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1 // Copyright (c) 2004, Google Inc. | 1 // Copyright (c) 2004, Google Inc. |
2 // All rights reserved. | 2 // All rights reserved. |
3 // | 3 // |
4 // Redistribution and use in source and binary forms, with or without | 4 // Redistribution and use in source and binary forms, with or without |
5 // modification, are permitted provided that the following conditions are | 5 // modification, are permitted provided that the following conditions are |
6 // met: | 6 // met: |
7 // | 7 // |
8 // * Redistributions of source code must retain the above copyright | 8 // * Redistributions of source code must retain the above copyright |
9 // notice, this list of conditions and the following disclaimer. | 9 // notice, this list of conditions and the following disclaimer. |
10 // * Redistributions in binary form must reproduce the above | 10 // * Redistributions in binary form must reproduce the above |
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40 // Also, in some out of order CPU implementations, the CycleClock is not | 40 // Also, in some out of order CPU implementations, the CycleClock is not |
41 // serializing. So if you're trying to count at cycles granularity, your | 41 // serializing. So if you're trying to count at cycles granularity, your |
42 // data might be inaccurate due to out of order instruction execution. | 42 // data might be inaccurate due to out of order instruction execution. |
43 // ---------------------------------------------------------------------- | 43 // ---------------------------------------------------------------------- |
44 | 44 |
45 #ifndef GOOGLE_BASE_CYCLECLOCK_H_ | 45 #ifndef GOOGLE_BASE_CYCLECLOCK_H_ |
46 #define GOOGLE_BASE_CYCLECLOCK_H_ | 46 #define GOOGLE_BASE_CYCLECLOCK_H_ |
47 | 47 |
48 #include "base/basictypes.h" // make sure we get the def for int64 | 48 #include "base/basictypes.h" // make sure we get the def for int64 |
49 #include "base/arm_instruction_set_select.h" | 49 #include "base/arm_instruction_set_select.h" |
| 50 // base/sysinfo.h is really big and we don't want to include it unless |
| 51 // it is necessary. |
| 52 #if defined(__arm__) || defined(__mips__) |
| 53 # include "base/sysinfo.h" |
| 54 #endif |
50 #if defined(__MACH__) && defined(__APPLE__) | 55 #if defined(__MACH__) && defined(__APPLE__) |
51 # include <mach/mach_time.h> | 56 # include <mach/mach_time.h> |
52 #endif | 57 #endif |
53 // For MSVC, we want the __rdtsc intrinsic, declared in <intrin.h>. | 58 // For MSVC, we want to use '_asm rdtsc' when possible (since it works |
54 // Unfortunately, in some environments, <windows.h> and <intrin.h> have | 59 // with even ancient MSVC compilers), and when not possible the |
55 // conflicting declarations of some other intrinsics, breaking compilation. | 60 // __rdtsc intrinsic, declared in <intrin.h>. Unfortunately, in some |
| 61 // environments, <windows.h> and <intrin.h> have conflicting |
| 62 // declarations of some other intrinsics, breaking compilation. |
56 // Therefore, we simply declare __rdtsc ourselves. See also | 63 // Therefore, we simply declare __rdtsc ourselves. See also |
57 // http://connect.microsoft.com/VisualStudio/feedback/details/262047 | 64 // http://connect.microsoft.com/VisualStudio/feedback/details/262047 |
58 #if defined(_MSC_VER) | 65 #if defined(_MSC_VER) && !defined(_M_IX86) |
59 extern "C" uint64 __rdtsc(); | 66 extern "C" uint64 __rdtsc(); |
60 #pragma intrinsic(__rdtsc) | 67 #pragma intrinsic(__rdtsc) |
61 #endif | 68 #endif |
| 69 #if defined(ARMV3) || defined(__mips__) |
62 #ifdef HAVE_SYS_TIME_H | 70 #ifdef HAVE_SYS_TIME_H |
63 #include <sys/time.h> | 71 #include <sys/time.h> |
64 #endif | 72 #endif |
| 73 #endif |
65 | 74 |
66 // NOTE: only i386 and x86_64 have been well tested. | 75 // NOTE: only i386 and x86_64 have been well tested. |
67 // PPC, sparc, alpha, and ia64 are based on | 76 // PPC, sparc, alpha, and ia64 are based on |
68 // http://peter.kuscsik.com/wordpress/?p=14 | 77 // http://peter.kuscsik.com/wordpress/?p=14 |
69 // with modifications by m3b. See also | 78 // with modifications by m3b. See also |
70 // https://setisvn.ssl.berkeley.edu/svn/lib/fftw-3.0.1/kernel/cycle.h | 79 // https://setisvn.ssl.berkeley.edu/svn/lib/fftw-3.0.1/kernel/cycle.h |
71 struct CycleClock { | 80 struct CycleClock { |
