75cffdf92c
std::stringstream has a measurable overhead for preprocessing - it appears that operator<< does a tiny bit of extra work for appending chars/strings and also can't be inlined in most cases on VS2015; additionally, std::endl triggers a stream flush which also adds up. Replacing this with std::string buffer gets the preprocessing time down from 180ms to 135ms in one case, making it 1.33x faster. Note that integer-to-string conversion is using std::to_string; in theory this could be slower than sprintf or manual conversion, but I haven't found these cases to affect preprocessing time in practice (std::to_string would always use the short string buffer for line/version numbers, and the number of calls is not too significant). |
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| GenericCodeGen | ||
| Include | ||
| MachineIndependent | ||
| OSDependent | ||
| Public | ||
| CMakeLists.txt | ||
| updateGrammar | ||