Identifying 32 vs 64 bit OS?

Mon Aug 11 10:48:20 PDT 2014

On Mon, 11 Aug 2014 12:51:40 +0000
via Digitalmars-d-learn <digitalmars-d-learn at puremagic.com> wrote:

> Not the OS, but a special CPU instruction: isX86_64() in 
> core.cpuid?
but there is ARM64 coming. and gdc, for example, will has no problems
to support it "out of the box" due to using gcc cogegen. yes, i know
that runtime should be fixed to, but what i want to say is: please,
stop thinking that there is Only One 64-bit CPU.
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