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GCC Vectorization

This post categorized under Vector and posted on July 9th, 2018.

Vectorization of loops that operate on multiple data-types including type conversions submitted for incorporation into GCC 4.2. Detection and vectorization of special idioms such as dot-product and widening-summation Incorporated into GCC 4.2.Good because vectorization is an optimization and we didnt tell gcc we wanted to optimize our program. Vectorization is turned on by default on -O3 but that also triggers a bunch of other optimizations we dont want right now. Instead we can use -O2 -ftree-vectorize. Just as a sanity check you could compile with -O0 and -O2 for such a simple snippet there shouldnt be any major Auto-vectorization with gcc 4.7 One way of speeding up code which contains many loops is to use vectorization. On modern machines this means the use of SSE or AVX instructions.

I would like GCC to vectorize the below code.-fopt-info tells me that GCC is not currently. I believe the problem is the strided access of W or possible the backward incrementing of k . Note that height and width are constants and index_type is set to unsigned long currently.Tour Start here for a quick overview of the site Help Center Detailed answers to any questions you might have

GCC Vectorization: Gnu Improvements In Auto Vectorization And Math Routines

Gnu Improvements In Auto Vectorization And Math Routines

PGI compilers deliver the performance you need on CPUs with OpenACC and CUDA Fortran for HPC applications development on GPU-accelerated systems.In [more]

GCC Vectorization: Arm Cortex A Processors And Gcc Command Lines

Arm Cortex A Processors And Gcc Command Lines

GCC 7 Release Series Changes New Features and Fixes. This page is a brief summary of some of the huge number of improvements in GCC 7. For more inf [more]

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