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Re: [avr-gcc-list] Inline asm constraints...

From: Denis Chertykov
Subject: Re: [avr-gcc-list] Inline asm constraints...
Date: 02 Mar 2001 22:16:57 +0300

Ludovic COURTES <address@hidden> writes:

> Hi !
> I am new to this mailing list but I have already been working for
> two years with avr-gcc on an ATMega103 (i am working in the framework
> of a robotics club in order to participate in the 'e=3Dm6' French Robotic=
> s
> Cup - some of you might know it).
> Some instructions do work only on registers above 15 (such as sbci, and
> most of instructions with immediate values i guess). Therefore, I'd like
> to know if there is a special constraint when writing inline assembler
> to tell gcc to use registers above 15...

Read gcc.info -> Machine Description -> Constraints -> Machine Constraints
Search for "AVR".

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