libg722_1  0.1.0
timing.h
1 /*
2  * SpanDSP - a series of DSP components for telephony
3  *
4  * timing.h - Provide access to the Pentium/Athlon TSC timer register
5  *
6  * Written by Steve Underwood <steveu@coppice.org>
7  *
8  * Copyright (C) 2001 Steve Underwood
9  *
10  * All rights reserved.
11  *
12  * This program is free software; you can redistribute it and/or modify
13  * it under the terms of the GNU Lesser General Public License version 2.1,
14  * as published by the Free Software Foundation.
15  *
16  * This program is distributed in the hope that it will be useful,
17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19  * GNU Lesser General Public License for more details.
20  *
21  * You should have received a copy of the GNU Lesser General Public
22  * License along with this program; if not, write to the Free Software
23  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24  *
25  * $Id: timing.h,v 1.1.1.1 2009/11/19 12:10:48 steveu Exp $
26  */
27 
28 #if !defined(_TIMING_H_)
29 #define _TIMING_H_
30 
31 #if defined(__cplusplus)
32 extern "C"
33 {
34 #endif
35 
36 #if defined(__MSVC__)
37 __declspec(naked) unsigned __int64 __cdecl rdtscll(void)
38 {
39  __asm
40  {
41  rdtsc
42  ret ; return value at EDX:EAX
43  }
44 }
45 /*- End of function --------------------------------------------------------*/
46 #elif defined(__GNUC__)
47 #if defined(__i386__)
48 static __inline__ uint64_t rdtscll(void)
49 {
50  uint64_t now;
51 
52  __asm__ __volatile__(" rdtsc\n" : "=A" (now));
53  return now;
54 }
55 /*- End of function --------------------------------------------------------*/
56 #elif defined(__x86_64__)
57 static __inline__ uint64_t rdtscll(void)
58 {
59  unsigned int a;
60  unsigned int d;
61 
62  /* For x86_64 we need to merge the result in 2 32 bit registers
63  into one clean 64 bit result. */
64  __asm__ __volatile__(" rdtsc\n" : "=a" (a), "=d" (d));
65  return ((uint64_t) a) | (((uint64_t) d) << 32);
66 }
67 /*- End of function --------------------------------------------------------*/
68 #else
69 static __inline__ uint64_t rdtscll(void)
70 {
71  /* This architecture doesn't have a suitable timer */
72  return 0llu;
73 }
74 /*- End of function --------------------------------------------------------*/
75 #endif
76 #endif
77 
78 #if defined(__cplusplus)
79 }
80 #endif
81 
82 #endif
83 /*- End of file ------------------------------------------------------------*/