| slovo | definícia |
branch prediction
(foldoc) | branch prediction
A technique used in some processors
with instruction prefetch to guess whether a {conditional
branch} will be taken or not and prefetch code from the
appropriate location.
When a branch instruction is executed, its address and that of
the next instruction executed (the chosen destination of the
branch) are stored in the Branch Target Buffer. This
information is used to predict which way the instruction will
branch the next time it is executed so that instruction
prefetch can continue. When the prediction is correct (and it
is over 90% of the time), executing a branch does not cause a
pipeline break.
Some later CPUs simply prefetch both paths instead of trying
to predict which way the branch will go.
An extension of the idea of branch prediction is {speculative
execution}.
(1998-03-14)
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