[Bug tree-optimization/48052] loop not vectorized if index is "unsigned int"

[paolo.carlini at oracle dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48052

--- Comment #3 from Paolo Carlini <paolo.carlini at oracle dot com> 2011-03-10 10:22:48 UTC ---
Thanks for the analysis. I knew about the difference between signed and
unsigned, makes sense. Not knowing in detail the internals of the optimization
the puzzling bit is that types wider than unsigned int already work fine. The
problem seems fixable, somehow ;)