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Re: out-of-line and arch-specific random_device


On Tue, Aug 28, 2012 at 3:47 AM, Marc Glisse <marc.glisse@inria.fr> wrote:
> I assume they are different enough that they can't all be abstracted
> behind a nice common builtin (with default implementation in libgcc
> and/or a macro advertising fast implementations of it) :-(

What is different is the way to interact with the CPU facility to get
the data.  That's exactly the part I abstracted out in its own
function.  I named it __x86_rdrand() but that's more an historic
accident.  I should have named it __get_random_word.  Then all that
needs to be done for another architecture is to provide a definition
of this function.  The rest can be shared.  But this function needs to
be arch-specific since the details really differ sufficiently.


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