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From: "tkoenig at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/36928] array temporary for interleaving assignment
Date: Sat, 22 May 2010 10:11:00 -0000 [thread overview]
Message-ID: <20100522101112.26544.qmail@sourceware.org> (raw)
In-Reply-To: <bug-36928-10391@http.gcc.gnu.org/bugzilla/>
------- Comment #10 from tkoenig at gcc dot gnu dot org 2010-05-22 10:11 -------
I've gotten a bit further with this.
For x(la:ua:sa) = x(lb,ub,sb), there can be no collision
if abs(la-lb) mod gcd(sa, sb) == 0
where gcd is the greatest common divisor.
This will at least fix the test case from comment #1, and also cases like
a(2:x:2) = a(1:y:4).
but will not work in the cases where there is partial overlap only.
Also, it would be nice to have complete simplification so that cases like
a(2*n**2+3*n+1:x:2) = a(2*n**2+3*n:x:2)
can be caught.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36928
next prev parent reply other threads:[~2010-05-22 10:11 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-07-25 6:55 [Bug fortran/36928] New: " tkoenig at gcc dot gnu dot org
2008-07-25 8:43 ` [Bug fortran/36928] " burnus at gcc dot gnu dot org
2008-11-14 8:27 ` jv244 at cam dot ac dot uk
2010-05-09 20:28 ` dfranke at gcc dot gnu dot org
2010-05-15 15:56 ` tkoenig at gcc dot gnu dot org
2010-05-15 17:06 ` dominiq at lps dot ens dot fr
2010-05-15 17:30 ` tkoenig at gcc dot gnu dot org
2010-05-15 18:01 ` dominiq at lps dot ens dot fr
2010-05-15 18:13 ` jvdelisle at gcc dot gnu dot org
2010-05-16 9:00 ` tkoenig at gcc dot gnu dot org
2010-05-16 10:31 ` rguenth at gcc dot gnu dot org
2010-05-22 10:11 ` tkoenig at gcc dot gnu dot org [this message]
2010-05-22 10:51 ` dominiq at lps dot ens dot fr
2010-05-22 21:20 ` tkoenig at gcc dot gnu dot org
2010-05-31 20:22 ` tkoenig at gcc dot gnu dot org
2010-06-01 5:30 ` [Bug fortran/36928] array temporary for interleaving assignment with non-constant start values tkoenig at gcc dot gnu dot org
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