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Diffstat (limited to 'sysdeps/s390/hp-timing.h')
-rw-r--r-- | sysdeps/s390/hp-timing.h | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/sysdeps/s390/hp-timing.h b/sysdeps/s390/hp-timing.h new file mode 100644 index 0000000000..793fb66a4d --- /dev/null +++ b/sysdeps/s390/hp-timing.h @@ -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 */ |