Instruction decoding in the Intel 8087 floating-point chip

In the 1980s, if you wanted your IBM PC to run faster, you could buy
the Intel 8087 floating-point coprocessor chip.
With this chip, CAD software, spreadsheets, flight simulators, and other programs
were much speedier.
The 8087 chip could add, subtract, multiply, and divide, of course, but it could
also compute
transcendental functions such as tangent and logarithms, as well as provide
constants such as π.
In total, the 8087 added 62 new instructions to the computer....