id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
13615	Could the performance of spirit::qi::parse() be much worse than std::stod()?	Mario Emmenlauer <mario@…>	Joel de Guzman	"When converting from std::string to numerical formats, I found spirit::qi::parse() to be of superior performance compared to more standard commands like atof() or std::stod() on Linux. Typically it can be at least 4x faster, sometimes even more. This is true on several versions and flavours of Linux.

However I get quite different results on Windows with MSVC, MinGW and the Intel Compiler and on MacOSX.

On Windows and MacOSX spirit::qi::parse() is typically between 2 and 5 times slower than atof() and std::stod() according to my benchmark. I understand that benchmarks are always a bit flaky, but I fail to understand such a huge difference.
"	Bugs	closed	To Be Determined	spirit	Boost 1.67.0	Optimization	invalid	parser, stod, string, double, performance