On Fri, 2 May 2025 at 11:18, Paul Gilmartin < [email protected]> wrote:
> On Fri, 2 May 2025 10:38:10 -0400, Phil Smith III wrote: > > >I can't answer this, but I've seen the x'001234' format called "binary > decimal", which always makes my head hurt a bit. OTOH it's unambiguous, > which is always A Good Thing. > Principles of Operation calls it "unsigned-packed-decimal" format. Unambiguous, but is there hardware support? And for negative values? And > for operations > with mixed packed and "binary decimal"operands. There is explicit hardware support, though somewhat less than there is for the signed-packed-decimal format. There are instructions that convert between unsigned-packed-decimal in storage or a general register and decimal floating point (DFP) . ED and EDMK can handle unsigned-packed-decimal, and of course MVO can convert between unsigned-packed-decimal and signed-packed-decimal in storage. I'm not sure that unsigned-packed-decimal was given a name until DFP came along. Tony H. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
