I've run the latest version of master and constexpr branches against
each other and measured the time of "cryptopp.exe v" using Powershell's
Measure-Command on my i7-6500U (slight background noise).
Here are the results:
Configuration
constexpr Time
master Time
x86 Debug
4s 57ms
4s 344ms
x64 Debug
9s 810ms
9s 245ms
x86 Release
doesn't finish!? (RDRAND / RDSEED) doesn't finish!? (RDRAND /
RDSEED)
x64 Release
1s 759ms
1s 735ms
All the times should be taken +-500ms for significance.
(and yes, I'm gonna fire up my debugger to find out why x86/Release
doesn't work)
BR
JPM
Am 06.09.2016 um 15:06 schrieb Jeffrey Walton:
>
> But I get a new (unrelated) compiler warning:
>
> rw.cpp(210): warning C4189: 'n': local variable is initialized but
> not referenced
>
>
>
> Thanks again Marcel. The warning was cleared at
> http://github.com/weidai11/cryptopp/commit/59aad798ebb5302c9b62285c3a9a0d2878cb68e3
> . Its sitting on the dev-branch at the moment.
>
> I also changed the define for CRYPTOPP_CONSTANT at
> http://github.com/weidai11/cryptopp/commit/9205efda02a788084a332bff06733572a338b132
> :
>
> +#if defined(CRYPTOPP_CXX11_CONSTEXPR)
> +# undef CRYPTOPP_CONSTANT
> +# define CRYPTOPP_CONSTANT(x) constexpr static int x;
> +#endif
>
> It did not make a difference under GCC, but it sped up Clang by about
> 100ms to 150ms.
>
> The Visual Studio folks should test this change, too.
>
> Jeff
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