XL C for AIX

Advanced compilation and optimization technologies designed for AIX and Power Systems

IBM XL C for AIX is a compiler that helps you create and maintain applications written in C for IBM Power Systems™. XL C for AIX supports vector and parallel programming for multiprocessor systems, while maintaining a full binary compatibility with existing single processor systems. This compiler complies with the latest international programming language standards providing support for code portability between multiple operating systems and hardware platforms.

  • Performance tuning: Optimizes and maximizes the application performance executing on Power Systems.
  • Math libraries and utilities: Provides highly-tuned math libraries and optimization and development utilities.
  • Standards compliance: Conforms to the latest ISO C 1999 standards enabling ease of application migration to Power Systems.
  • Integration: Integrates with IBM Rational® Developer for Power and IBM Rational Team Concert™ for Power.
  • Reporting: Generates reports that indicate the number of concurrent users using the compiler.

Performance tuning

  • XL C for AIX offers automatic parallelization of sequential programs to leverage modern multicore processors. This compiler provides a complete implementation of OpenMP 3.0 to hide the complexities of parallel programming.
  • XL C for AIX provides language extensions to support Vector Multimedia eXtension (VMX) and Vector Scalar eXtension (VSX) programming.
  • XL C for AIX produces monitoring code used to generate a runtime profile to help tune the performance of applications.
  • Profile directed feedback (PDF) optimization collects information about a program run with typical input data and then applies transformations to the program based on that information. PDF can ensure the performance of the application is optimized for its important inputs.

Math libraries and utilities

  • Mathematical Acceleration Subsystem (MASS) consists of libraries of mathematical intrinsic functions tuned specifically for optimum performance on Power Architecture.
  • Basic Linear Algebra Subprograms (BLAS) provides high-performance, algebraic functions used to perform combined matrix multiplication and addition on general matrices or their transposes.
  • Shared memory parallelization (SMP) runtime library supports both explicit and automatic parallel processing.

Standards compliance

  • XL C conforms to the C99 and C89 programming language specifications for C.
  • This compiler implements language extensions to support VMX and VSX vector programming.

XL C for AIX resources

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Advanced compilation and optimization technologies designed for AIX and Power Systems

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System requirements

XL C for AIX, V12.1 can be obtained as a separate orderable product, or as an included component of XL C/C++ for AIX, V12.1

XL C for AIX, V12.1


Operating SystemSoftwareHardware
AIX AIX 5.3 TL 5300-07 (or later), AIX 6.1, or AIX 7.1, or IBM PASE for i 6.1 (with PTF SI30636 or later), or IBM PASE for i 7.1 IBM Power System servers supporting the IBM Power Architecture

500 MB disk space

XL C for AIX, V11.1


Operating SystemSoftwareHardware
AIX AIX 5.3 TL 5300-07 (or later), AIX 6.1, AIX 7.1 or IBM PASE for i 6.1 (with PTF SI30636 or later) IBM Power System servers supporting the IBM Power Architecture

430 MB disk space

XL C for AIX, V10.1


Operating SystemSoftwareHardware
AIX AIX 5.3 TL 5300-06 (or higher), AIX 6.1, AIX 7.1 or IBM i V6.1 PASE IBM Power System servers supporting the IBM Power Architecture

430 MB disk space

All versions


Operating SystemSoftwareHardware
AIX Frames-capable browser to view HTML-based online documentation

PDF viewer to view PDF documentation

Graphical desktop environment such as K Desktop Environment (KDE)		 Note: High levels of optimization can require more space for paging and temporary files

Application Lifecycle Management

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XL C for AIX

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