Ira Rosen wrote:
Here is the link to the vectorizer's documentation:
http://gcc.gnu.org/projects/tree-ssa/vectorization.html
Thanks, but I take what it says there with some grains of salt. Yes,
-O3 implies -ftree-vectorize on x86_64, but I seem to have to specify
the option on other targets. Also, I have not understood the
limitations of -freassociative-math.
Several gcc vectorization test cases currently throw FAIL on certain
targets, but not on others. I don't know if that is a significant issue.
g++-4.3 seems well ahead of other compilers in ability to vectorize STL
iterators:
http://softwarecommunity.intel.com/Wiki/HighPerformanceComputing/688.htm
