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backends/rtlil: Do not shorten a value with z bits to 'x

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This commit is contained in:
Jannis Harder 2023-01-29 13:54:02 +01:00
parent 541fdffff2
commit b08a880704
4 changed files with 22 additions and 1 deletions
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11
kernel/rtlil.cc
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@ -370,6 +370,17 @@ bool RTLIL::Const::is_fully_undef() const
return true;
}
bool RTLIL::Const::is_fully_undef_x_only() const
{
cover("kernel.rtlil.const.is_fully_undef_x_only");
for (const auto &bit : bits)
if (bit != RTLIL::State::Sx)
return false;
return true;
}
bool RTLIL::Const::is_onehot(int *pos) const
{
cover("kernel.rtlil.const.is_onehot");

1
kernel/rtlil.h
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@ -686,6 +686,7 @@ struct RTLIL::Const
bool is_fully_ones() const;
bool is_fully_def() const;
bool is_fully_undef() const;
bool is_fully_undef_x_only() const;
bool is_onehot(int *pos = nullptr) const;
inline RTLIL::Const extract(int offset, int len = 1, RTLIL::State padding = RTLIL::State::S0) const {