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From: "nightstrike at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/101854] [11 Regression] Invalid warning
 -Wstringop-overflow wrong argument
Date: Thu, 22 Dec 2022 02:49:30 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 11.2.0
X-Bugzilla-Keywords: diagnostic
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X-Bugzilla-Who: nightstrike at gmail dot com
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101854

--- Comment #11 from nightstrike <nightstrike at gmail dot com> ---
(In reply to Martin Sebor from comment #9)
> Fixed for GCC 12.  The patch is far too intrusive to backport but the
> following should fix the problem in GCC 11:

Would you mind applying it to 11?  Thanks!

Also, I think in your diff below, there's "// A nonnull" that should be "/*=
 A
nonnull"... / to *

> diff --git a/gcc/calls.c b/gcc/calls.c
> index fcb0d6dec69..f116923c890 100644
> --- a/gcc/calls.c
> +++ b/gcc/calls.c
> @@ -2295,14 +2295,15 @@ initialize_argument_information (int num_actuals
> ATTRIBUTE_UNUSED,
>          operand for later processing.  */
>        if (attr_access *access =3D rdwr_idx.get (argpos))
>         {
> +         int idx =3D i - !!struct_value_addr_value;
>           if (POINTER_TYPE_P (type))
>             {
> -             access->ptr =3D args[i].tree_value;
> +             access->ptr =3D args[idx].tree_value;
>               // A nonnull ACCESS->SIZE contains VLA bounds.  */
>             }
>           else
>             {
> -             access->size =3D args[i].tree_value;
> +             access->size =3D args[idx].tree_value;
>               gcc_assert (access->ptr =3D=3D NULL_TREE);
>             }
>         }=