Branching - prediction system for an instruction pipeline of a computer and method for requesting a command code stored in advance during the execution of a conditional branch instruction

摘要

Branching - forecasting device for an instruction pipeline of a computer, characterized in that it comprises:with the instruction code that is acted upon by a discriminator (2), of the instruction code, it is checked in order to determine whether a conditional program branch is to be machined or not, and for the conditional program branch occurs a representative control signal (s1) generates,a with the instruction code is applied to the predictor (3), which, on the control signal (s1) responds to predict whether or not a condition is satisfied, and of the one for the prediction representative control - flag (s2) is generated, andan address calculation unit (4 / 5) to which the tax - flag (s2) responsive to an address to determine at which the next instruction code is stored, and this address a the instruction counter pc, in order to make it possible that the next instruction code in a clock - repetition period (ø 1 / ø 2) is interrogated, which is divided between a command chains cycle, in which the the conditional program branch instruction code representing is carried out, and another to the command chains cycle adjacent command chains cycle, to an embodiment of the..