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    <p>If you're on Linux (or on Windows running under Cygwin), you can figure that out by reading the special file <code>/proc/cpuinfo</code> and looking for the line beginning with <code>vendor_id</code>. If the string is <code>GenuineIntel</code>, you're running on an Intel chip. If you get <code>AuthenticAMD</code>, you're running on an AMD chip.</p> <pre><code>void get_vendor_id(char *vendor_id) // must be at least 13 bytes { FILE *cpuinfo = fopen("/proc/cpuinfo", "r"); if(cpuinfo == NULL) ; // handle error char line[256]; while(fgets(line, 256, cpuinfo)) { if(strncmp(line, "vendor_id", 9) == 0) { char *colon = strchr(line, ':'); if(colon == NULL || colon[1] == 0) ; // handle error strncpy(vendor_id, 12, colon + 2); fclose(cpuinfo); return; } } // if we got here, handle error fclose(cpuinfo); } </code></pre> <p>If you know you're running on an x86 architecture, a less portable method would be to use the CPUID instruction:</p> <pre><code>void get_vendor_id(char *vendor_id) // must be at least 13 bytes { // GCC inline assembler __asm__ __volatile__ ("movl $0, %%eax\n\t" "cpuid\n\t" "movl %%ebx, %0\n\t" "movl %%edx, %1\n\t" "movl %%ecx, %2\n\t" : "=m"(vendor_id), "=m"(vendor_id + 4), "=m"(vendor_id + 8) // outputs : // no inputs : "%eax", "%ebx", "%edx", "%ecx", "memory"); // clobbered registers vendor_id[12] = 0; } int main(void) { char vendor_id[13]; get_vendor_id(vendor_id); if(strcmp(vendor_id, "GenuineIntel") == 0) ; // it's Intel else if(strcmp(vendor_id, "AuthenticAMD") == 0) ; // it's AMD else ; // other return 0; } </code></pre>
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    1. POHow to detect what CPU is being used during runtime?
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    1. USAdam Rosenfield
    1. USAdam Rosenfield
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    1. POHow to detect what CPU is being used during runtime?
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    1. COI am quite sure it will be x86 architecture. Just need to differentiate between AMD and Intel. Although I am using gcc, dont think have access to /proc/cpuinfo.
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      1. USvivekian2
    2. CO/proc/cpuinfo is world readable, so why do you think you can't access it?
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      1. USphihag
    3. COThe program is to run on DOS using DJGPP. So no access to /proc/cpuinfo
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