custom instructions implementation

Dash,

1. I don't know

2. Maybe related to your VHDL description. If it is not a big secret post it, or send me a message.

3. The compiler itself will never use your custom instructions to optimise code. Because the compiler is not build with this information. You have to change and rebuild the compiler for that (what you propably don't want to do).

The only code that will use the custom instruction is if you call the macro.

(there is an exception for flating point instructions, where altera build support for it into the compiler, it is however a job for specialists to do that).

Stefaan