On Mon, 4 Apr 2011 20:53:35 -0500 "W. Kevin Kelley" <[email protected]> wrote:
:>On Mon, 4 Apr 2011 11:09:29 -0400, O'Brien, David W. (NIH/CIT) [C] :><[email protected]> wrote: :>>Are there any tutorials/samples for writing floating point assembler code. We :>need to work with the z/VM Performance data and it is stored in short floating :>point. Been playing in the Principles of Operation but have a bit of a time :>wrapping my head around floating point manipulation. :>The floating point instructions in some ways are easier to use than the integer :>instructions because you don't have to worry about scaling and implied :>decimal points and all of that. The biggest problem with floating point is :>converting numbers to floating point and from floating point (any of the 3 :>formats). Until the conversion instructions came along to assist in the effort, :>doing the conversions was pretty arcane. Now its easier, but still work. The :>book "IBM Assembler Language Programming" by Sharon Tuggle (long out of :>print I imagine) does discuss the hexadecimal floating instructions and does :>provide sample programs for converting into and out of hexadecimal floating :>point. I was the reviewer for the floating point section. :>I still find TSO TEST useful for testing short segments of Assembler code, and :>one of my frustrations is that it only formats the original 4 floating point :>registers (0, 2, 4 and 6). It hasn't a clue that there are now 16 floating point :>registers or that there are now 3 floating point formats. In general, most :>testing environments give "lip service" to floating point. Why not suggest to IBM that they enhance it? :>W. Kevin Kelley -- IBM POK Lab -- z/OS Core Technical Development Perhaps the office upstairs on the left? -- Binyamin Dissen <[email protected]> http://www.dissensoftware.com Director, Dissen Software, Bar & Grill - Israel Should you use the mailblocks package and expect a response from me, you should preauthorize the dissensoftware.com domain. I very rarely bother responding to challenge/response systems, especially those from irresponsible companies. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
