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1/* High precision, low overhead timing functions. Alpha version.
2 Copyright (C) 2001-2019 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Richard Henderson <rth@redhat.com>, 2001.
5
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
10
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
15
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library. If not, see
18 <http://www.gnu.org/licenses/>. */
19
20#ifndef _HP_TIMING_ALPHA_H
21#define _HP_TIMING_ALPHA_H 1
22
23#if IS_IN(rtld)
24/* We always have the timestamp register, but it's got only a 4 second
25 range. Use it for ld.so profiling only. */
26# define HP_TIMING_INLINE (1)
27
28/* We use 32 bit values for the times. */
29typedef unsigned int hp_timing_t;
30
31/* The "rpcc" instruction returns a 32-bit counting half and a 32-bit
32 "virtual cycle counter displacement". Subtracting the two gives us
33 a virtual cycle count. */
34# define HP_TIMING_NOW(VAR) \
35 do { \
36 unsigned long int x_; \
37 asm volatile ("rpcc %0" : "=r"(x_)); \
38 (VAR) = (int) (x_) - (int) (x_ >> 32); \
39 } while (0)
40# include <hp-timing-common.h>
41
42#else
43# include <sysdeps/generic/hp-timing.h>
44#endif /* IS_IN(rtld) */
45
46#endif /* hp-timing.h */
47

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