diff options
Diffstat (limited to 'gcc/tree-ssa-loop-niter.c')
| -rw-r--r-- | gcc/tree-ssa-loop-niter.c | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/gcc/tree-ssa-loop-niter.c b/gcc/tree-ssa-loop-niter.c index d3007d7..a9b7077 100644 --- a/gcc/tree-ssa-loop-niter.c +++ b/gcc/tree-ssa-loop-niter.c @@ -3011,7 +3011,12 @@ discover_iteration_bound_by_body_walk (struct loop *loop) /* Exit terminates loop at given iteration, while non-exits produce undefined effect on the next iteration. */ if (!elt->is_exit) - bound += double_int_one; + { + bound += double_int_one; + /* If an overflow occurred, ignore the result. */ + if (bound.is_zero ()) + continue; + } if (!loop->any_upper_bound || bound.ult (loop->nb_iterations_upper_bound)) @@ -3037,7 +3042,12 @@ discover_iteration_bound_by_body_walk (struct loop *loop) { double_int bound = elt->bound; if (!elt->is_exit) - bound += double_int_one; + { + bound += double_int_one; + /* If an overflow occurred, ignore the result. */ + if (bound.is_zero ()) + continue; + } if (!loop->any_upper_bound || bound.ult (loop->nb_iterations_upper_bound)) |