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From: "anlauf at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug fortran/86277] Presence of optional arguments not recognized for zero length arrays Date: Mon, 12 Jun 2023 20:32:20 +0000 [thread overview] Message-ID: <bug-86277-4-y230VjTQzw@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-86277-4@http.gcc.gnu.org/bugzilla/> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86277 --- Comment #29 from anlauf at gcc dot gnu.org --- (In reply to Mikael Morin from comment #28) > (In reply to anlauf from comment #27) > > (In reply to Mikael Morin from comment #25) > > > (In reply to Mikael Morin from comment #24) > > > > (In reply to Mikael Morin from comment #23) > > > > > > > > > > This regresses on pr108065.f90 (that's a few extra analyzer warnings), > > > > > and on pr69955.f90 (that's one extra __builtin_malloc). > > > > > > > > This removes the regressions. Not fully retested again. > > > > > > > Comment #23 is probably the more correct one. > > > Comment #24 works because of the double temporary. Even if the first > > > temporary has NULL data component, the second one uses malloc > > > unconditionally to set data, and the argument is seen as present. > > > > Are you sure that you haven't mixed up those two? > > > > When trying with my extended testcase, and looking at the tree dump, > > I see a double temporary for the call > > > > call i ([real:: y]) > > > > where the data pointer to the first allocation is clobbered later. > > So I would rather go with the version from comment #24. > > > Let's rephrase: > When (or rather if) we manage to remove the double temporary, we'll regress > with comment #24, not with comment #23. > The reallocation remains by the way, it's only pushed one step away. > Try this for example: > > call i([real:: y, y]) I do see the reallocation, but in the case of the patch in #24 it is a realloc of a NULL, which is well-defined nowadays. But I do not see a regression. On the contrary, every else seems unchanged. > > > If you don't object, I'll package the patch with testcases and submit. > > No problem, I think we are safe with the second temporary. Besides the issue with one or two temporaries, is there anything else?
next prev parent reply other threads:[~2023-06-12 20:32 UTC|newest] Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top [not found] <bug-86277-4@http.gcc.gnu.org/bugzilla/> 2020-03-12 11:58 ` jakub at gcc dot gnu.org 2021-06-01 8:11 ` rguenth at gcc dot gnu.org 2022-05-27 8:19 ` rguenth at gcc dot gnu.org 2023-06-09 19:48 ` anlauf at gcc dot gnu.org 2023-06-09 19:48 ` anlauf at gcc dot gnu.org 2023-06-10 10:27 ` mikael at gcc dot gnu.org 2023-06-10 10:30 ` mikael at gcc dot gnu.org 2023-06-10 10:40 ` mikael at gcc dot gnu.org 2023-06-10 11:45 ` mikael at gcc dot gnu.org 2023-06-10 13:21 ` anlauf at gcc dot gnu.org 2023-06-10 13:25 ` anlauf at gcc dot gnu.org 2023-06-10 19:27 ` anlauf at gcc dot gnu.org 2023-06-10 19:55 ` mikael at gcc dot gnu.org 2023-06-10 20:07 ` mikael at gcc dot gnu.org 2023-06-10 20:17 ` mikael at gcc dot gnu.org 2023-06-10 20:33 ` mikael at gcc dot gnu.org 2023-06-11 20:44 ` anlauf at gcc dot gnu.org 2023-06-12 7:13 ` mikael at gcc dot gnu.org 2023-06-12 7:39 ` mikael at gcc dot gnu.org 2023-06-12 7:56 ` mikael at gcc dot gnu.org 2023-06-12 8:17 ` mikael at gcc dot gnu.org 2023-06-12 10:38 ` mikael at gcc dot gnu.org 2023-06-12 19:42 ` anlauf at gcc dot gnu.org 2023-06-12 19:47 ` anlauf at gcc dot gnu.org 2023-06-12 20:16 ` mikael at gcc dot gnu.org 2023-06-12 20:32 ` anlauf at gcc dot gnu.org [this message] 2023-06-12 20:51 ` mikael at gcc dot gnu.org 2023-06-12 21:00 ` anlauf at gcc dot gnu.org 2023-06-12 21:14 ` anlauf at gcc dot gnu.org 2023-06-13 18:09 ` cvs-commit at gcc dot gnu.org 2023-06-13 19:30 ` anlauf at gcc dot gnu.org 2023-06-29 19:50 ` cvs-commit at gcc dot gnu.org 2023-06-29 19:53 ` anlauf at gcc dot gnu.org
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