Hi, > This patch attemps to estimate the number of iterations of the loop based on > nonwrapping arithmetic in the loop body. > > 2011-05-05 Tom de Vries <t...@codesourcery.com> > > PR target/45098 > * tree-ssa-loop-ivopts.c (struct ivopts_data): Add fields > max_iterations_p and max_iterations. > (is_nonwrap_use, max_loop_iterations, set_max_iterations): New function. > (may_eliminate_iv): Use max_iterations_p and max_iterations. > (tree_ssa_iv_optimize_loop): Use set_max_iterations.
what are the cases this handles better than the existing analysis of maximum numbers of iterations (estimate_numbers_of_iterations)? Would it be possible to add the handling of these cases to estimate_numbers_of_iterations, rather than doing it just for ivopts? Zdenek
