IBM marks its centennial today. As part of our 100 days of celebration, IBM highlighted 100 of its best achievements in the Icons of Progress site. FORTRAN is featured as the March 3rd icon. Since its release in 1957, the Fortran language has continued to evolve, with the latest versions adding object-orientation, parameterized derived types, and distributed programming. No one knows what innovations the next 100 years will bring, but who knows, Fortran's innovation, longevity, and high performance might be highlighted in the next... [More]
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The April 2012 Update for XL Fortran Advanced Edition for Blue Gene/P, V11.1 is now available at the following link and on Fix Central: April 2012 Update for XL Fortran Advanced Edition for Blue Gene/P, V11.1 Can't find the updates for your compilers? Check out our C/C++ compilers latest updates page here .
The XL Fortran for AIX Fix Pack 19 (August 2014 PTF) for 13.1 is now available at the following links and on Fix Central : XL F ort r an f or A IX F ix P ack 19 (August 20 1 4 P T F) f or V 13 . 1 F i x l i s t f o r X L F o r t r a n f o r A I X XL F ort r an R unt i me f or A IX F ix P ack 19 (August 20 1 4 U p dat e ) f o r 1 3 . 1 F i x l i s t f o... [More]
The XL Fortran for Linux, 15.1 and XL Fortran for AIX, 15.1 introduced the -qpath option , which is functionally similar to the -t and -B combination but more convenient. You can use -qpath to specify substitute path names for XL Fortran components, such as the assembler, C preprocessor, and linker. The -qpath option is more feasible than the -t and -B combination, as you can use the -qpath option to specify more than one component, each with a different path. This can bring convenience as you needn’t copy all specified components to the... [More]
When compiling with compiler invocations conforming to earlier Fortran standards, you can specify -qxlf2008=checkpresence to check the dummy argument presence according to the Fortran 2008 standard . The default for the f2008 , xlf2008 , and xlf2008_r commands is checkpresence , and if you decide that dummy argument presence should be checked according to previous Fortran standards, specify -qxlf2008=nocheckpresence . The difference is as follows. According to Fortran 2008 standard, a dummy argument or an entity that is host associated... [More]
Now there’s an even easier way to get you started with your evaluation of the latest XL C/C++ (V13.1.1) and XL Fortran (V15.1.1) for Linux compilers for the little endian Linux distributions on Power Systems (Ubuntu 14.04, Ubuntu 14.10, and SLES 12). We are now hosting the latest evaluation versions on public apt-get and zypper repositories. You can find everything that you need to get started at http ://p ubli c.dh e.ib m.co m/so ftwa re/s erve r/PO WER/ Linu x/xl -com pile r/ev al/p pc64 le /
If your code contains a large number of loops, you can use option -qassert=minitercnt= n1 and -qassert=maxitercnt= n2 provided in XL Fortran V14.1 to specify the expected minimum and maximum iteration counts of the loops in the program. The minitercnt and maxitercnt values are not required to be accurate since the values only affect performance, never correctness. The values will be provided to the optimizer. n1 and n2 must be positive integers. If you specify the two suboptions at the same time, the values must follow the rule... [More]
XL Fortran for Linux Fix Pack 6 (February 2014 Update) for 14.1 is now available at the following links and on Fix Central: XL Fortran for Linux Fix Pack 6 (February 2014 Update) for 14.1 Fix list for XL Fortran for Linux XL Fortran Runtime for Linux Fix Pack 6 (February 2014 Update) for 14.1 Fix list for XL Fortran Runtime for Linux Fixed APARs... [More]
The December 2011 Compiler and RTE PTFs for XL Fortran Enterprise Edition for AIX, V11.1 are now available at the following links and on Fix Central : December 2011 PTF for XL Fortran Enterprise Edition for AIX, V11.1 December 2011 PTF for XL Fortran Enterprise Edition for AIX, V11.1 RTE Can't find the updates for your compiler? Check out our Fortran compiler latest update page here .
The history of the Fortran language can be traced straight to IBM. Fortran was originally proposed by John Backus in 1953, and the initial Fortran compiler, for IBM mainframe computers, was delivered in 1957. Fast-forward to today, and Fortran is widely used on the field of High-Performance Computing. It has become an ANSI standard, and has been implemented on all major platforms on this space. What makes Fortran successful on this space is its ability to provide developers with very good performance for numerical computation withour requiring... [More]
XL Fortran for Linux Fix Pack 7 (May 2014 Update) for 14.1 is now available at the following links and on Fix Central: XL Fortran for Linux Fix Pack 7 (May 2014 Update) for 14.1 Fix list for XL Fortran for Linux XL Fortran Runtime for Linux Fix Pack 7 (May 2014 Update) for 14.1 Fix list for XL Fortran Runtime for Linux Fixed APARs are listed on... [More]
The XL Fortran for AIX Fix Pack 9 (October 2014 PTF) for 14.1 is now available at the following links and on Fix Central: XL Fortran for AIX Fix Pack 9 (October 2014 Update) for 14.1 Fix list for XL Fortran for AIX XL Fortran Runtime for AIX Fix Pack 9 (October 2014 Update) for 14.1 Fix list for XL Fortran Runtime for AIX Can't... [More]
The Fortran 2008 standard relaxes some rules for internal procedures. Procedure pointers can now point to internal procedures. In addition, you can use internal procedures and pointers to internal procedures as actual arguments. Because an internal procedure has access to the variables of its host procedure, procedure pointers to an internal procedure can only be used before the host procedure completes its execution. Here is an example of a procedure pointer to an internal procedure: module m implicit none... [More]
In IBM XL Fortran for Linux, V15.1 and IBM XL Fortran for AIX, V15.1, a new Fortran 2008 intrinsic function has been added to let you inquire the location of the first or last matching of the wanted value in an array along the specified dimension. Function FINDLOC returns the subscript of the element of wanted value using positive integers. The complete format is FINDLOC(ARRAY, VALUE, DIM, MASK, KIND, BACK) where DIM, MASK, KIND and BACK are optional. The result indicates the subscript of the location of the masked element of ARRAY whose value... [More]