Explain Branch prediction logic in Pentium.
Branch prediction logic in Pentium: The Pentium microprocessor utilizes branch prediction logic to decrease the time needed for a branch caused by internal delays. Such delays are minimized since when a branch instruction is encountered therefore the microprocessor begins pre-fetch instruction at the branch address. These instructions are loaded in the instruction cache, therefore when the branch arises; the instructions are present and permit the branch to execute in one clocking period. The branch needs an extra three clocking periods to execute, if for any reason the branch prediction logic errors. In most cases, the branch prediction is right and no delay ensues.