hello i have an opcode of BNE branch which is 1AFFFFF9 and i want to know to which address go this branch i mean how i know what is the next address executed
A number of processors have support for conditional processing of instructions. That means that when they reach the instruction (in this case the second instruction), it checks a processor flag to decide if it should process the instruction or treat it as a NOP instruction and continue to the third instruction.
The second instruction in this case is only performing a comparison if the first instruction found a match.
The third instruction is also conditional. So it will only perform an ADD if the previous two instructions both compared equal. So the add only happens if instr1 arg1 == arg2 and instr2 arg1 == arg2.
If instruction 2 sees a difference, then both second and third instructions will be treated as "NOP" instructions. If first instruction matches, and second instruction sees a mismatch, then the third instruction will be treated as a "NOP".
So the only relation involved is that the conditional instructions will be processed or not, based on the result of previous instructions.
Indeed.
But note that the decision to execute or not relies only on the flags - there is no relation between the instructions themselves.
In other words, it doesn't matter what instruction set the flags; it's only the state of the flags that matters.
I hope the distinction is not too subtle that it gets lost in translation...
thank you very much for your help