72 // This should return the number of cycles since power-on. Thread-safe. | 81 // This should return the number of cycles since power-on. Thread-safe. |
73 static inline int64 Now() { | 82 static inline int64 Now() { |
74 #if defined(__MACH__) && defined(__APPLE__) | 83 #if defined(__MACH__) && defined(__APPLE__) |
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101 return (tbu1 << 32) | tbl; | 110 return (tbu1 << 32) | tbl; |
102 #elif defined(__sparc__) | 111 #elif defined(__sparc__) |
103 int64 tick; | 112 int64 tick; |
104 asm(".byte 0x83, 0x41, 0x00, 0x00"); | 113 asm(".byte 0x83, 0x41, 0x00, 0x00"); |
105 asm("mov %%g1, %0" : "=r" (tick)); | 114 asm("mov %%g1, %0" : "=r" (tick)); |
106 return tick; | 115 return tick; |
107 #elif defined(__ia64__) | 116 #elif defined(__ia64__) |
108 int64 itc; | 117 int64 itc; |
109 asm("mov %0 = ar.itc" : "=r" (itc)); | 118 asm("mov %0 = ar.itc" : "=r" (itc)); |
110 return itc; | 119 return itc; |
| 120 #elif defined(_MSC_VER) && defined(_M_IX86) |
| 121 // Older MSVC compilers (like 7.x) don't seem to support the |
| 122 // __rdtsc intrinsic properly, so I prefer to use _asm instead |
| 123 // when I know it will work. Otherwise, I'll use __rdtsc and hope |
| 124 // the code is being compiled with a non-ancient compiler. |
| 125 _asm rdtsc |
111 #elif defined(_MSC_VER) | 126 #elif defined(_MSC_VER) |
112 return __rdtsc(); | 127 return __rdtsc(); |
113 #elif defined(ARMV3) | 128 #elif defined(ARMV3) |
114 #if defined(ARMV6) // V6 is the earliest arch that has a standard cyclecount | 129 #if defined(ARMV6) // V6 is the earliest arch that has a standard cyclecount |
115 uint32 pmccntr; | 130 uint32 pmccntr; |
116 uint32 pmuseren; | 131 uint32 pmuseren; |
117 uint32 pmcntenset; | 132 uint32 pmcntenset; |
118 // Read the user mode perf monitor counter access permissions. | 133 // Read the user mode perf monitor counter access permissions. |
119 asm("mrc p15, 0, %0, c9, c14, 0" : "=r" (pmuseren)); | 134 asm volatile ("mrc p15, 0, %0, c9, c14, 0" : "=r" (pmuseren)); |
120 if (pmuseren & 1) { // Allows reading perfmon counters for user mode code. | 135 if (pmuseren & 1) { // Allows reading perfmon counters for user mode code. |
121 asm("mrc p15, 0, %0, c9, c12, 1" : "=r" (pmcntenset)); | 136 asm volatile ("mrc p15, 0, %0, c9, c12, 1" : "=r" (pmcntenset)); |
122 if (pmcntenset & 0x80000000ul) { // Is it counting? | 137 if (pmcntenset & 0x80000000ul) { // Is it counting? |
123 asm("mrc p15, 0, %0, c9, c13, 0" : "=r" (pmccntr)); | 138 asm volatile ("mrc p15, 0, %0, c9, c13, 0" : "=r" (pmccntr)); |
124 // The counter is set up to count every 64th cycle | 139 // The counter is set up to count every 64th cycle |
125 return static_cast<int64>(pmccntr) * 64; // Should optimize to << 6 | 140 return static_cast<int64>(pmccntr) * 64; // Should optimize to << 6 |
126 } | 141 } |
127 } | 142 } |
128 #endif | 143 #endif |
129 struct timeval tv; | 144 struct timeval tv; |
130 gettimeofday(&tv, NULL); | 145 gettimeofday(&tv, NULL); |
131 return static_cast<int64>(tv.tv_sec) * 1000000 + tv.tv_usec; | 146 return static_cast<int64>((tv.tv_sec + tv.tv_usec * 0.000001) |
| 147 * CyclesPerSecond()); |
| 148 #elif defined(__mips__) |
| 149 // mips apparently only allows rdtsc for superusers, so we fall |
| 150 // back to gettimeofday. It's possible clock_gettime would be better. |
| 151 struct timeval tv; |
| 152 gettimeofday(&tv, NULL); |
| 153 return static_cast<int64>((tv.tv_sec + tv.tv_usec * 0.000001) |
| 154 * CyclesPerSecond()); |
132 #else | 155 #else |
133 // The soft failover to a generic implementation is automatic only for ARM. | 156 // The soft failover to a generic implementation is automatic only for ARM. |
134 // For other platforms the developer is expected to make an attempt to create | 157 // For other platforms the developer is expected to make an attempt to create |
135 // a fast implementation and use generic version if nothing better is available. | 158 // a fast implementation and use generic version if nothing better is available. |
136 #error You need to define CycleTimer for your O/S and CPU | 159 #error You need to define CycleTimer for your O/S and CPU |
137 #endif | 160 #endif |
138 } | 161 } |
139 }; | 162 }; |
140 | 163 |
141 | 164 |
142 #endif // GOOGLE_BASE_CYCLECLOCK_H_ | 165 #endif // GOOGLE_BASE_CYCLECLOCK_H_ |
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