Inside the Intel 8087 chip: floating-point addition and subtraction

· Ken Shirriff · Oct. 18, 2026, 5:07 p.m.
Summary
This post dives deep into the Intel 8087 chip, explaining how it performs floating-point addition and subtraction through its complex microcode and circuitry. It covers the architecture of the chip, the intricacies of floating-point arithmetic, the importance of special cases (like zero and infinity), and concludes with a look at the evolution of floating-point standards influenced by the 8087.
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