The Pentium contains a complicated circuit to multiply by three
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from tedu@inks.tedunangst.com to inks@inks.tedunangst.com on 14 Mar 23:21
https://inks.tedunangst.com/l/5191
from tedu@inks.tedunangst.com to inks@inks.tedunangst.com on 14 Mar 23:21
https://inks.tedunangst.com/l/5191
In 1993, Intel released the high-performance Pentium processor, the start of the long-running Pentium line. I’ve been examining the Pentium’s circuitry in detail and I came across a circuit to multiply by three, a complex circuit with thousands of transistors. Why does the Pentium have a circuit to multiply specifically by three? Why is it so complicated? In this article, I examine this multiplier—which I’ll call the ×3 circuit—and explain its purpose and how it is implemented.
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