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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/65851] ice in set_lattice_value at tree-ssa-cc p.c:535
Date: Thu, 23 Apr 2015 09:11:00 -0000 [thread overview]
Message-ID: <bug-65851-4-6O4FUJIojt@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-65851-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65851
Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |marxin at gcc dot gnu.org
--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Running creduce and isolating culprit commit.
>From gcc-bugs-return-484427-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 23 09:15:10 2015
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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/65855] missing optimization: triangular numbers
Date: Thu, 23 Apr 2015 09:15:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?ide855
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2015-04-23
Assignee|unassigned at gcc dot gnu.org |rguenth at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
For some reason we can't compute the number of iterations of this loop which is
because we have to assume that
(long unsigned int) n_3(D) != 18446744073709551615
and for some reason we couldn't simplify that to true!?
if (!exit_must_be_taken && !POINTER_TYPE_P (type))
{
if (integer_nonzerop (iv0->step))
assumption = fold_build2 (NE_EXPR, boolean_type_node,
iv1->base, TYPE_MAX_VALUE (type));
if we fix that we fail in the following way:
(chrec_apply
(varying_loop = 1
)
(chrec = {1, +, {2, +, 1}_1}_1)
(x = (long unsigned int) n_3(D) + 18446744073709551615)
(res = scev_not_known))
not replacing:
t_4 = PHI <t_5(3)>
because we can't compute the final result expression.
next prev parent reply other threads:[~2015-04-23 9:11 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-04-22 21:10 [Bug c++/65851] New: " dcb314 at hotmail dot com
2015-04-23 9:11 ` marxin at gcc dot gnu.org [this message]
2015-04-23 9:17 ` [Bug c++/65851] " rguenth at gcc dot gnu.org
2015-04-23 9:31 ` rguenth at gcc dot gnu.org
2015-04-23 9:35 ` marxin at gcc dot gnu.org
2015-04-27 15:23 ` trippels at gcc dot gnu.org
2015-04-28 7:27 ` rguenth at gcc dot gnu.org
2015-04-28 7:31 ` rguenth at gcc dot gnu.org
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