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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/57343] [4.8/4.9 Regression] wrong code on x86_64-linux at -Os and above
Date: Tue, 21 May 2013 12:19:00 -0000 [thread overview]
Message-ID: <bug-57343-4-6Kw2EkBUbn@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-57343-4@http.gcc.gnu.org/bugzilla/>
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.
next prev parent reply other threads:[~2013-05-21 12:19 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <bug-57343-4@http.gcc.gnu.org/bugzilla/>
2013-05-20 22:55 ` [Bug tree-optimization/57343] " glisse at gcc dot gnu.org
2013-05-21 6:23 ` [Bug tree-optimization/57343] [4.8/4.9 Regression] " jakub at gcc dot gnu.org
2013-05-21 9:54 ` rguenth at gcc dot gnu.org
2013-05-21 11:54 ` rguenth at gcc dot gnu.org
2013-05-21 12:19 ` rguenth at gcc dot gnu.org [this message]
2013-05-21 14:41 ` rakdver at gcc dot gnu.org
2013-05-27 7:55 ` rguenther at suse dot de
2013-05-27 9:01 ` rguenth at gcc dot gnu.org
2013-05-27 13:03 ` [Bug tree-optimization/57343] [4.8 " rguenth at gcc dot gnu.org
2013-08-29 13:09 ` jakub at gcc dot gnu.org
2013-08-29 13:17 ` jakub at gcc dot gnu.org
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