[libre-riscv-dev] [isa-dev] Re: FP reciprocal sqrt extension proposal

lkcl luke.leighton at gmail.com
Thu Aug 8 07:46:39 BST 2019

Just a thought: should this be merged into Ztrans? A case could be nade either way.

* The Libre RISCV FPDIV pipeline also computes SQRT and RSQRT
* Some OTFC pipeline designs do RSQRT "for free"
* However, if doing RSQRT chances are high it will be part of a design that needs EXP, LOG etc anyway.
* CORDIC can do a ton of algorithms including SQRT, RSQRT, LOG, SIN etc.



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