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That's actually a common optimization, e.g, Itanium doesn't have divide; just reciprocal. It's a bit more interesting than that: The Itanium doesn't have a rec
by microtherion 14y ago
That's actually a common optimization, e.g, Itanium doesn't have divide; just reciprocal.
It's a bit more interesting than that: The Itanium doesn't have a reciprocal either, just an approximation of the reciprocal accurate to about 9 bits, which can then be refined if more accuracy is needed.
- mechagodzilla 14y agoThat's the same way the Cray-1 does it. It uses 3 passes of newton's method (and I think is accurate to 28 bits for the first time through).