[Development] CSPRNG vs DPRNG
Thiago Macieira
thiago.macieira at intel.com
Thu Oct 12 23:37:44 CEST 2017
On Thursday, 12 October 2017 10:58:25 PDT Thiago Macieira wrote:
> Oops, if I mask off then I need to change the number I'm dividing by. New
> implementation:
>
> static double generateDouble()
> {
> // use generate64() to get enough bits
> quint64 x = generate64();
> quint64 limit = Q_UINT64_C(1) << std::numeric_limits<double>::digits;
> x >>= std::numeric_limits<quint64>::digits -
> std::numeric_limits<double>::digits;
> return double(x) / double(limit);
> }
And I've found bugs in the LLVM and MSVC implementations, and something I'm
not sure is a bug in those and GCC.
https://codereview.qt-project.org/208317
--
Thiago Macieira - thiago.macieira (AT) intel.com
Software Architect - Intel Open Source Technology Center
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