search for: codelets

...al performance. Autotuning substantially improves default parameters in many scenarios but it is a costly process requiring a long iterative evaluation. We propose an automatic piecewise autotuner based on CERE (Codelet Extractor and REplayer). CERE decomposes applications into small pieces called codelets: each codelet maps to a loop or to an OpenMP parallel region and can be replayed as a standalone program. Codelet autotuning achieves better speedups at a lower tuning cost. By grouping codelet invocations with the same performance behavior, CERE reduces the number of loops or OpenMP regions to be...

...ng > substantially improves default parameters in many scenarios > but it is a costly process requiring a long iterative evaluation. > We propose an automatic piecewise autotuner based on CERE (Codelet > Extractor and REplayer). CERE decomposes applications into small > pieces called codelets: each codelet maps to a loop or to an OpenMP > parallel region and can be replayed as a standalone program. > Codelet autotuning achieves better speedups at a lower tuning cost. By > grouping codelet invocations with the same performance behavior, CERE > reduces the number of loops or O...

Hello, We have published two papers which build upon the LLVM Compiler Infrastructure. Would it be possible to include them in the LLVM related publications at http://llvm.org/pubs/ ? I attach below the bibliographic references: "CERE: LLVM Based Codelet Extractor and REplayer for Piecewise Benchmarking and Optimization" P. de Oliveira Castro, C. Akel, E. Petit, M. Popov, and W.

...aliasing). I tried that this evening (see attached mdct.[ch]), but it's only about 30% faster than the Vorbis MDCT for 2048 samples, although the advantage increases for larger sizes (e.g. 60% faster for 128k samples). It could be made substantially more efficient by generating special purpose codelets to avoid separate pre/post-processing passes...we know our DCT-IV code is not optimal. (It also doesn't use SIMD.) The above two codes compute an unwindowed MDCT, and give the same results as the one in your mdct.c, but I can also easily make one with a window function built in (to avoid the...

...nd might provide a faster LAPACK library for the open source world. FFTW is another hugely important numerical library that could be used for benchmarking. Aside from simply getting FFTW to work using llvm-gcc, an interesting project might be to rewrite the OCaml source code in FFTW to generate codelets on-the-fly using LLVM or the CLang front-end. LLVM can probably beat GCC here, not least because an LLVM-based implementation would not be limited to a set of precompiled codelets. This could help the millions of people who use FFTW. On an unrelated note, LLVM has great potential for improving...

Hello, Everyone LLVM recently was approved to take part in Google Summer of Code 2008. We welcome everyone to apply for this program. The list of ideas for (possible) projects is located at http://llvm.org/OpenProjects.html. Surely you can suggest any other project, if you feel, that it definitely can be useful. Our common requirement for student is to submit proposal to LLVM Developers