TSK3000A Core Instruction - BNE

Instruction:

Branch On Not Equal

Assembler Format:

bne rA, rB, target

Example:

bne $3, $4, _myfunc

Description:

Generates a branch target address by adding the address of the instruction in the delay slot to a signed offset (a 16-bit immediate value, IMM16, calculated from the target operand, left-shifted two bits and sign-extended to 32 bits). The contents of GPRs rA and rB are compared and, if not equal, the program branches to the target address after a delay of one instruction cycle.

Operation:

If rA <> rB Then
   PC <-- PC + 4 + SignExtend(IMM16 * 4)
Else
   PC <-- PC + 4

Instruction Type:

I-Type

Instruction Fields:

rA = Register index of operand A

rB = Register index of operand B

target = a symbolic address label or a hard-coded PC-offset in bytes