mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-05 11:11:04 +00:00
51 lines
1.9 KiB
C
51 lines
1.9 KiB
C
/* High precision, low overhead timing functions. powerpc64 version.
|
|
Copyright (C) 2005-2020 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
|
|
|
|
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
|
|
#define _HP_TIMING_H 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;
|
|
|
|
/* That's quite simple. Use the `mftb' instruction. Note that the value
|
|
might not be 100% accurate since there might be some more instructions
|
|
running in this moment. This could be changed by using a barrier like
|
|
'lwsync' right before the `mftb' instruction. But we are not interested
|
|
in accurate clock cycles here so we don't do this. */
|
|
|
|
#define HP_TIMING_NOW(Var) \
|
|
do { \
|
|
unsigned int hi, lo, tmp; \
|
|
__asm__ __volatile__ ("1: mfspr %0,269;" \
|
|
" mfspr %1,268;" \
|
|
" mfspr %2,269;" \
|
|
" cmpw %0,%2;" \
|
|
" bne 1b;" \
|
|
: "=&r" (hi), "=&r" (lo), "=&r" (tmp) \
|
|
: : "cr0"); \
|
|
Var = ((hp_timing_t) hi << 32) | lo; \
|
|
} while (0)
|
|
|
|
#include <hp-timing-common.h>
|
|
|
|
#endif /* hp-timing.h */
|