Re: [avr-gcc-list] Add builtins in avr target.

[Anatoly Sokolov]

Hi.

> Why can not this be done with library/inline functions?

I consider that use builtins  allows to realize universal delay function 
easier. Also use builtins will allow to the same delay funcianality it ADA 
language.

> Why does delay always have to be constant?

If to allow input parameter to be a variable then it will be necessary to 
perform division in run-time. It to add a unpredictable delay.
 
> How do we document functionality - for example resolution limitations?

"The  '__builtin_avr_delay_cycles (unsigneg long __n)' perform a delay of 
minimum __n cycles."

> How is this different from IAR?

I do not know. Im don't have IAR C installed.

Anatoly.