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Date:      Thu, 31 Oct 2013 09:27:34 -0400
From:      Mehmet Erol Sanliturk <m.e.sanliturk@gmail.com>
To:        freebsd-numerics@freebsd.org
Subject:   Representation of 128 bit floating point numbers in FreeBSD amd64 and Clang
Message-ID:  <CAOgwaMs=NKfDpjOY9=5+KYFUdbzeMpxMF_nxZP21y8RTb_cR9w@mail.gmail.com>

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Dear All ,


There are three kind of floating point numbers beside single precision
numbers :


http://en.wikipedia.org/wiki/Double_precision
( 64 bits )

http://en.wikipedia.org/wiki/Extended_precision
( 80 bits )


http://en.wikipedia.org/wiki/Quadruple-precision_floating-point_format
( 128 bits )


In Fortran , it is possible to define the following :

REAL ( KIND = 8 ) ,
DOUBLE PRECISION  : 64 bits ,

REAL ( KIND = 10 ) : 80 bits ,

REAL ( KIND = 16 ) : 128 bits ( 34 digits ) .


In FreeBSD amd64 and Clang ,
how can I represent 128 bits ( 34 digits ) variables ?


The following are available :

double : 17 digits
long double : 21 digits





Thank you very much .

Mehmet Erol Sanliturk



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