http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57343
--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #4)
> Index: gcc/tree-ssa-loop-niter.c
> ===================================================================
> --- gcc/tree-ssa-loop-niter.c (revision 199137)
> +++ gcc/tree-ssa-loop-niter.c (working copy)
> @@ -627,7 +627,7 @@ number_of_iterations_ne (tree type, affi
> not overflow, BNDS bounds the value of C. Also, this is the
> case if the computation |FINAL - IV->base| does not overflow, i.e.,
> if BNDS->below in the result is nonnegative. */
> - if (tree_int_cst_sign_bit (iv->step))
> + if (tree_int_cst_sgn (iv->step) == -1)
> {
> s = fold_convert (niter_type,
> fold_build1 (NEGATE_EXPR, type, iv->step));
>
> fixes the testcase (otherwise untested).
Doesn't work and fails bootstrap.
