On 2/2/2015 1:39 AM, Johannes Pfau wrote:
No, it doesn't even come close.
* Ports.B += 7 doesn't work.
This should not be done with MMIO because the read and write cycles generated
are ill-defined and vary based on obscure backend details.
In order to implement it you need a
Volatile!ubyte wrapper, return by ref and avoid some compiler bugs
What compiler bugs?
* You do need force-inline to produce halfway decent code
Nope. volatileLoad() and volatileStore() do not produce function calls.
* You also need to enable backend optimization to produce decent code
Not any more true than with volatile types, because the compiler intrinsic
actually translates to a volatile type, not a function call.
You are making a lot of assumptions that volatileLoad() and volatileStore() do
not work. Please try it, examine the generated code, and see.
