On Dec 9, 2010, at 08:36, Tom Marchant wrote: > On Thu, 9 Dec 2010 06:23:45 -0700, Paul Gilmartin wrote: > >> I understand that on z/OS Java has a special dispensation to use >> storage within the bar. > > I wish you wouldn't write "within the bar". It suggests that > the bar has thickness, which it does not. Addresses up to and > including 7FFFFFFF are below the bar. Addresses from 80000000 > and up are above the bar. "Special dispensation" is not needed. > ... > As to Java, this was discussed on IBM-MAIN. See, for example, > this post from Jim Mulder: > http://www.mail-archive.com/[email protected]/msg108339.html > Wherein he quotes ??? quoting Ed Jaffe's reference to the "the previously 'thick' bar", so my usage, however deprecated, may be no worse than being outdated.
Doublewords are somewhat magical in storage management. A 32-bit word can refer to 4Gi doublewords, which is 32GiB, which may motivate a boundary at that point. -- gil
