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Re: GCC Assembler Modifiers

From: Segher Boessenkool <segher at kernel dot crashing dot org>
To: bamakhrama at gmail dot com
Cc: gcc-help at gcc dot gnu dot org
Date: Thu, 14 Jun 2007 15:40:02 +0200
Subject: Re: GCC Assembler Modifiers
References: <40378e40706140614q5cce06b6tbf21cea41d2e1e6a@mail.gmail.com>

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.


You need the GCC internals manual instead, "info gccint".
Look at the "machine description" -> "constraints" ->
"machine constraints" section for the "J" thing.  I don't
know where the "%z" thing is documented, perhaps somewhere
in that manual, perhaps in the GCC source code only :-/

Segher

References:
- GCC Assembler Modifiers
  - From: Mohamed Bamakhrama

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