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From: "irar at il dot ibm dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/32377] can't determine dependence (source/destination overlap without more than size)
Date: Tue, 03 Jul 2007 12:57:00 -0000 [thread overview]
Message-ID: <20070703125732.24550.qmail@sourceware.org> (raw)
In-Reply-To: <bug-32377-33@http.gcc.gnu.org/bugzilla/>
------- Comment #7 from irar at il dot ibm dot com 2007-07-03 12:57 -------
(In reply to comment #6)
> Distance vectors are lexicographically positive vectors, that is why you get
> the 1
> in all these cases. If you want to know which one comes first, you have to
> look
> at the DR_IS_READ for both references in the dependence relation.
I am sorry, but I still don't understand.
For
for (i = 0; i < N; i++){
ia[i+1] = ia[i] * 4;
}
the ddr is {ld, st} and distance 1
and for
for (i = 0; i < N; i++){
ia[i] = ia[i+1] * 4;
}
the ddr is also {ld, st} with distance 1.
How can we distinguish between these cases?
Thanks,
Ira
--
irar at il dot ibm dot com changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |irar at il dot ibm dot com
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32377
next prev parent reply other threads:[~2007-07-03 12:57 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-06-17 15:26 [Bug fortran/32377] New: can't determine dependence (source/destination overlap) tprince at computer dot org
2007-06-17 15:26 ` [Bug fortran/32377] " tprince at computer dot org
2007-06-18 1:37 ` tprince at computer dot org
2007-06-18 2:45 ` [Bug tree-optimization/32377] can't determine dependence (source/destination overlap without more than size) pinskia at gcc dot gnu dot org
2007-07-01 12:48 ` dorit at gcc dot gnu dot org
2007-07-02 12:20 ` irar at il dot ibm dot com
2007-07-03 7:14 ` spop at gcc dot gnu dot org
2007-07-03 12:57 ` irar at il dot ibm dot com [this message]
2007-07-03 13:57 ` sebpop at gmail dot com
2007-07-03 16:44 ` irar at il dot ibm dot com
2007-07-04 7:21 ` sebpop at gmail dot com
2007-07-04 8:35 ` irar at il dot ibm dot com
2007-07-08 10:00 ` irar at il dot ibm dot com
2007-07-08 10:01 ` irar at il dot ibm dot com
2007-07-09 14:19 ` sebpop at gmail dot com
2007-10-31 1:14 ` sebpop at gmail dot com
2007-10-31 13:53 ` spop at gcc dot gnu dot org
2007-10-31 13:54 ` spop at gcc dot gnu dot org
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