On Sun, 15 Aug 2004 03:03:08 +0200 Mattias Gaertner wrote:
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?
I don´t know about the i386 format. In the past I did extended conversions between i386 and M68k. It was simply done by reversing the ten bytes. So, I assume that the the same holds for double conversion between i386 and PPC too, since the double format of PPC and M68k is exactly the same.
For PowerPC you find a description of the format at the following page:
http://developer.apple.com/documentation/mac/PPCNumerics/PPCNumerics -18.html
which is part of a comprehensive description of the PPC Numerics in Apples documentation:
http://developer.apple.com/documentation/mac/pdf/PPC_Numerics.sit.hqx
A more generic description of the PowerPC can be found here:
http://www-3.ibm.com/chips/techlib/techlib.nsf/techdocs/ 852569B20050FF778525699600719DF2/$file/6xx_pem.pdf
You will find the desired information at page 110.
I suggest to reverse the byte at the PPC side, and to "stream" the doubles to the i386 box, and to assign the double there to an extended variable. In this case there is no need for a special conversion routine between double and extended since this is handled by the math co-processor automatically.
Best regards
Rolf
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