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Make Const::is_*() functions work on packed bits without decaying to vector<State>

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This commit is contained in:
Robert O'Callahan 2025-08-29 04:50:35 +00:00
parent 9c96e61e9b
commit a515055be4
2 changed files with 120 additions and 15 deletions
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44
kernel/rtlil.cc
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@ -632,10 +632,17 @@ RTLIL::State RTLIL::Const::const_iterator::operator*() const {
bool RTLIL::Const::is_fully_zero() const
{
bitvectorize_internal();
bitvectype& bv = get_bits();
cover("kernel.rtlil.const.is_fully_zero");
if (auto str = get_if_str()) {
for (char ch : *str)
if (ch != 0)
return false;
return true;
}
bitvectype& bv = get_bits();
for (const auto &bit : bv)
if (bit != RTLIL::State::S0)
return false;
@ -645,10 +652,16 @@ bool RTLIL::Const::is_fully_zero() const
bool RTLIL::Const::is_fully_ones() const
{
bitvectorize_internal();
bitvectype& bv = get_bits();
cover("kernel.rtlil.const.is_fully_ones");
if (auto str = get_if_str()) {
for (char ch : *str)
if (ch != (char)0xff)
return false;
return true;
}
bitvectype& bv = get_bits();
for (const auto &bit : bv)
if (bit != RTLIL::State::S1)
return false;
@ -660,9 +673,10 @@ bool RTLIL::Const::is_fully_def() const
{
cover("kernel.rtlil.const.is_fully_def");
bitvectorize_internal();
bitvectype& bv = get_bits();
if (is_str())
return true;
bitvectype& bv = get_bits();
for (const auto &bit : bv)
if (bit != RTLIL::State::S0 && bit != RTLIL::State::S1)
return false;
@ -674,9 +688,10 @@ bool RTLIL::Const::is_fully_undef() const
{
cover("kernel.rtlil.const.is_fully_undef");
bitvectorize_internal();
bitvectype& bv = get_bits();
if (auto str = get_if_str())
return str->empty();
bitvectype& bv = get_bits();
for (const auto &bit : bv)
if (bit != RTLIL::State::Sx && bit != RTLIL::State::Sz)
return false;
@ -688,9 +703,10 @@ bool RTLIL::Const::is_fully_undef_x_only() const
{
cover("kernel.rtlil.const.is_fully_undef_x_only");
bitvectorize_internal();
bitvectype& bv = get_bits();
if (auto str = get_if_str())
return str->empty();
bitvectype& bv = get_bits();
for (const auto &bit : bv)
if (bit != RTLIL::State::Sx)
return false;
@ -702,12 +718,10 @@ bool RTLIL::Const::is_onehot(int *pos) const
{
cover("kernel.rtlil.const.is_onehot");
bitvectorize_internal();
bitvectype& bv = get_bits();
bool found = false;
for (int i = 0; i < GetSize(*this); i++) {
auto &bit = bv[i];
int size = GetSize(*this);
for (int i = 0; i < size; i++) {
State bit = (*this)[i];
if (bit != RTLIL::State::S0 && bit != RTLIL::State::S1)
return false;
if (bit == RTLIL::State::S1) {