diff options
Diffstat (limited to 'gcc/tree-ssa-loop-niter.c')
| -rw-r--r-- | gcc/tree-ssa-loop-niter.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/gcc/tree-ssa-loop-niter.c b/gcc/tree-ssa-loop-niter.c index 40f8e4525aa..73424ee098a 100644 --- a/gcc/tree-ssa-loop-niter.c +++ b/gcc/tree-ssa-loop-niter.c @@ -1348,6 +1348,15 @@ estimate_numbers_of_iterations_loop (struct loop *loop) unsigned i, n_exits; struct tree_niter_desc niter_desc; + /* Give up if we already have tried to compute an estimation. */ + if (loop->estimated_nb_iterations == chrec_dont_know + /* Or when we already have an estimation. */ + || (loop->estimated_nb_iterations != NULL_TREE + && TREE_CODE (loop->estimated_nb_iterations) == INTEGER_CST)) + return; + else + loop->estimated_nb_iterations = chrec_dont_know; + exits = get_loop_exit_edges (loop, &n_exits); for (i = 0; i < n_exits; i++) { @@ -1368,7 +1377,7 @@ estimate_numbers_of_iterations_loop (struct loop *loop) free (exits); /* Analyzes the bounds of arrays accessed in the loop. */ - if (loop->estimated_nb_iterations == NULL_TREE) + if (chrec_contains_undetermined (loop->estimated_nb_iterations)) { varray_type datarefs; VARRAY_GENERIC_PTR_INIT (datarefs, 3, "datarefs"); @@ -1581,6 +1590,7 @@ convert_step_widening (struct loop *loop, tree new_type, tree base, tree step, valid_niter = fold_build2 (FLOOR_DIV_EXPR, unsigned_type, delta, step_abs); + estimate_numbers_of_iterations_loop (loop); for (bound = loop->bounds; bound; bound = bound->next) if (proved_non_wrapping_p (at_stmt, bound, new_type, valid_niter)) return step_in_new_type; @@ -1649,6 +1659,7 @@ scev_probably_wraps_p (tree type, tree base, tree step, step_abs = fold_convert (unsigned_type, step_abs); valid_niter = fold_build2 (FLOOR_DIV_EXPR, unsigned_type, delta, step_abs); + estimate_numbers_of_iterations_loop (loop); for (bound = loop->bounds; bound; bound = bound->next) if (proved_non_wrapping_p (at_stmt, bound, type, valid_niter)) return false; |