How Intel's 8087 FPU Computed Tangents Using More Than Just CORDIC

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A reverse-engineering analysis of Intel's 8087 floating-point unit has revealed the inner workings of its tangent computation algorithm. The study, published on righto.com, found that the 8087 did not rely solely on the CORDIC method as commonly assumed. The chip's tangent routine appears to incorporate additional techniques beyond standard CORDIC to achieve its results. The findings offer a deeper technical understanding of how this influential 1970s-era math coprocessor handled trigonometric calculations.

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