Re^5: How to find out if it is 32bit or 64bit windows?

It baffled me too

On my linux box, my "-Duselongdouble" build of perl also reports an nvsize (and long double size) of 12 bytes.
IIRC, that equated to 64 bits of precision for the mantissa, and 16 bits for the exponent and sign - the remaining 2 bytes being unused as far as I could tell.

Of course, it may not be the same for you.

Cheers,
Rob

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Re^6: How to find out if it is 32bit or 64bit windows? by BrowserUk (Patriarch) on Jun 27, 2011 at 16:12 UTC
that equated to 64 bits of precision for the mantissa, and 16 bits for the exponent and sign - the remaining 2 bytes being unused Ah! That makes a (little) sense of it. It'd be interesting to see a quick comparison of the performance of 64-bit .v. 80-bit .v. 128-bit. The latter must be an order of magnitude or more slower than the other two? Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error. "Science is about questioning the status quo. Questioning authority". In the absence of evidence, opinion is indistinguishable from prejudice.	[reply]

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Re^6: How to find out if it is 32bit or 64bit windows?
by BrowserUk (Patriarch) on Jun 27, 2011 at 16:12 UTC

that equated to 64 bits of precision for the mantissa, and 16 bits for the exponent and sign - the remaining 2 bytes being unused

Ah! That makes a (little) sense of it.

It'd be interesting to see a quick comparison of the performance of 64-bit .v. 80-bit .v. 128-bit. The latter must be an order of magnitude or more slower than the other two?

Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.

"Science is about questioning the status quo. Questioning authority".

In the absence of evidence, opinion is indistinguishable from prejudice.

[reply]