ChipsHackadayabout 4 hours ago
The Adder at the Heart of Intel's 8087 FPU
2 min read
Ken Shirriff's die-level analysis of the Intel 8087 FPU reveals its 69-bit adder, the core component for operations like tangents and cosines. The adder uses 4-bit blocks with a Manchester carry-chain carry-lookahead to speed computation. Intel later switched to the faster Kogge-Stone adder.
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