Re: [f-cpu] New suggestion about call convention

[ben franchuk <bfranchuk@jetnet.ab.ca>]

cedric wrote:

> Well it's not so easy. What append if :
> 
> A call B
> B call C
> C call an external function
> This external function call A.
> 
> You don't have any information about the external function, so you must save 
> all register before calling it (I really mean all, not only the one that used 
> by C, but the one that are used by B too, because B will certainly crash 
> them).
> 

But the point is you have all the calling information.
It may mean a extra pass in the compiler but it can be done.
Also since this works best with leaf functions you could do this with
say three passes.  pass #1 all functions with no calls or system calls
only. pass #2 all functions that call level #1 functions ... pass #3
all functions that call level #2 and #1 functions.
At the same time functions could be tagged for in-line macro 
replacement. The old compile/run time trade off again.


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