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S390: Add support for HP_TIMING_NOW.

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This patch adds support for HP_TIMING_NOW if we build at least
with -march=z10 -mzarch.  Otherwise we are still using the
generic hp-timing.h.

ChangeLog:

	* sysdeps/s390/hp-timing.h: New file.
This commit is contained in:
Stefan Liebler 2019-09-18 16:09:54 +02:00
parent 8cacbcf4a9
commit 2b68087866
2 changed files with 46 additions and 0 deletions

4
ChangeLog

@ -1,3 +1,7 @@
2019-09-18 Stefan Liebler <stli@linux.ibm.com>
* sysdeps/s390/hp-timing.h: New file.
2019-09-18 Joseph Myers <joseph@codesourcery.com>
* sysdeps/unix/sysv/linux/riscv/vfork.S: Do not include

42
sysdeps/s390/hp-timing.h Normal file

@ -0,0 +1,42 @@
/* High precision, low overhead timing functions. s390 version.
Copyright (C) 2019 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
<https://www.gnu.org/licenses/>. */
#ifndef _HP_TIMING_H
/* The stckf instruction is available starting with z9-109 zarch CPUs.
As there is no extra configure check for z9-109, the z10 one is used. */
#ifdef HAVE_S390_MIN_Z10_ZARCH_ASM_SUPPORT
# define _HP_TIMING_H 1
# include <hp-timing-common.h>
/* We use 64 bit values for the times.
Note: Bit 51 is incremented every 0.000 001s = 1us. */
typedef unsigned long long int hp_timing_t;
# define HP_TIMING_INLINE (1)
# define HP_TIMING_NOW(VAR) \
do { \
__asm__ __volatile__ ("stckf %0" : "=Q" (VAR) : : "cc"); \
} while (0)
#else
# include_next <hp-timing.h>
#endif
#endif /* hp-timing.h */