 IBM's two new Blue Gene products, XL C/C++ Advanced Edition for Blue Gene/L, V9.0 and XL C/C++ Advanced Edition for Blue Gene/P, V9.0 include all of the common XL C/C++ compiler features described on the XL C/C++ Features and benefits page, plus the following:
Optimization and performance
XL C/C++ offers a number of optimization and performance-tuning features that exploit all PowerPC systems. The -qarch and -qtune compiler options further tune generated application code to fully exploit the performance capabilities of the PowerPC 440d processor and its Double Hummer floating-point unit used in Blue Gene/L systems, and the PowerPC 450d processor and its Double Hummer floating-point unit used in Blue Gene/P systems. In addition, both compilers provide a versatile set of built-in functions capable of manipulating complex data types, and you can include calls to these built-in functions in your program code to further exploit the capabilities of the PowerPC 440, 440d, 450, and 450d processors. Mathematical Acceleration Subsystem (MASS)
XL C/C++ provides additional scalar and vector functions as part of the Mathematical Acceleration Subsystem (MASS). MASS consists of libraries of tuned mathematical intrinsic functions that offer improved performance over the standard mathematical library routines. Basic Linear Algebra Subprograms (BLAS)
XL C/C++ includes the Basic Linear Algebra Subprograms (BLAS) set of high-performance algebraic functions. You can use these functions to perform combined matrix multiplication and addition on general matrices or their transposes. | 
