Hi Janusz,

And thanks for pushing me into reading the ARM Assembly Language book,
so I would be able to do more than just understanding and copy-pasting
the code ;).

It's a lovely instruction set compared to many others.

quoted

quoted

+state:
+	ldr r10, [r9,#FIQ_STATE]
+	cmp r10, #0				@ are we expecting start bit?
+	bne data				@ no - in data processing state

Similarly, an `ldrs' here would make the cmp redundant.

I'm not sure if the S suffix is also valid for memory transfer
instructions

No, you're correct.  Memory transfers can't do the "set ALU flags"
S-bit.  Sorry to mislead.

Cheers,
Ralph.