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37 lines
792 B
C
37 lines
792 B
C
// read the processor time stamp register
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#if defined __ICC
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#define USE_RDTSC 1
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#define rdtsc _rdtsc
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#elif defined __i386__
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#define USE_RDTSC 1
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static inline unsigned long long rdtsc() {
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unsigned long hi, lo;
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__asm__ __volatile__ ("rdtsc\n"
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"movl %%edx,%0\n"
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"movl %%eax,%1" : "=r"(hi), "=r"(lo) : : "edx", "eax");
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return ((unsigned long long) hi << 32ULL) + (unsigned long long) lo;
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}
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#elif defined __x86_64__
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#define USE_RDTSC 1
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static inline unsigned long long rdtsc() {
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unsigned long long r;
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__asm__ __volatile__ ("rdtsc\n"
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"shl $32,%%rdx\n"
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"or %%rdx,%%rax\n"
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"movq %%rax,%0" : "=r"(r) : : "edx", "eax", "rdx", "rax");
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return r;
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}
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#else
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#define USE_RDTSC 0
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#endif
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