Re: [f-cpu] opcodes : missing m4

[jaap stolk <jwstolk@yahoo.com>]

--- Yann Guidon <whygee@f-cpu.org> wrote:
> jaap stolk wrote:
> > --- Yann Guidon <whygee@f-cpu.org> wrote:
  -- snip -- snip --

> ok. do i remove the pipeline stage (with
> tmp_function)
> from eu_rop2_cycle() ? i believe that there
> should
> be no mention of "stalled" in the execution
> units
> ok so i do it.

i just dit the same in the ASU unit.
i was working in 10+ files at once, but it looks
(nearly) ok now. :-)

> mmmm now you manage this in the Xbar so i can simply
> strip the pipeline worries out of ROP2, right ?
yes.

<off topic:>
i came across 
http://www.pullmoll.de/sqrt.htm
today (digging for a smaler GNUmp)

you feed bytes of the number x into this:
( MSByte first )
		dig_c := dig_c  -  1;
		nextd := input AND dmask; 
		nextd := nextd SHR (dig_c*8);
		dmask := dmask SHR 8;
		digit := digit SHL 8;
		digit := digit  +  nextd;
		sub_c := 0;          
		condf := digit  -  subst;
		while condf >= 0 do begin 
		digit := condf;           
		subst := subst  +  2;
		sub_c := sub_c  +  1;
		condf := digit  -  subst;
		end;                      
		outpu := outpu SHL 4;     
		outpu := outpu  +  sub_c;
		subst := outpu SHL 5;     
		subst := subst  +  1;

and it outputs 1/2 byte of sqrt(x) at a time :-) 
( i estimated +/- 130 instructions to do a 
sqrt(32_bit)=16_bit )

jaap



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