mulmayoflo fails for W8 and W16 on X86 NCG
test-primops reports this panic:
ghc-9.4.5: panic! (the 'impossible' happened)
GHC version 9.4.5:
shift_amt
Please report this as a GHC bug: https://www.haskell.org/ghc/reportabug
It seems nobody implemented shift_amt
for W8 and W16:
shift_amt = case rep of
W32 -> 31
W64 -> 63
_ -> panic "shift_amt"