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From: "rguenther at suse dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/36630] [4.3/4.4 Regression] ICE in vect_update_ivs_after_vectorizer
Date: Thu, 26 Jun 2008 12:12:00 -0000 [thread overview]
Message-ID: <20080626121132.7315.qmail@sourceware.org> (raw)
In-Reply-To: <bug-36630-87@http.gcc.gnu.org/bugzilla/>
------- Comment #3 from rguenther at suse dot de 2008-06-26 12:11 -------
Subject: Re: [4.3/4.4 Regression] ICE in
vect_update_ivs_after_vectorizer
On Thu, 26 Jun 2008, irar at il dot ibm dot com wrote:
> ------- Comment #2 from irar at il dot ibm dot com 2008-06-26 11:57 -------
> For access function (short int) {(short unsigned int) i_44, +, 1}_1)
> evolution_part_in_loop_num() returns NULL, which causes the failure.
>
> I tried to peel NOP_EXPRs from POLYNOMIAL_CHRECs in
> evolution_part_in_loop_num(), but it caused lots of testsuite failures, and I
> am not sure this is the correct way.
Well, the problem is that an unsigned induction variable may validly
wrap while a signed induction variable may not. This is probably the
cause of the testsuite failures. Can't you simply handle a NULL return
from evolution_part_in_loop_num in the vectorizer?
Richard.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36630
next prev parent reply other threads:[~2008-06-26 12:12 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-06-25 12:48 [Bug tree-optimization/36630] New: " jakub at gcc dot gnu dot org
2008-06-25 12:48 ` [Bug tree-optimization/36630] " jakub at gcc dot gnu dot org
2008-06-25 14:28 ` rguenth at gcc dot gnu dot org
2008-06-26 11:58 ` irar at il dot ibm dot com
2008-06-26 12:12 ` rguenther at suse dot de [this message]
2008-06-26 18:34 ` irar at il dot ibm dot com
2008-07-10 14:19 ` rguenth at gcc dot gnu dot org
2008-07-16 6:20 ` irar at il dot ibm dot com
2008-07-18 16:53 ` rguenth at gcc dot gnu dot org
2008-08-27 22:13 ` jsm28 at gcc dot gnu dot org
2008-08-28 15:11 ` rguenth at gcc dot gnu dot org
2008-09-03 10:44 ` irar at il dot ibm dot com
2008-09-03 21:04 ` spop at gcc dot gnu dot org
2008-09-07 7:16 ` irar at gcc dot gnu dot org
2008-09-07 10:08 ` irar at gcc dot gnu dot org
2008-09-07 11:06 ` irar at il dot ibm dot com
2008-09-08 7:46 ` irar at il dot ibm dot com
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