I need to do a multiplication in the keil and the following mistake goes out for me. It does not leave me to use MLU and MUL. Why?
error: A1477W: This register combination results in UNPREDICTABLE behaviour
agree.
your fault is to write asm code in the c style.
I guess "MLA R9,R3,R4,R2" will work.
In fact,
MLA R3,R4,R3,R2
will do.
Regards Marcus http://www.doulos.com/arm/