🚀 go-pugleaf

partain@dcs.gla.ac.UK (Will Partain) writes:

>We are using the GCC `register int foo __asm__("g5")' extension to
>"steal registers" for our Glasgow Haskell system.  We've figured it
>out for Sun4s and Sun3s (the only machines we have here).

>What registers can you get away with stealing on a [34]86?  Some of my
>Linux-toting friends say "none", which is a depressing thought.  Note
>that we are prepared to post-process .s files and/or do other horrible
>things, if it will get us more machine registers for our own use.

I would suggest you forget it. I am not that competent about gcc, but
I do know the Intel crap. Registers are that sparse that almost any
code not too trivial will necessiate reloading. So register assignment
is better left to the compiler instead of doing it yourself.

Try to figure fitting any serious code into the available registers
(say a FFT). And on DOS, segments make the matter really detestable.
Thank god we are not discussing that.
-- 
 David Kastrup        dak@messua.informatik.rwth-aachen.de          
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