Re: [f-cpu] New snapshot for EU_INC and EU_CMP

[Just an Illusion <illusion_to_net@yahoo.fr>]

Hello,

Etienne LABARRE wrote:

>Hi all,
>
<cut>

>The precise latency is not important,
> because max latency will be fixed by timing constraints during synthetisis process.
> (It's an explain of my choice of standard function. "Just an
> Illusion"
> will can explain this more easy that me, i think...)
>
In many synthesis tools you can define some critical path and give 
timing constraint to the optimization process, in the current case we 
couldn't predict the latency time in general because that depend of the 
optimization result , and the target technology.
We can ensure a pseudo latency timing if we manually force the mapping 
(use specific 4-and components by example), but in that case our code 
couldn't really migrate between different target technology.
And this type of constraint (if they are generalized) can work against 
optimization process.

The avantage of using normalized, or by default standardized, functions 
is than synthesizer have generally yet optimized this functions and can 
ensure best result with any target technology.

>Etienne.
>
Cheers
Just an Illusion

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