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22. Branch Target Buffer、2-bit Predictor、CSEL
#CC-05-022
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Branch Target Buffer
2-bit Predictor
CSEL
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Which of the following statements about branch prediction and conditional execution is (are) true?
A
(a) The Branch Target Buffer (BTB) is typically accessed during the instruction decode stage to enable early redirection.
B
(b) Indirect branches, such as those used in switch statements, are generally easier to predict than conditional branches because their targets remain fixed once the branch outcome has been resolved.
C
(c) The 2-bit dynamic branch prediction scheme improves prediction accuracy primarily by exploiting global branch history and correlations among nearby branches.
D
(d) Programs that use the CSEL instruction in ARMv8 architecture can potentially reduce the number of conditional branch instructions by replacing control flow with conditional data selection.
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