[Libre-soc-dev] Power ISA v3.0B FP "STORE" function, potential specification discrepancy

Luke Kenneth Casson Leighton lkcl at lkcl.net
Sat May 15 13:55:16 BST 2021

No Denormalization Required (includes Zero / Infin-
ity / NaN)
if FRS1:11 > 896 or FRS1:63 = 0 then
      WORD0:1 <- FRS0:1
      WORD2:31 <- FRS5:34

should that be "FRS[12:63] = 0", testing the mantissa for zero?
or is it genuinely testing "both exponent and mantissa for zero"?


crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68
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