May 2024
Intermediate to advanced
889 pages
30h 8m
English
book
The X 86 Microprocessors: Architecture, Programming and Interfacing (8086 to Pentium) 2nd Edition by Pearson
by Lyla B. Das
Content preview from The X 86 Microprocessors: Architecture, Programming and Interfacing (8086 to Pentium) 2nd Edition by Pearson
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15-34
THE
x86 MICROPROCESSORS
Table 15.3 shows the example of our daily travel and this can be used to illustrate a two-
bit predictor. Note that a wrong decision occurs only once; that is, on a Sunday. This
is because on that day, the two previous history bits were TT, but the actual is N. On
Monday, the history changes to TN, but the prediction still is T. (Only if two Ns occur
together, will the prediction change to N).
It seems obvious that we can use more history bits for better prediction. However,
in practice, it has been found that two-bit predictors perform well enough. For more
advanced processors, there are better predictors that trace ...
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