[retroforth] Re: ztype in assembler
- From: "Helmar Wodtke" <helmwo@xxxxxx>
- To: retroforth@xxxxxxxxxxxxx
- Date: Thu, 27 Jan 2005 00:52:57 +0100
retroforth@xxxxxxxxxxxxx schrieb am 27.01.05 00:42:25:
>
> This is slightly smaller and faster:
But does not work correctly when a zero-length string is there... That will
happen when interfacing C-libraries.
In old "real 8086" times, there was a trick to hide unneeded instructions at
the beginning of a loop:
> code 'ztc', _ztc
> dup
*** db 0xB2 ; code for MOV DL,...
> .a: inc eax
> cmp byte [eax], 0
> jnz .a
> sub eax, [esi]
> next
But I dont think this is a good thing today :) Could confuse the processor more
than it helps.
> I would be interested to test on my Intel CPU at home...
Let me hear if you have results.
Bis dann,
Helmar
helmwo@xxxxxx
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