mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-22 13:00:06 +00:00
45 lines
1.7 KiB
C
45 lines
1.7 KiB
C
/* High precision, low overhead timing functions. IA-64 version.
|
|
Copyright (C) 2001-2023 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
|
|
#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 int hp_timing_t;
|
|
|
|
/* The Itanium/Merced has a bug where the ar.itc register value read
|
|
is not correct in some situations. The solution is to read again.
|
|
For now we always do this until we know how to recognize a fixed
|
|
processor implementation. */
|
|
#define REPEAT_READ(val) __builtin_expect ((long int) val == -1, 0)
|
|
|
|
/* That's quite simple. Use the `ar.itc' instruction. */
|
|
#define HP_TIMING_NOW(Var) \
|
|
({ unsigned long int __itc; \
|
|
do \
|
|
asm volatile ("mov %0=ar.itc" : "=r" (__itc) : : "memory"); \
|
|
while (REPEAT_READ (__itc)); \
|
|
Var = __itc; })
|
|
|
|
#include <hp-timing-common.h>
|
|
|
|
#endif /* hp-timing.h */
|