xref: /phasta/phastaIO/rdtsc.h (revision 595995161822a203c8467e0e4a253d7bd7d6df32) 
1 #ifndef __RDTSC_H_DEFINED__
2 #define __RDTSC_H_DEFINED__
3 
4 
5 #if defined(__i386__)
6 
rdtsc(void)7 static __inline__ unsigned long long rdtsc(void)
8 {
9  unsigned long long int x;
10     __asm__ volatile (".byte 0x0f, 0x31" : "=A" (x));
11     return x;
12 }
13 #elif defined(__x86_64__)
14 
15 // typedef unsigned long long int unsigned long long;
16 
rdtsc(void)17 static __inline__ unsigned long long rdtsc(void)
18 {
19  unsigned hi, lo;
20  __asm__ __volatile__ ("rdtsc" : "=a"(lo), "=d"(hi));
21  return ( (unsigned long long)lo)|( ((unsigned long long)hi)<<32 );
22 }
23 
24 #elif defined(__powerpc__)
25 
26 // typedef unsigned long long int unsigned long long;
27 
rdtsc(void)28 static __inline__ unsigned long long rdtsc(void)
29 {
30  unsigned long long int result=0;
31  unsigned long int upper, lower,tmp;
32  __asm__ volatile(
33                "0:                  \n"
34                "\tmftbu   %0           \n"
35                "\tmftb    %1           \n"
36                "\tmftbu   %2           \n"
37                "\tcmpw    %2,%0        \n"
38                "\tbne     0b         \n"
39                : "=r"(upper),"=r"(lower),"=r"(tmp)
40                );
41  result = upper;
42  result = result<<32;
43  result = result|lower;
44 
45  return(result);
46 }
47 
48 #else
49 
50 #error "No tick counter is available!"
51 
52 #endif
53 
54 #endif
55