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Mailing lists / fpc-pascal / 2004-08

How to convert between double and extended?

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Mattias Gaertner

Hi,

How can I convert between PowerPC double and i386 Extended on a powerpc? For example: I want to save a Double under powerpc to a stream as i386 Extended and read it under i386 as Extended.

Are there already some conversion functions to convert between the various floating point formats?

Mattias

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Jonas Maebe
to Mattias Gaertner
Mattias Gaertner wrote 8 lines
How can I convert between PowerPC double and i386 Extended on a powerpc? For example: I want to save a Double under powerpc to a stream as i386 Extended and read it under i386 as Extended. Are there already some conversion functions to convert between the various floating point formats?

No, only a function to convert a TP real to double (real2double). Also, on the ppc extended is defined as double (for source code compatibility), so we'll have to use a record or so.

Jonas

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Mattias Gaertner
to Jonas Maebe
Show quoted text 15 lines
On 14 aug 2004, at 19:34, Mattias Gaertner wrote: > How can I convert between PowerPC double and i386 Extended on a > powerpc? > For example: I want to save a Double under powerpc to a stream as i386 > Extended and read it under i386 as Extended. > > Are there already some conversion functions to convert between the > various > floating point formats? No, only a function to convert a TP real to double (real2double). Also, on the ppc extended is defined as double (for source code compatibility), so we'll have to use a record or so.

That's why I asked.

Where can I get information about the i386 extended and the ppc double format? Is it correct, that the ppc double is simply a reversed i386 double?

Mattias

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Florian Klaempfl
to Mattias Gaertner
Mattias Gaertner wrote 24 lines
On Sun, 15 Aug 2004 00:11:16 +0200 Jonas Maebe wrote: >On 14 aug 2004, at 19:34, Mattias Gaertner wrote: > > >>How can I convert between PowerPC double and i386 Extended on a >>powerpc? >>For example: I want to save a Double under powerpc to a stream as i386 >>Extended and read it under i386 as Extended. >> >>Are there already some conversion functions to convert between the >>various >>floating point formats? > >No, only a function to convert a TP real to double (real2double). Also, >on the ppc extended is defined as double (for source code >compatibility), so we'll have to use a record or so. That's why I asked. Where can I get information about the i386 extended and the ppc double format? Is it correct, that the ppc double is simply a reversed i386 double?

Yes. rtl/inc/real2str.inc around 260 shows how to split the different float types.

Show quoted text 7 lines
Mattias _______________________________________________ fpc-pascal maillist - http://lists.freepascal.org/mailman/listinfo/fpc-pascal

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