GCC Assembler Modifiers

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Hi all,
I have two questions related to the modifiers that can be used with
operands in inline assembly.
1) What does the 'z' mean when added to the operand modifier (e.g. %z0)?
2) In the Input operands list, what is the meaning of 'J' (e.g. ... :
.... : "Jr" (0) )?

I tried to look them up in the online GCC manual but I couldn't find them.

Any help is highly appreciated.

Regards,

--
Mohamed Ahmed Bamakhrama
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85764 Oberschleissheim, Germany
Email: bamakhra@xxxxxxxxxx
Web: http://home.cs.tum.edu/~bamakhra/
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