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Make Const::Const(long long) constructor use packed bits internally if possible

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This commit is contained in:
Robert O'Callahan 2025-08-29 03:08:31 +00:00
parent 31fc0f53e5
commit e206b059f6
3 changed files with 52 additions and 1 deletions
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25
kernel/rtlil.cc
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@ -221,9 +221,34 @@ RTLIL::Const::Const(const std::string &str)
tag = backing_tag::string;
}
RTLIL::Const::Const(long long val) // default width 32
{
flags = RTLIL::CONST_FLAG_NONE;
char bytes[] = {
(char)(val >> 24), (char)(val >> 16), (char)(val >> 8), (char)val
};
new ((void*)&str_) std::string(bytes, 4);
tag = backing_tag::string;
}
RTLIL::Const::Const(long long val, int width)
{
flags = RTLIL::CONST_FLAG_NONE;
if ((width & 7) == 0) {
new ((void*)&str_) std::string();
tag = backing_tag::string;
std::string& str = get_str();
int bytes = width >> 3;
signed char sign_byte = val < 0 ? -1 : 0;
str.resize(bytes, sign_byte);
bytes = std::min<int>(bytes, sizeof(val));
for (int i = 0; i < bytes; i++) {
str[str.size() - 1 - i] = val;
val = val >> 8;
}
return;
}
new ((void*)&bits_) bitvectype();
tag = backing_tag::bits;
bitvectype& bv = get_bits();