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Re: [PATCH 3/3] powerpc: Use default st{r,p}cpy optimization for POWER7
- From: Andreas Schwab <schwab at suse dot de>
- To: Adhemerval Zanella <adhemerval dot zanella at linaro dot org>
- Cc: GNU C Library <libc-alpha at sourceware dot org>, Steven Munroe <munroesj at linux dot vnet dot ibm dot com>, Tulio Magno Quites Machado Filho <tuliom at linux dot vnet dot ibm dot com>, Ondřej Bílka <neleai at seznam dot cz>
- Date: Tue, 29 Nov 2016 15:46:52 +0100
- Subject: Re: [PATCH 3/3] powerpc: Use default st{r,p}cpy optimization for POWER7
- Authentication-results: sourceware.org; auth=none
- References: <55B823B2.6060708@linaro.org>
On Jul 29 2015, Adhemerval Zanella <adhemerval.zanella@linaro.org> wrote:
> diff --git a/sysdeps/powerpc/powerpc64/multiarch/stpcpy-ppc64.c b/sysdeps/powerpc/powerpc64/multiarch/stpcpy-ppc64.c
> new file mode 100644
> index 0000000..6e437fb
> --- /dev/null
> +++ b/sysdeps/powerpc/powerpc64/multiarch/stpcpy-ppc64.c
> @@ -0,0 +1,39 @@
> +/* Multiarch stpcpy for PPC64.
> + Copyright (C) 2015 Free Software Foundation, Inc.
> + This file is part of the GNU C Library.
> +
> + The GNU C Library is free software; you can redistribute it and/or
> + modify it under the terms of the GNU Lesser General Public
> + License as published by the Free Software Foundation; either
> + version 2.1 of the License, or (at your option) any later version.
> +
> + The GNU C Library is distributed in the hope that it will be useful,
> + but WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + Lesser General Public License for more details.
> +
> + You should have received a copy of the GNU Lesser General Public
> + License along with the GNU C Library; if not, see
> + <http://www.gnu.org/licenses/>. */
> +
> +#include <string.h>
> +
> +extern __typeof (memcpy) __memcpy_ppc attribute_hidden;
> +extern __typeof (strlen) __strlen_ppc attribute_hidden;
> +extern __typeof (stpcpy) __stpcpy_ppc attribute_hidden;
> +
> +#define STPCPY __stpcpy_ppc
> +#define memcpy __memcpy_ppc
> +#define strlen __strlen_ppc
> +
> +#undef weak_alias
> +#define weak_alias(name, aliasname) \
> + extern __typeof (__stpcpy_ppc) aliasname \
> + __attribute__ ((weak, alias ("__stpcpy_ppc")));
This creates a __GI_stpcpy alias that clashes with the IFUNC symbol in
stpcpy.os.
Andreas.
--
Andreas Schwab, SUSE Labs, schwab@suse.de
GPG Key fingerprint = 0196 BAD8 1CE9 1970 F4BE 1748 E4D4 88E3 0EEA B9D7
"And now for something completely different."