Methods and devices for determining branch history for branch prediction

摘要

Disclosed are methods and processing devices aimed at determining global branch history for branch prediction. The method shifts the first bit of the branch signature to the current global branch history, the second bit of the branch signature, and the shifted bits of the current global branch history, bit by bit exclusive logic. Performing a sum (XOR) function. In this way, the current global branch history is updated. The processing device stores bits representing the current global branch history, shift logic configured to shift, a register configured to store the current global branch history, and whether a branch has taken place. The method is implemented using a discriminator circuit configured to discriminate and an XOR gate. [Selection] Figure 4