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From: "goldstein.w.n at gmail dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug string/29839] [2.37 Regression] Wrong result in function
 __strncpy_avx2: 75 != 0
Date: Thu, 01 Dec 2022 22:42:41 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D29839

--- Comment #2 from Noah Goldstein <goldstein.w.n at gmail dot com> ---
(In reply to H.J. Lu from comment #1)
> I am testing this:
>=20
> diff --git a/sysdeps/x86_64/multiarch/strncpy-avx2.S
> b/sysdeps/x86_64/multiarch/strncpy-avx2.S
> index e9afd8fbed..3e6350ce4a 100644
> --- a/sysdeps/x86_64/multiarch/strncpy-avx2.S
> +++ b/sysdeps/x86_64/multiarch/strncpy-avx2.S
> @@ -52,6 +52,10 @@
>=20=20
>    .section SECTION(.text), "ax", @progbits
>  ENTRY(STRNCPY)
> +# ifdef __ILP32__
> +  /* Clear the upper 32 bits.  */
> +  movl  %edx, %edx
> +# endif
>    /* Filter zero length strings and very long strings.  Zero
>       length strings just return, very long strings are handled by
>       just running rep stos{b|l} to zero set (which will almost

evex version will need the same treatment (assuming that works).

--=20
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