Nguyen Quy Anh
95 lines
2.0 KiB
C
95 lines
2.0 KiB
C
/* ==================== GNU C and possibly other UNIX compilers ===================== */
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#ifndef _WIN32
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#if defined(__GNUC__) || defined(__linux__)
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#define VOLATILE __volatile__
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#define ASM __asm__
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#else
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/* if we're neither compiling with gcc or under linux, we can hope
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* the following lines work, they probably won't */
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#define ASM asm
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#define VOLATILE
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#endif
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#define myInt64 unsigned long long
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#define INT32 unsigned int
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/* ======================== WIN32 ======================= */
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#else
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#define myInt64 signed __int64
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#define INT32 unsigned __int32
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#endif
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/* This is the RDTSC timer.
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* RDTSC is an instruction on several Intel and compatible CPUs that Reads the
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* Time Stamp Counter. The Intel manuals contain more information.
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*/
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#define COUNTER_LO(a) ((a).int32.lo)
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#define COUNTER_HI(a) ((a).int32.hi)
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#define COUNTER_VAL(a) ((a).int64)
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#define COUNTER(a) \
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((unsigned long long)COUNTER_VAL(a))
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#define COUNTER_DIFF(a,b) \
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(COUNTER(a)-COUNTER(b))
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/* ==================== GNU C and possibly other UNIX compilers ===================== */
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#ifndef _WIN32
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typedef union
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{ myInt64 int64;
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struct {INT32 lo, hi;} int32;
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} tsc_counter;
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#define RDTSC(cpu_c) \
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ASM VOLATILE ("rdtsc" : "=a" ((cpu_c).int32.lo), "=d"((cpu_c).int32.hi))
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#define CPUID() \
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ASM VOLATILE ("cpuid" : : "a" (0) : "bx", "cx", "dx" )
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/* ======================== WIN32 ======================= */
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#else
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typedef union
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{ myInt64 int64;
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struct {INT32 lo, hi;} int32;
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} tsc_counter;
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#define RDTSC(cpu_c) \
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{ __asm rdtsc \
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__asm mov (cpu_c).int32.lo,eax \
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__asm mov (cpu_c).int32.hi,edx \
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}
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#define CPUID() \
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{ \
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__asm mov eax, 0 \
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__asm cpuid \
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}
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#endif
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static void init_tsc() {
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; // no need to initialize anything for x86
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}
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static myInt64 start_tsc(void) {
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tsc_counter start;
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CPUID();
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RDTSC(start);
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return COUNTER_VAL(start);
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}
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static myInt64 stop_tsc(myInt64 start) {
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tsc_counter end;
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RDTSC(end);
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CPUID();
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return COUNTER_VAL(end) - start;
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}
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