits> bwmux(const value<Bits> &b, const value<Bits> &s) const {
return (bit_and(s.bit_not())).bit_or(b.bit_and(s));
}
template<size_t ResultBits, size_t SelBits> template<size_t ResultBits, size_t SelBits>
value<ResultBits> demux(const value<SelBits> &sel) const { value<ResultBits> demux(const value<SelBits> &sel) const {
static_assert(Bits << SelBits == ResultBits, "invalid sizes used in demux()"); static_assert(Bits << SelBits == ResultBits, "invalid sizes used in demux()");