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Speed up RTLIL::Const::decode_string by 1.7x.

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This commit is contained in:
Rasmus Munk Larsen 2023-09-27 17:16:13 -07:00
parent b35ea8f896
commit 01a015747e
1 changed files with 24 additions and 9 deletions
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31
kernel/rtlil.cc
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@ -313,18 +313,33 @@ RTLIL::Const RTLIL::Const::from_string(const std::string &str)
std::string RTLIL::Const::decode_string() const std::string RTLIL::Const::decode_string() const
{ {
std::string string; const int n = GetSize(bits);
string.reserve(GetSize(bits)/8); const int n_over_8 = n / 8;
for (int i = 0; i < GetSize(bits); i += 8) { std::string s;
s.reserve(n_over_8);
int i = n_over_8 * 8;
if (i < n) {
char ch = 0; char ch = 0;
for (int j = 0; j < 8 && i + j < int (bits.size()); j++) for (int j = 0; j < (n - i); j++) {
if (bits[i + j] == RTLIL::State::S1) if (bits[j + i] == RTLIL::State::S1) {
ch |= 1 << j; ch |= 1 << j;
}
}
if (ch != 0) if (ch != 0)
string.append({ch}); s.append({ch});
} }
std::reverse(string.begin(), string.end()); i -= 8;
return string; for (; i >= 0; i -= 8) {
char ch = 0;
for (int j = 0; j < 8; j++) {
if (bits[j + i] == RTLIL::State::S1) {
ch |= 1 << j;
}
}
if (ch != 0)
s.append({ch});
}
return s;
} }
bool RTLIL::Const::is_fully_zero() const bool RTLIL::Const::is_fully_zero() const