extl/platform_/windows/counter/rdtsc_counter.h

   1 /* ///////////////////////////////////////////////////////////////////////
   2  * File:                rdtsc_counter.h
   3  *
   4  * Created:             08.02.17
   5  * Updated:             08.11.13
   6  *
   7  * Brief:               The rdtsc_counter class - precision: cpu clock count
   8  *
   9  * [<Home>]
  10  * Copyright (c) 2008-2020, Waruqi All rights reserved.
  11  * //////////////////////////////////////////////////////////////////// */
  12 #ifndef EXTL_PLATFORM_WINDOWS_RDTSC_COUNTER_H
  13 #define EXTL_PLATFORM_WINDOWS_RDTSC_COUNTER_H
  14
  15 /*!\file rdtsc_counter.h
  16  * \brief rdtsc_counter class - precision: cpu clock count
  17  */
  18 #ifndef __cplusplus
  19 #       error rdtsc_counter.h need be supported by c++.
  20 #endif
  21
  22 /* ///////////////////////////////////////////////////////////////////////
  23  * Includes
  24  */
  25 #include "prefix.h"
  26
  27 /* ///////////////////////////////////////////////////////////////////////
  28  * Compatibility
  29  */
  30 #ifndef EXTL_WINDOWS_COUNTER_RDTSC_COUNTER_SUPPORT
  31 #       error rdtsc_counter.h is not supported by current compiler.
  32 #endif
  33
  34 // 'rdtsc' : no return value
  35 #if defined(EXTL_COMPILER_IS_MSVC) && (_MSC_VER ==1200)
  36 #       pragma warning(disable:4035)
  37 // missing return statement at stop of non-void function "rdtsc"
  38 #elif defined(EXTL_COMPILER_IS_INTEL)
  39 #       pragma warning(disable:1011)
  40 // Function should return a value in function rdtsc_counter::rdtsc() const
  41 #elif defined(EXTL_COMPILER_IS_BORLAND)
  42 #       pragma warn -8070
  43 #endif
  44
  45 /* ///////////////////////////////////////////////////////////////////////
  46  * ::extl::platform::windows namespace
  47  */
  48 EXTL_WINDOWS_BEGIN_WHOLE_NAMESPACE
  49
  50 /*!\brief rdtsc_counter class
  51  *
  52  * \ingroup extl_group_counter
  53  */
  54 class rdtsc_counter
  55 {
  56         /// \name Constructors
  57         /// @{
  58         public :
  59                 rdtsc_counter();
  60         /// @}
  61
  62         /// \name Types
  63         /// @{
  64         private:
  65                 typedef rdtsc_counter           class_type;
  66
  67 #ifndef EXTL_64BIT_INT_SUPPORT
  68                 typedef e_uint64_t                      interval_type;
  69                 typedef e_uint64_t                      size_type;
  70 #else
  71                 typedef e_uint32_t                      interval_type;
  72                 typedef e_uint32_t                      size_type;
  73 #endif
  74         /// @}
  75
  76         /// \name Operations
  77         /// @{
  78         public:
  79                 inline void start();
  80                 inline void stop();
  81         /// @}
  82
  83         /// \name Attributes
  84         /// @{
  85         public:
  86                 inline interval_type            count() const;
  87
  88         private:
  89         #ifdef EXTL_INLINE_ASM_IN_INLINE_SUPPORT
  90                 inline size_type                        rdtsc() const;
  91         #else
  92                 size_type                                       rdtsc() const;
  93         #endif
  94         /// @}
  95
  96         /// \name Members
  97         /// @{
  98         private:
  99                 size_type m_start;
 100                 size_type m_stop;
 101         /// @}
 102 };
 103
 104 /* ///////////////////////////////////////////////////////////////////////
 105  * Class implementation
 106  */
 107 inline rdtsc_counter::rdtsc_counter()
 108         : m_start(0), m_stop(0)
 109 {
 110 }
 111
 112 #ifdef EXTL_INLINE_ASM_IN_INLINE_SUPPORT
 113 inline rdtsc_counter::size_type rdtsc_counter::rdtsc() const
 114 #else
 115 rdtsc_counter::size_type rdtsc_counter::rdtsc() const
 116 #endif
 117 {
 118 #ifdef EXTL_INLINE_ASM_SUPPORT
 119         __asm CPUID
 120         /* __asm _emit 0x0F */
 121         /* __asm _emit 0xA2 */
 122         __asm RDTSC
 123         /* __asm _emit 0x0F */
 124         /* __asm _emit 0x31 */
 125 #endif
 126 }
 127
 128 inline void rdtsc_counter::start()
 129 {
 130         m_start = rdtsc();
 131 }
 132 inline void rdtsc_counter::stop()
 133 {
 134         m_stop = rdtsc();
 135 }
 136 inline rdtsc_counter::interval_type rdtsc_counter::count() const
 137 {
 138         EXTL_ASSERT(m_stop >= m_start);
 139         return static_cast<interval_type>(m_stop - m_start);
 140 }
 141
 142 /* ///////////////////////////////////////////////////////////////////////
 143  * ::extl::platform::windows namespace
 144  */
 145 EXTL_WINDOWS_END_WHOLE_NAMESPACE
 146
 147 /* //////////////////////////////////////////////////////////////////// */
 148 #endif /* EXTL_PLATFORM_WINDOWS_RDTSC_COUNTER_H */
 149 /* //////////////////////////////////////////////////////////////////// */