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IBM XL C Enterprise Edition for AIX, V9.0 Exploits the Capabilities of the IBM POWER6 Processors

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IBM XL C Enterprise Edition for AIX, V9.0 Exploits the Capabilities of the IBM POWER6 Processors IBM Canada Ltd. Announcement A07-1516, dated June 5, 2007 IBM XL C Enterprise Edition for AIX, V9.0 exploits the capabilities of the IBM POWER6 processors Description .................................................2 At a glance Product positioning .................................... 3 XL C Enterprise Edition for AIX, V9.0 adds the following new features: • Specific optimizations for the latest POWER6 processors • Additional new features and enhancements for increased performance and optimization tuning • Additional built-in functions • New or changed compiler options Overview XL C Enterprise Edition for AIX®, V9.0, a highly advanced optimizing compiler for the AIX operating system, runs on the PowerPC® architecture, including the POWER6™ processors. The compiler is an industry standards-based professional programming tool that can be used for developing large, complex, computationally intensive 32-bit and 64-bit applications in the C programming language. XL C Enterprise Edition for AIX, V9.0 is the follow-on release to IBM XL C Enterprise Edition, V8.0 for AIX. The XL family of IBM compilers now includes • XL C Enterprise Edition (AIX and PASE) • XL C/C++ Enterprise Edition (AIX and PASE) • XL C/C++ Advanced Edition (Linux™) • XL C/C++ (z/OS®) • XL C/C++ Advanced Edition (Blue Gene®/L) • XL Fortran Enterprise Edition (AIX and PASE) • XL Fortran Advanced Edition (Linux) • XL Fortran Advanced Edition (Blue Gene/L) The C and C/C++ family of products also includes C/C++ for z/VM®. The XL C compiler has the ability to optimize and tune your application code for execution on IBM System p™ servers supporting the POWER3™, POWER4™, POWER5™, POWER6, and PowerPC architectures, including the PowerPC 970 processor within the IBM BladeCenter® JS20 and BladeCenter JS21. With the V9.0 release, the XL C compiler exploits, optimizes, and tunes the latest POWER6 architecture for the System p5™ servers and PowerPC processor-based blades. The XL C compiler also supports the POWER4 and POWER5 architectures on IBM System i™ with the i5/OS™ Portable Application Solutions Environment (i5/OS PASE). IBM Canada Ltd. Announcement A07-1516 IBM is a registered trademark of International Business Machines Corporation 1 What's new • Support for the new POWER6 processors • Addition of decimal floating-point support for C • Upgrade of default language level option for C to extc99 allowing you to use C99 features and headers without having to explicitly specify extc99 in a suboption • New default settings for -qarch and -qtune to tune generated code for optimized performance across a range of recent processor architectures, including POWER6 Key prerequisites • System p servers and PowerPC processor-based blades supported by AIX 5L™ V5.2 or AIX 5L for POWER™ V5.3 • Disk space: 350 MB Planned availability dates • June 8, 2007: Electronic software delivery • July 6, 2007: Physical software delivery Description The XL C compiler continues to provide additional functionality and enhancements, especially in the areas of performance and optimization, support for language enhancements, and support for new processors. Support for the new POWER6 processors With V9.0, the XL C compiler exploits, optimizes and tunes for the latest POWER6 processors. XL C V9.0 expands the list of -qarch and -qtune suboptions to support the newly available POWER6 processors. Decimal floating-point arithmetic Decimal floating-point arithmetic offers greater computational performance and precision in business and financial applications where numeric data computation and I/O is usually performed in decimal form. Data conversions from decimal type to binary floating-point type and back are avoided, as are inherent rounding errors accumulated during data conversions. XL C adds support for decimal floating-point arithmetic with the following new compiler options: • -qdfp: Specifying -qdfp enables compiler support for decimal floating-point data types and literals • -qfloat=dfpemulate: Specifying -qfloat=dfpemulate instructs the compiler to use software emulation when handling decimal floating-point computations. Note: Compiler support for decimal floating-point operations requires