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While sqrt is a basic IEEE 754 operation, I have always found rsqrt a more useful quantity (from which I can deduce sqrt anyway).

Are there any plans for a rsqrt primitive or an approximation to it?

Same question about reciprocal rather than a true division although there is potentially less justification for this.

Just curious.

Existing instruction sets have several different instructions for fast reciprocal and fast rsqrt with different precisions. It will be a mess if different hardware implementations have different precision for the same instruction. Therefore, I think these have to be optional implementation-specific instructions.