[avr-gcc-list] Assembly constraints in words

[Svein E. Seldal]

Hello,

I want to create an word LPM that is based on the one found in avr-libc, 
only that this new one reads out a complete word, not just a single 
byte. How do I constuct the asm constraint? I want to do the following:

    __asm__ (
        "lpm %0, Z+" "\n"
        "lpm %0+1, Z" "\n"
        : "=e" (__result16)
        : "z" (__addr16)
        : "z"
    );

where i want "%0" to be one of the word registers (but not Z, of course) 
and i want "%0+1" to be this word register +1. I can easily pin it down 
to use a specific register pair, but I would prefer that gcc still can 
select what register to use. Can anyone tell me how, please?

PS! Also note that the asm clobbers the z register. Is there a better 
way to specify that z is input *and* is clobbered?

Svein

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