URL:
<http://savannah.gnu.org/bugs/?50221>
Summary: FP operations produce unexpected NaNs
Project: Gforth
Submitted by: None
Submitted on: Fri Feb 3 14:21:13 2017
Category: None
Severity: 3 - Normal
Item Group: None
Status: None
Privacy: Public
Assigned to: None
Open/Closed: Open
Discussion Lock: Any
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Details:
Floating point results having a mantissa consisting of FFFF....FFFF or
FFFF....FFFE are considered not a number.
An example calculation triggering this:
1 53 lshift 1 - s>f
1 53 lshift s>f f/
f.
Prints ":" (ie. NaN)
(Other, less artificial examples trigger this behaviour too - i originally
encountered the bug when approximating an integral, where the result was ok
unless i used a higher precision which yielded a result very close to 1.0).
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