[fpc-devel] Extended in Win64

petr.kristan at epos.cz petr.kristan at epos.cz
Tue May 6 15:26:54 CEST 2008

On Tue, May 06, 2008 at 03:02:19PM +0200, petr.kristan at epos.cz wrote:
> Hi.
> Why on Win64 on AMD64 is Extended type 64bit same as double and on Win32, Linux32 and
> Linux64 is 80bit. It breaks for example this construction:
> procedure Swap(var X, Y: Double); overload;
> procedure Swap(var X, Y: Extended); overload; 
> (I know that extended type is defined as float with the best precision on the
> given platform.)

I now found some explanations:

And explanation that 80-bit precision on AMD64 is depracated and should be
replaced by SIMD.


Ing. Petr Kristan
EPOS PRO s.r.o., Bozeny Nemcove 2625, 530 02 Pardubice
tel: +420 466335223    Czech Republic (Eastern Europe) 
fax: +420 466510709

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