System and method for processing jump instruction of microprocessor in branch prediction way
A technique of jump instruction and branch prediction, applied in the direction of concurrent instruction execution, machine execution device, etc., can solve the problems of complex and unsuitable branch prediction methods, and achieve the effect of simple branch prediction methods
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example 1
[0073] Example 1. In this example, there are 8 items in the operation queue, that is, 8 instructions can be executed in the pipeline at the same time. It is assumed that there are already three instructions in the operation queue, and the queue head pointer points to the second instruction. First, the decoding module decodes the instructions fetched by the instruction fetching module; in order to speed up branch prediction, pre-decode these instructions while decoding, and then perform branch prediction according to the pre-decoding results. After pre-decoding, it is found that the first instruction is a branch likely instruction, so it is predicted to jump, and the jump execution flag (blikely flag) of the decoding bus is set to 1; the second instruction is The delay slot instruction for this instruction. Then these two instructions are sent to the operation queue. Among them, the first instruction is written into the fourth item of the operation queue, and the blikely flag...
example 2
[0077]Example 2. In this example, there are 8 items in the operation queue, that is, 8 instructions can be executed in the pipeline at the same time. It is assumed that there are already three instructions in the operation queue, and the queue head pointer points to the second instruction. First, the decoding module decodes the instructions fetched by the instruction fetching module; in order to speed up branch prediction, pre-decode these instructions while decoding, and then perform branch prediction according to the pre-decoding results. After pre-decoding, it is found that the first instruction is an ordinary jump instruction, and whether it jumps is predicted according to the branch predictor. And set the blikely flag of the decoding bus to 0; the second instruction is the delay slot instruction of this instruction. Then these two instructions are sent to the operation queue. The first instruction is written into the fourth item of the operation queue, and the blikely f...
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