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What's the purpose of vfrsqrt and vfrec7.v? #882

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lygstate opened this issue May 23, 2023 · 1 comment

lygstate commented May 23, 2023

No description provided.

dkravitz-sifive commented May 23, 2023

To provide a seed value for a Newton-Raphson routine to quickly calculate a sufficiently-accurate value. Per notes in the RVV spec:

The 7 bit accuracy was chosen as it requires 0,1,2,3 Newton-Raphson iterations to converge to close to bfloat16, FP16, FP32, FP64 accuracy respectively.

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