AIX 5L for POWER V5.3 with the 5300-06 Technology Level. Default language level change for C — extc99 The default -qlanglvl compiler option setting is now extc99 when invoking the C compiler with the xlc invocation. This change will allow you to use C99 features and headers without having to explicitly specify the extc99 suboption. You can revert to previous xlc behavior by specifying -qlanglvl=extc89 when invoking the compiler. Architecture and processor support The -qarch and -qtune compiler options control the code generated by the compiler. These IBM Canada Ltd. Announcement A07-1516 IBM is a registered trademark of International Business Machines Corporation 2 compiler options adjust the instructions, scheduling, and other optimizations for a specified target processor or range of processors. New default setting for -qarch, -qtune • -qarch=ppc • -qtune=balanced The -qtune=balance suboption is new for this release and becomes the default -qtune setting when certain -qarch settings are specified. Using -qtune=balance instructs the compiler to tune generated code for optimized performance across a range of recent processor architectures, including POWER6. New compiler options for POWER6 processors • -qarch=pwr6 • -qarch=pwr6e • -qtune=pwr6 The -qipa compiler option also adds a new architecture cloning suboption, -qipa=clonearch=pwr6, to support interprocedural analysis optimizations on POWER6 processors. Support removed for selected processors: XL C V9.0 removes support for processor architectures not supported by AIX 5L V5.2 or later, such as POWER, POWER2™, and PowerPC 601®. As a result, the following -qarch and -qtune suboption settings are no longer supported: -qarch=com | pwr | pwr2 | pwr2s | p2sc |601 |602 |603 -qtune=pwr | pwr2 | pwr2s | pwrx | p2sc |601 |602 |603 Additional enhancements • XL C V9.0 introduces many new performance-related compiler options and directives. • New built-in functions for this release include PowerPC cache control and POWER6 prefetch extensions and cache control. Accessibility by people with disabilities You can request a U.S. Section 508 Voluntary Product Accessibility Template (VPAT) with details on accessibility compliance at http://www-3.ibm.com/able/product_accessibility/index.html Product positioning XL C Enterprise Edition V9.0 for AIX is part of the IBM family of C and C++ compilers that support a number of platforms. It joins XL C/C++ Enterprise Edition for AIX on the System p, XL C/C++ Advanced Edition for Linux on System i and System p, XL C/C++ for z/OS, ILE C/C++ for OS/400® on System i, and C/C++ for z/VM. The code base for all of these compilers (C and C++) is the same. This will facilitate source-level portability of your applications from these platforms to AIX. In addition, the C compiler supports the latest ISO C 1999 (International Standard ISO/IEC 9899:1999) standard. With XL C V9.0, the default -qlanglvl compiler option is now extc99 when invoking the C compiler with the xlc invocation. You can now more easily use C99 features and headers without having to explicitly specify the extc99 option. With representation from the IBM compiler development team on the ISO/ANSI C committee, IBM is in a position to understand the latest updates, clarifications, and recommendations to the C standards. Support of programming language standards allows for portability of your source code among a variety of compiler implementations. Trade-marks IBM Canada Ltd. Announcement A07-1516 IBM is a registered trademark of International Business Machines Corporation 3 POWER6, System p, POWER3, POWER4, POWER5, System p5, System i, i5/OS, POWER, AIX 5L, and POWER2 are trade-marks of International Business Machines Corporation used under license by IBM Canada Ltd. AIX, PowerPC, z/OS, Blue Gene, z/VM, BladeCenter, PowerPC 601, and OS/400 are registered trade-marks of International Business Machines Corporation used under license by IBM Canada Ltd. Linux is a trade-mark of Linus Torvalds in the United States, other countries or both. Other company, product, and service names may be trade-marks or service marks of others. This announcement is provided for your information only. For additional information, contact your IBM representative, call 800-IBM-4YOU, or visit the IBM home page at: http://www.ibm.com/ca/ IBM Canada Ltd. Announcement A07-1516 IBM is a registered trademark of International Business Machines Corporation 4.
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