Re: is real*8 a standard declaration style?
- From: Ron Shepard <ron-shepard@xxxxxxxxxxxxxxxxxx>
- Date: Mon, 31 Oct 2011 10:37:51 -0500
In article <4eae2d08$0$14314$882e7ee2@xxxxxxxxxxxxxxx>,
Robert Miles <milesrf@xxxxxxxxxxxxxxx> wrote:
You might want to check if that still applies.
The last I knew, the older Intel CPUs that used
a separate FPU chip had the 80-bit format, but
the newer ones with the CPU and the FPU on the
same chip didn't.
I'm not sure what kind of hardware and software integration there is,
but I have a recent i7 intel chip in my laptop and a recent version of
gfortran and it supports 32, 64, and 80-bit floating point declarations
(with KIND values 4, 8, and 10). I have heard that newer gfortran
versions support 128-bit floating point, I assume with KIND value of 16,
but I don't know if this replaces any of the old values or is appended
I also know that many of the old motorola Macintoshes in the 1980's
supported 80-bit floating point through the Apple SANE library. I don't
know what was the hardware and software integration required for this.
In any case, 80-bit floating point support is certainly not rare in
either the current or the past environments.
$.02 -Ron Shepard
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