[llvm-dev] Incorrect return values for APFloat::convertFromString?
Mueller-Roemer, Johannes Sebastian via llvm-dev
llvm-dev at lists.llvm.org
Wed Mar 2 07:47:43 PST 2016
I noticed some odd behavior with APFloat's convertFromString method.
1. If I pass the hex representation of the closest value to 0.1 (0x19999Ap-24), everything is fine and opOk is returned. However, if I pass the same value as a decimal string (0.10000002384185791015625), opInexact is set.
2. On the lower end of the scale, the smallest denormal 0x1p-149 returns opOk, but the slightly larger value 0x1.8p-149 has opUnderflow set and (as expected) opInexact.
Is this behavior correct?
--
Johannes S. Mueller-Roemer, MSc
Wiss. Mitarbeiter - Interactive Engineering Technologies (IET)
Fraunhofer-Institut für Graphische Datenverarbeitung IGD
Fraunhoferstr. 5 | 64283 Darmstadt | Germany
Tel +49 6151 155-606 | Fax +49 6151 155-139
johannes.mueller-roemer at igd.fraunhofer.de | www.igd.fraunhofer.de
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