[Rd] Two bugs showing up mostly on SPARC systems

Radford Neal radford at cs.toronto.edu
Wed Jul 15 00:08:35 CEST 2015

In testing pqR on Solaris SPARC systems, I have found two bugs that
are also present in recent R Core versions.  You can see the bugs and
fixes at the following URLs:



The first bug, in nls, is most likely to occur on a 64-bit big-endian
system, but will occur with low probability on most platforms.  

The second bug, in readBin, may occur on systems in which unaligned
access to data more than one byte in size is an error, depending on
details of the compiler.  It showed up with gcc 4.9.2 on a SPARC
system. The fix slightly changes the error behaviuor, signaling an
error on inappropriate reads before reading any data, rather than
after reading one (but not all) items as before.

   Radford Neal

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