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From: Harald Anlauf <anlauf@gmx.de>
To: Mikael Morin <morin-mikael@orange.fr>,
	Thomas Koenig <tkoenig@netcologne.de>,
	Richard Biener <richard.guenther@gmail.com>
Cc: Mikael Morin <mikael@gcc.gnu.org>,
	gcc-patches@gcc.gnu.org, fortran@gcc.gnu.org
Subject: Re: [PATCH 09/10] fortran: Support clobbering of variable subreferences [PR88364]
Date: Mon, 19 Sep 2022 21:46:47 +0200	[thread overview]
Message-ID: <6ac60050-2298-df01-1345-d53c868ed5d9@gmx.de> (raw)
In-Reply-To: <9996bd59-9cf1-12df-faa5-7d546e5732f7@orange.fr>

Am 18.09.22 um 22:55 schrieb Mikael Morin:
> Le 18/09/2022 à 20:32, Harald Anlauf a écrit :
>>
>> Assumed shape will be on the easy side,
>> while assumed size likely needs to be excluded for clobbering.
>>
> Isn’t it the converse that is true?
> Assumed shape can be non-contiguous so have to be excluded, but assumed
> size are contiguous, so valid candidates for clobbering. No?

I really was referring here to *dummies*, as in the following example:

program p
   integer :: a(4)
   a = 1
   call sub (a(1), 2)
   print *, a
contains
   subroutine sub (b, k)
     integer, intent(in)  :: k
     integer, intent(out) :: b(*)
!   integer, intent(out) :: b(k)
     if (k > 2) b(k) = k
   end subroutine sub
end program p

Assumed size (*) is just a contiguous hunk of memory of possibly
unknown size, which can be zero.  So you couldn't set a clobber
for the a(1) actual argument.

> No way, really, arrays are going to be a maze of complexity.

Agreed.



  parent reply	other threads:[~2022-09-19 19:46 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-09-16 20:24 [PATCH 00/10] fortran: clobber fixes [PR41453] Mikael Morin
2022-09-16 20:24 ` [PATCH 01/10] fortran: Move the clobber generation code Mikael Morin
2022-09-16 20:24 ` [PATCH 02/10] fortran: Fix invalid function decl clobber ICE [PR105012] Mikael Morin
2022-09-16 20:24 ` [PATCH 03/10] fortran: Move clobbers after evaluation of all arguments [PR106817] Mikael Morin
2022-09-16 20:24 ` [PATCH 04/10] fortran: Support clobbering with implicit interfaces [PR105012] Mikael Morin
2022-09-16 20:24 ` [PATCH 05/10] fortran: Support clobbering of reference variables [PR41453] Mikael Morin
2022-09-16 20:24 ` [PATCH 06/10] fortran: Support clobbering of SAVE variables [PR87395] Mikael Morin
2022-09-16 20:24 ` [PATCH 07/10] fortran: Support clobbering of ASSOCIATE variables [PR87397] Mikael Morin
2022-09-16 20:24 ` [PATCH 08/10] fortran: Support clobbering of allocatables and pointers [PR41453] Mikael Morin
2022-09-16 20:24 ` [PATCH 09/10] fortran: Support clobbering of variable subreferences [PR88364] Mikael Morin
2022-09-17 17:03   ` Thomas Koenig
2022-09-17 19:33     ` Mikael Morin
2022-09-17 19:49       ` Bernhard Reutner-Fischer
2022-09-17 19:50       ` Mikael Morin
2022-09-17 21:24         ` Bernhard Reutner-Fischer
2022-09-18  6:12       ` Richard Biener
2022-09-18  9:10         ` Mikael Morin
2022-09-18 10:23           ` Thomas Koenig
2022-09-18 18:32             ` Harald Anlauf
2022-09-18 20:55               ` Mikael Morin
2022-09-19  7:11                 ` Mikael Morin
2022-09-19 19:46                 ` Harald Anlauf [this message]
2022-09-19 20:50                   ` Mikael Morin
2022-09-20  6:54                     ` Thomas Koenig
2022-09-20  8:46                       ` Mikael Morin
2022-09-20 21:08                     ` Harald Anlauf
2022-09-20 21:08                       ` Harald Anlauf
2022-09-21  9:57                       ` Thomas Koenig
2022-09-21 18:56                         ` Mikael Morin
2022-09-21 19:12                           ` Harald Anlauf
2022-09-21 19:12                             ` Harald Anlauf
2022-09-18 20:43             ` Mikael Morin
2022-09-18 10:48           ` Richard Biener
2022-09-19  7:31             ` Mikael Morin
2022-09-19  7:58               ` Richard Biener
2022-09-16 20:24 ` [PATCH 10/10] fortran: Support clobbering of derived types [PR41453] Mikael Morin

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