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Guard CPUID/rdtsc for non-x86 and add stubs #182

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Guard CPUID/rdtsc for non-x86 and add stubs #182

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5 changes: 4 additions & 1 deletion Fastor/config/cpuid.h
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Original file line number Diff line number Diff line change
Expand Up @@ -43,11 +43,14 @@ class CPUID {
#ifdef _WIN32
__cpuid((int *)regs, (int)i);

#else
#elif defined(__x86_64__) || defined(__i386__)
asm volatile
("cpuid" : "=a" (regs[0]), "=b" (regs[1]), "=c" (regs[2]), "=d" (regs[3])
: "a" (i), "c" (0));
// ECX is set to zero for CPUID function 4
#else
(void)i;
regs[0] = regs[1] = regs[2] = regs[3] = 0;
#endif
}

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7 changes: 6 additions & 1 deletion Fastor/util/timeit.h
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Expand Up @@ -101,7 +101,7 @@ inline uint64_t rdtsc_end() {
return __rdtsc();
}
// Linux/GCC
#else
#elif defined(__x86_64__) || defined(__i386__)
inline uint64_t rdtsc() {
unsigned int lo, hi;
// This does not clobber the register so rdtsc overwrites
Expand Down Expand Up @@ -158,6 +158,11 @@ inline uint64_t rdtsc_end() {
inline uint64_t rdtsc_begin() { return rdtsc();}
inline uint64_t rdtsc_end() { return rdtsc();}
#endif
#else
// ARM/non-x86 stubs
inline uint64_t rdtsc() { return 0; }
inline uint64_t rdtsc_begin() { return 0; }
inline uint64_t rdtsc_end() { return 0; }
#endif


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