On Oct 25, 2011, at 4:23 AM, Electron wrote:

>>
>>    digitalWriteFast(3,1);  // compiles to LATxSET =3D b
>> 9d00135c:       24020001        li      v0,1
>> 9d001360:       3c03bf88        lui     v1,0xbf88
>> 9d001364:       ac6260e8        sw      v0,24808(v1)

>> that was digitalWriteFast, I have seen more horrific output from =20
>> the compiler.

That does look pretty optimal for setting an output pin; I'm happy =20
(aside from the lack of optimization when manipulating other pins =20
"nearby" in the code.)  (digitalWriteFast() is a macro to implement =20
the digitalWrite() "standard Arduino function" when all the arguments =20
are constants.  A horrible kludge depending on gcc features and =20
compile-time optimization.  But about 20x faster than the function.

BillW

--=20
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