> /* Delay of exactly 2 Tcy */
> #define delay_2tcy() asm("nop"); asm("nop")

As Chen Xiao Fan indicated, this could be better done using a "goto
$+1" operation: it would take only one word instead of two.

>
> /* Delay of exactly 4 Tcy */
> #define delay_4tcy() delay_2tcy(); delay_2tcy()

Depending on available stack space, you could implement this by a
"call <return statement somewhere in your current code block>": it
would still only take one word instead of four (or two if you use the
change above).

>
> /* Delay of exactly 5 Tcy */
> #define delay_5tcy() delay_4tcy(); delay_1tcy()
>
> /* Delay of exactly 10 Tcy */
> #define delay_10tcy() delay_5tcy(); delay_5tcy()

Note that at some point it will become better making a small loop
using decfsz and goto $-1.

Good luck!

Greetings,
Maarten Hofman.

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