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Polyhedral-based Loop Optimizations and Dependence Analysis Part 1
Polyhedral model is a linear algebraic model to represent, reason about, and transform loop nests that perform a significant amount of computation on large arrays. These types of loop nests are typically found in High-Performance Computing applications. The model can make it possible for the XLC compiler to generate more efficient code for parts of programs that contain "affine" (or linear) accesses such as a[i][j][k] or a[i+j][i-j][2*k], where a is an array and i, j, and k are loop induction variables. Using the option -qhot=level=1... [More]
Tags: xlc polyhedral loop hpc xlf |
XLC bug with simple floating point calculation ?! Notes for porting floating point application from GCC to XLC/XLF
Good new! The more focused community about XL compilers on POWER is now available at http://ibm.biz/xl-power-compilers . If you are interested in the XL compilers on POWER, you may want to join the new community and subscribe to updates there. See you there! This site remains the Cafe for C/C++ compilers for IBM Z. Hey, when I am porting my code from GCC to XLC, I got some floating point precision error. I spent days to narrow down the issue and seems like there is a potential xlc bug when doing floating point calculation! Can you please... [More]
Tags: point porting xlf -qfloat flaoting -qstrict xlc precision |
