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Re: [PATCH v2 6/8] aarch64: Add hp-timing.h
- From: Andrew Pinski <pinskia at gmail dot com>
- To: Richard Henderson <rth at twiddle dot net>
- Cc: GNU C Library <libc-alpha at sourceware dot org>, Will Newton <will dot newton at linaro dot org>, Marcus Shawcroft <marcus dot shawcroft at arm dot com>
- Date: Wed, 2 Jul 2014 23:43:35 -0700
- Subject: Re: [PATCH v2 6/8] aarch64: Add hp-timing.h
- Authentication-results: sourceware.org; auth=none
- References: <1404363026-23526-1-git-send-email-rth at twiddle dot net> <1404363026-23526-7-git-send-email-rth at twiddle dot net>
On Wed, Jul 2, 2014 at 9:50 PM, Richard Henderson <rth@twiddle.net> wrote:
> * sysdeps/aarch64/hp-timing.h: New file.
> ---
> sysdeps/aarch64/hp-timing.h | 38 ++++++++++++++++++++++++++++++++++++++
> 1 file changed, 38 insertions(+)
> create mode 100644 sysdeps/aarch64/hp-timing.h
>
> diff --git a/sysdeps/aarch64/hp-timing.h b/sysdeps/aarch64/hp-timing.h
> new file mode 100644
> index 0000000..18cb54f
> --- /dev/null
> +++ b/sysdeps/aarch64/hp-timing.h
> @@ -0,0 +1,38 @@
> +/* High precision, low overhead timing functions. AArch64 version.
> + Copyright (C) 2014 Free Software Foundation, Inc.
> + This file is part of the GNU C Library.
> + Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
Is this true?
Thanks,
Andrew
> +
> + 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/>. */
> +
> +#ifndef _HP_TIMING_H
> +#define _HP_TIMING_H 1
> +
> +/* We always assume having the cycle counter register. */
> +#define HP_TIMING_AVAIL (1)
> +
> +/* We indeed have inlined functions. */
> +#define HP_TIMING_INLINE (1)
> +
> +/* We use 64bit values for the times. */
> +typedef unsigned long long int hp_timing_t;
> +
> +/* Sync the instruction stream, and read from the virtual cycle counter. */
> +#define HP_TIMING_NOW(Var) \
> + __asm__ __volatile__ ("isb; mrs %0, cntvct_el0" : "=r" (Var))
> +
> +#include <hp-timing-common.h>
> +
> +#endif /* hp-timing.h */
> --
> 1.9.3
>