Fujitsu MB91191 Manuel D’Utilisation

44

CHAPTER 3  CPU

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The following commands execute the branch command without delay slot. 

JMP @Ri

CALL label12

CALL @Ri

RET

BRA label9

BNO

label9

BEQ

label9

BNE

label9 

BC

label9

BNC

label9

BN

label9

BP

label9 

BV label9

BNV

label9

BLT

label9

BGE

label9 

BLE label9

BGT

label9

BLS

label9

BHI

label9 

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Operation of ones without delay slots are absolutely executed in command rank order. The instruction

provided immediately before the branch instruction is not executed after branching.

[example]

; Row of instruction

ADD

R1, R2

;

BRA

 LABEL

; Branch instruction (delay slot none)

MOV

R2, R3

; Not executed 

...

LABEL:STR 3 and @R4

; The branch ahead

Execution cycle number for branch commands without delay slots will be 2 cycles branched, or 1 cycle

non-branched. As the appropriate command cannot be inserted into the delay slot, the command code

efficiency is better than the branch command with the delay slot described the NOP instruction. A balance

between execution speed and code efficiency can be struck by selecting either the operation with the delay

slot when effective commands can be set in the delay slot, or the operation without the delay slot when

effective commands cannot be set.