Is your perl compiled to use long doubles for NV?
I ask because my perl is using normal doubles and I get different results to you:
printf "% 25.32g\n", unpack 'F', pack 'b*', '1000000000000000000000000
+000000000000000000000000000011111111100';;
0.50000000000000011
(In general I think you've hit on at least part of the solution to my quest; though it is complicated by the production of denormals; which I'm still trying to wrap my head around; so I ll get back to you once I've wrapped my brain around them.)
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Not understood.
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