PL/I

PL/I

PL/I

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  • 1.  Difference in FLoating point operations between Enterprise PL1 , IBM PL1 for AIX , Open PLI

    Posted Sat April 14, 2012 01:54 PM
     One of our Customers is running Business Logic in Enterprise PL1 for zOS  , IBM PL1 for AIX , Open PL1 on Windows . Customer is looking at consolidating all Business Logic in IBM PL1 for AIX . Towards this wanted to understand a) Differences in   FLoating Point operations between the three PL1 implementation b) Differences in Levels of Precision provided by the three PL1 Implemntation .   In General any documentation on comparisons between the implementations (atleast  zOS , AIX) would be usefull in highlighting the risks to the customer
    PavankumarM


  • 2.  Re: Difference in FLoating point operations between Enterprise PL1 , IBM PL1 for AIX , Open PLI

    Posted Mon April 16, 2012 04:26 PM
    PL/I on Z/OS supports hexadecimal float, IEEE float binary, and IEEE float decimal. However, PL/I for MVS and earlier PL/I compilers supported only hexadecimal float, and hence almost all float data used by z/OS PL/I programs is in hexadecimal format. PL/I on AIX supports IEEE float binary. These 2 formats all have a short, long and extended format, but the numbers have different values for the exponent ranges supported and for the values held in the mantissa. There are more details in the Language Reference Manual.
    pelderon


  • 3.  Re: Difference in FLoating point operations between Enterprise PL1 , IBM PL1 for AIX , Open PLI

    Posted Thu April 19, 2012 07:42 AM
    Are PL1 Macros supported in IBM PL1 for AIX
    PavankumarM


  • 4.  Re: Difference in FLoating point operations between Enterprise PL1 , IBM PL1 for AIX , Open PLI

    Posted Thu April 19, 2012 11:45 AM
    yes, the macro facility is identical across PL/I for z/OS. AIX, and Windows
    pelderon


  • 5.  Re: Difference in FLoating point operations between Enterprise PL1 , IBM PL1 for AIX , Open PLI

    Posted Sun April 29, 2012 09:59 AM
    Can  IBM PL1 on  AIX emulate HEX FLoat on zOS PL/I.  . Does IBM PL1 on AIX have the same Run Time Library as IBM COBOL on AIX
    PavankumarM


  • 6.  Re: Difference in FLoating point operations between Enterprise PL1 , IBM PL1 for AIX , Open PLI

    Posted Mon April 30, 2012 05:12 PM
     Yes, IBM PL/I can emulate hex float on AIX, but this will not perform as well as using native float.
     
    And PL/I for AIX has a separate library from COBOL for AIX
    pelderon


  • 7.  Re: Difference in FLoating point operations between Enterprise PL1 , IBM PL1 for AIX , Open PLI

    Posted Mon April 30, 2012 11:27 PM
     Thanks for the clarifications . Currently the Customer uses CMPAT(V1) as the default COmpiler option while compiling Programs on zOS .  Does this indirectly corespond to HEX Float usage
     
    For High precision requirements , precompiler options(LIMITS( FIXEDBIN(31,63),FIXEDDEC(15,31))) is used . Wanted to understand how this improves precission as I understand that Floating Point Binary/ Decimal is not in effect
    PavankumarM


  • 8.  Re: Difference in FLoating point operations between Enterprise PL1 , IBM PL1 for AIX , Open PLI

    Posted Tue May 01, 2012 11:20 AM
     the CMPAT option has nothing to do with float usage in any way
     
    the FIXED BIN and FIXED DEC limits also have nothing to do with float usage. However, they clearly allow for more digits in FIXED computations
    pelderon


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