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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/108498] [11/12/13 Regression] ppc64 big endian generates uninitialized reads with -fstore-merging
Date: Tue, 24 Jan 2023 17:10:11 +0000	[thread overview]
Message-ID: <bug-108498-4-sEOzKg3TuY@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-108498-4@http.gcc.gnu.org/bugzilla/>

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108498

--- Comment #22 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
The C/C++ FEs since r9-6625-gbec1da64aec26a490 turn some array initializers
into strings.

Anyway, I wonder if for GCC 14 we couldn't just treat STRING_CST the same as
INTEGER_CST during the merging into groups and instead deal with all of that
during split_group.
I.e. only at that time see that for this subset of stores we want to merge them
into one STRING_CST store, these others handle differently, etc.  And the
preconditions for handling something the STRING_CST way would be contiguous
chunk with byte aligned start/end containg at least one longer STRING_CST.  So,
we wouldn't give up e.g. in
the second testcase, but merge the STRING_CSTs stores with the 4 byte
INTEGER_CST store in between them, while handling the bitfield stuff at the
start and/or the end to separate stores.

  parent reply	other threads:[~2023-01-24 17:10 UTC|newest]

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-01-23 14:18 [Bug c/108498] New: " kungfujesus06 at gmail dot com
2023-01-23 15:18 ` [Bug c/108498] " kungfujesus06 at gmail dot com
2023-01-23 15:20 ` [Bug middle-end/108498] " pinskia at gcc dot gnu.org
2023-01-23 15:22 ` kungfujesus06 at gmail dot com
2023-01-23 15:34 ` kungfujesus06 at gmail dot com
2023-01-23 15:38 ` rguenth at gcc dot gnu.org
2023-01-23 15:48 ` kungfujesus06 at gmail dot com
2023-01-23 15:51 ` kungfujesus06 at gmail dot com
2023-01-23 15:54 ` kungfujesus06 at gmail dot com
2023-01-23 17:39 ` pinskia at gcc dot gnu.org
2023-01-23 17:40 ` pinskia at gcc dot gnu.org
2023-01-23 17:42 ` kungfujesus06 at gmail dot com
2023-01-23 17:45 ` pinskia at gcc dot gnu.org
2023-01-23 17:51 ` [Bug tree-optimization/108498] " pinskia at gcc dot gnu.org
2023-01-23 17:51 ` kungfujesus06 at gmail dot com
2023-01-23 18:18 ` kungfujesus06 at gmail dot com
2023-01-23 19:04 ` jakub at gcc dot gnu.org
2023-01-24 12:20 ` [Bug tree-optimization/108498] [11/12/13 Regression] " jakub at gcc dot gnu.org
2023-01-24 12:55 ` jakub at gcc dot gnu.org
2023-01-24 15:35 ` jakub at gcc dot gnu.org
2023-01-24 16:09 ` jakub at gcc dot gnu.org
2023-01-24 16:48 ` ebotcazou at gcc dot gnu.org
2023-01-24 17:10 ` jakub at gcc dot gnu.org [this message]
2023-01-24 17:33 ` ebotcazou at gcc dot gnu.org
2023-01-24 17:46 ` jakub at gcc dot gnu.org
2023-01-25  9:51 ` cvs-commit at gcc dot gnu.org
2023-01-25 10:35 ` [Bug tree-optimization/108498] [11/12 " jakub at gcc dot gnu.org
2023-02-10 17:46 ` cvs-commit at gcc dot gnu.org
2023-02-10 18:00 ` [Bug tree-optimization/108498] [11 " jakub at gcc dot gnu.org
2023-05-02 20:13 ` cvs-commit at gcc dot gnu.org
2023-05-03 10:35 ` jakub at gcc dot gnu.org

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