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72 FUJITSU MICROELECTRONICS LIMITED CM71-00105-1E
CHAPTER 5 PIPELINE OPERATION
5.1
5.1.2 Floating Point Pipeline
The floating point pipeline is a 6-stage pipeline used to execute floating point calculations. The IF stage
and ID stage are common with the integer pipeline.
The floating point pipeline has the following 5-stage configuration.
• IF Stage: Fetch Instruction
Instruction address is generated and instruction is fetched.
• ID Stage: Decode Instruction
Fetched instruction is decoded. Register reading is also carried out.
• E1 Stage: Execute Instruction 1
Computation is executed. Multiple cycles may be required depending on the instruction.
• E1 Stage: Execute Instruction 2
The result is rounded and normalized.
• WB Stage: Write Back to register
Computation result is written in the register.