Operation Without Delay Slot - Fujitsu FR60 Hardware Manual

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Operation without Delay Slot

This section describes operation when operations without a delay slot are specified for

a branch instruction.

■ Instructions not Using a Delay Slot

The instructions below execute branch operations without a delay slot:

■ Operation without Delay Slot

In an operation without a delay slot, the instruction is executed by the order of the list.

Instruction immediately after the instruction is not executed before branch.

A branch instruction without a delay slot is executed in two cycles if a branch occurs and in one cycle if no

branch occurs.

Since no appropriate instruction can be placed in the delay slot, branch instructions without a delay slot

result in more efficient instruction codes than branch instructions with a delay slot and with NOP specified.

For both optimal execution speed and code efficiency, select an operation with a delay slot if a valid

instruction can be placed in the delay slot; otherwise, select an operation without a delay slot.

List of instructions

Branch instruction (without a delay slot)

Not executed

Branch destination

Mb91350a series