[Kst] : Huge performance problem under Windows

[Peter Kümmel]

Peter Kümmel wrote:
> Peter Kümmel wrote:
>> atof is dead slow on Windows, on Linux atof is magnitudes faster.
>> Measured with attached patch.
> 
> I've replaced msvc's atof with a old bsd (V7) one, should be good
> enough to read generated data.
> 
> On Linux it is fast as the system atof, but on Windows this code
> makes importing data the first time usable.
> 
> On Windows i only have timing values from a debug build
> (it seems in release mode DataSource::validSource always fails).
> 
> When importing gyrodata.dat the output with attached patch is (numbers are seconds):
> 
> Linux (-O1):
> AsciiSource::readField: sum = 1.0
> AsciiSource::readField: sum = 4.7
> AsciiSource::readField: sum = 9.0
> 
> Windows (debug build):
> AsciiSource::readField: sum = 2.6
> AsciiSource::readField: sum = 11.7
> AsciiSource::readField: sum = 21.5
> 

I've committed the atof replacement for windows.
Now it loads gyrodata.dat within a second.

Peter