david-horner/recip

Reciprical float and rsqrt estimation docs and code / discussion

recip

Reciprical float and rsqrt estimation docs and code / discussion

recip.cc - Andrew's code for generating and testing hard coded n-by-n Look Up Table (LUT)approximations.

revised version accepts arguments for LUT size :

parameters seperated by spaces are
optional index-size(default 7 in bits), estimate size (both in bits 
 these can be followed by\n --verilog to print out LUT table definition 
 --test to test minimal range that covers the LUT table (default) -or-
 --test-long which tests all single float non-NaN values.

Also added is a --nosum directive that suppresses print of informitive and summary parameter info.

and --detail prints LUT entries with details on float values and errors per entry