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From: "tkoenig at netcologne dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/44773] [4.6 Regression] Unnecessary temporaries increase the runtime for channel.f90 by ~70%
Date: Thu, 08 Jul 2010 19:56:00 -0000 [thread overview]
Message-ID: <20100708195549.24197.qmail@sourceware.org> (raw)
In-Reply-To: <bug-44773-12313@http.gcc.gnu.org/bugzilla/>
------- Comment #13 from tkoenig at netcologne dot de 2010-07-08 19:55 -------
Subject: Re: [4.6 Regression] Unnecessary temporaries
increase the runtime for channel.f90 by ~70%
Hello Paul,
> That is the context - apply it and see.
What about
module baz
implicit none
contains
subroutine bar(x)
real, dimension(:,:,:) :: x
x = 3.0
end subroutine bar
end module baz
program sw
use baz
implicit none
integer, parameter :: n = 4, m = 7, k = 5
real ,dimension(M,N):: f,dudx,dvdy,dhdx,dhdy
real, dimension(m,n,k) :: u
u = 1.0
dudx = ddx(u(:,:,2))
print *,dudx
contains
real function ddx(array)
real, dimension(:,:) :: array
call bar(u)
ddx = array(1,1)
end function ddx
end program sw
AFAICS, this is legal and would require a temporary.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44773
next prev parent reply other threads:[~2010-07-08 19:56 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-07-01 21:22 [Bug fortran/44773] New: " dominiq at lps dot ens dot fr
2010-07-02 7:31 ` [Bug fortran/44773] " burnus at gcc dot gnu dot org
2010-07-02 8:19 ` dominiq at lps dot ens dot fr
2010-07-02 8:46 ` mikael at gcc dot gnu dot org
2010-07-02 8:51 ` dominiq at lps dot ens dot fr
2010-07-02 15:25 ` jvdelisle at gcc dot gnu dot org
2010-07-02 16:53 ` dominiq at lps dot ens dot fr
2010-07-03 9:37 ` tkoenig at gcc dot gnu dot org
2010-07-03 17:03 ` tkoenig at gcc dot gnu dot org
2010-07-04 10:49 ` dominiq at lps dot ens dot fr
2010-07-08 11:41 ` ubizjak at gmail dot com
2010-07-08 12:30 ` pault at gcc dot gnu dot org
2010-07-08 13:33 ` burnus at gcc dot gnu dot org
2010-07-08 15:33 ` paul dot richard dot thomas at gmail dot com
2010-07-08 19:56 ` tkoenig at netcologne dot de [this message]
2010-07-08 19:57 ` burnus at gcc dot gnu dot org
2010-07-09 12:02 ` dominiq at lps dot ens dot fr
2010-07-09 12:27 ` burnus at gcc dot gnu dot org
2010-07-10 14:57 ` pault at gcc dot gnu dot org
2010-07-10 17:09 ` pault at gcc dot gnu dot org
2010-07-11 16:07 ` pault at gcc dot gnu dot org
2010-07-12 6:31 ` paul dot richard dot thomas at gmail dot com
2010-07-12 7:26 ` steven at gcc dot gnu dot org
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