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Add try_as_const and use the const iterator a bit more

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This commit is contained in:
Robert O'Callahan 2025-10-28 15:48:24 +00:00
parent 04a6dbc562
commit 000c081965
2 changed files with 29 additions and 11 deletions
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37
kernel/rtlil.cc
View file

@ -5621,33 +5621,48 @@ std::string RTLIL::SigSpec::as_string() const
return str;
}
std::optional<RTLIL::Const> RTLIL::SigSpec::try_as_const() const
{
cover("kernel.rtlil.sigspec.as_const");
auto it = chunks().begin();
if (it == chunks().end())
return RTLIL::Const();
SigChunk chunk = *it;
if (chunk.wire != NULL || ++it != chunks().end())
return std::nullopt;
return RTLIL::Const(std::move(chunk.data));
}
RTLIL::Const RTLIL::SigSpec::as_const() const
{
cover("kernel.rtlil.sigspec.as_const");
pack();
log_assert(is_fully_const() && GetSize(chunks_) <= 1);
if (width_)
return chunks_[0].data;
return RTLIL::Const();
std::optional<RTLIL::Const> c = try_as_const();
log_assert(c.has_value());
return *c;
}
RTLIL::Wire *RTLIL::SigSpec::as_wire() const
{
cover("kernel.rtlil.sigspec.as_wire");
pack();
log_assert(is_wire());
return chunks_[0].wire;
auto it = chunks().begin();
log_assert(it != chunks().end());
RTLIL::SigChunk chunk = *it;
log_assert(++it == chunks().end() && chunk.wire && chunk.wire->width == width_);
return chunk.wire;
}
RTLIL::SigChunk RTLIL::SigSpec::as_chunk() const
{
cover("kernel.rtlil.sigspec.as_chunk");
pack();
log_assert(is_chunk());
return chunks_[0];
auto it = chunks().begin();
log_assert(it != chunks().end());
RTLIL::SigChunk chunk = *it;
log_assert(++it == chunks().end());
return chunk;
}
RTLIL::SigBit RTLIL::SigSpec::as_bit() const

3
kernel/rtlil.h
View file

@ -1453,6 +1453,9 @@ public:
int as_int_saturating(bool is_signed = false) const;
std::string as_string() const;
// Returns std::nullopt if there are any non-constant bits. Returns an empty
// Const if this has zero width.
std::optional<RTLIL::Const> try_as_const() const;
RTLIL::Const as_const() const;
RTLIL::Wire *as_wire() const;
RTLIL::SigChunk as_chunk() const;