Re: How to clean up i386 machine description?

[Jan Hubicka <hubicka at horac dot ta dot jcu dot cz>]

> 
> If this is the case, what I suggest you do is to use the extra
> condition field of the patterns to reject invalid combinations of the
> operands.  I did this with the C4x target where I wanted to minimise
> the amount of reloading.  On the x86 you'll probably find that the
This sounds interesting. I am doing that in my move patterns
and it seems to work.
But I am not sure how to use it correctly, because I don't know how
exactly reload choose the parameters.
If I understand correctly it does by alternative, always tries to
match and use the condition filed from insn pattern?
So for example if I use "m,r" constraint and
in condition I use GET_CODE(oeprands[x])!=MEM
I will get "r" constraint?
(just simple example :)

I will definitivly look at C4x patterns.

Honza
> predicates match almost anything but that there are limited
> combinations of valid operands.
> 
> Michael.
> 

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