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From: "570070308 at qq dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/109484] [Wrong Code][inline-asm] output operands
 overlap with output
Date: Wed, 12 Apr 2023 11:03:13 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109484

--- Comment #2 from =E3=80=82 <570070308 at qq dot com> ---
(In reply to Richard Biener from comment #1)
> but you clobber 'temp' early and fail to indicate that so GCC allocates t=
he
> same register as part of the "+m" output.

The requirements you describe are not reflected in the documentation. The
document only says that `GCC assumpts that the assembler code consumes its
inputs before producing outputs`, and this code fits the assumption. First,=
 it
reads the input from %1, then write the output to %0, then write the output=
 to
%1. No outputs happend before inputs.=