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celltypes: Comment pointing to ConstEval

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`CellTypes::eval()` is more generic but also more limited.  `ConstEval::eval()` requires more setup (both in code and at runtime) but has more complete support.
This commit is contained in:
Krystine Sherwin 2025-04-22 10:05:30 +12:00
parent 78a6235200
commit 66f66d51ee
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kernel/celltypes.h
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@ -334,6 +334,7 @@ struct CellTypes
return v; return v;
} }
// Consider using the ConstEval struct instead if you need named ports and/or multiple outputs
static RTLIL::Const eval(RTLIL::IdString type, const RTLIL::Const &arg1, const RTLIL::Const &arg2, bool signed1, bool signed2, int result_len, bool *errp = nullptr) static RTLIL::Const eval(RTLIL::IdString type, const RTLIL::Const &arg1, const RTLIL::Const &arg2, bool signed1, bool signed2, int result_len, bool *errp = nullptr)
{ {
if (type == ID($sshr) && !signed1) if (type == ID($sshr) && !signed1)
@ -416,6 +417,7 @@ struct CellTypes
log_abort(); log_abort();
} }
// Consider using the ConstEval struct instead if you need named ports and/or multiple outputs
static RTLIL::Const eval(RTLIL::Cell *cell, const RTLIL::Const &arg1, const RTLIL::Const &arg2, bool *errp = nullptr) static RTLIL::Const eval(RTLIL::Cell *cell, const RTLIL::Const &arg1, const RTLIL::Const &arg2, bool *errp = nullptr)
{ {
if (cell->type == ID($slice)) { if (cell->type == ID($slice)) {
@ -503,6 +505,7 @@ struct CellTypes
return eval(cell->type, arg1, arg2, signed_a, signed_b, result_len, errp); return eval(cell->type, arg1, arg2, signed_a, signed_b, result_len, errp);
} }
// Consider using the ConstEval struct instead if you need named ports and/or multiple outputs
static RTLIL::Const eval(RTLIL::Cell *cell, const RTLIL::Const &arg1, const RTLIL::Const &arg2, const RTLIL::Const &arg3, bool *errp = nullptr) static RTLIL::Const eval(RTLIL::Cell *cell, const RTLIL::Const &arg1, const RTLIL::Const &arg2, const RTLIL::Const &arg3, bool *errp = nullptr)
{ {
if (cell->type.in(ID($mux), ID($_MUX_))) if (cell->type.in(ID($mux), ID($_MUX_)))
@ -522,6 +525,7 @@ struct CellTypes
return eval(cell, arg1, arg2, errp); return eval(cell, arg1, arg2, errp);
} }
// Consider using the ConstEval struct instead if you need named ports and/or multiple outputs
static RTLIL::Const eval(RTLIL::Cell *cell, const RTLIL::Const &arg1, const RTLIL::Const &arg2, const RTLIL::Const &arg3, const RTLIL::Const &arg4, bool *errp = nullptr) static RTLIL::Const eval(RTLIL::Cell *cell, const RTLIL::Const &arg1, const RTLIL::Const &arg2, const RTLIL::Const &arg3, const RTLIL::Const &arg4, bool *errp = nullptr)
{ {
if (cell->type == ID($_AOI4_)) if (cell->type == ID($_AOI4_))