cpuid.cpp

Go to the documentation of this file.

#include "pfc.h"


#if PFC_HAVE_CPUID

namespace pfc {
    bool query_cpu_feature_set(unsigned p_value) {
#ifdef _MSC_VER
        __try {
#endif
            if (p_value & (CPU_HAVE_SSE | CPU_HAVE_SSE2 | CPU_HAVE_SSE3 | CPU_HAVE_SSSE3 | CPU_HAVE_SSE41 | CPU_HAVE_SSE42)) {
                int buffer[4];
                __cpuid(buffer,1);
                if (p_value & CPU_HAVE_SSE) {
                    if ((buffer[3]&(1<<25)) == 0) return false;
                }
                if (p_value & CPU_HAVE_SSE2) {
                    if ((buffer[3]&(1<<26)) == 0) return false;
                }
                if (p_value & CPU_HAVE_SSE3) {
                    if ((buffer[2]&(1<<0)) == 0) return false;
                }
                if (p_value & CPU_HAVE_SSSE3) {
                    if ((buffer[2]&(1<<9)) == 0) return false;
                }
                if (p_value & CPU_HAVE_SSE41) {
                    if ((buffer[2]&(1<<19)) == 0) return false;
                }
                if (p_value & CPU_HAVE_SSE42) {
                    if ((buffer[2]&(1<<20)) == 0) return false;
                }
            }
    #ifdef _M_IX86
            if (p_value & (CPU_HAVE_3DNOW_EX | CPU_HAVE_3DNOW)) {
                int buffer_amd[4];
                __cpuid(buffer_amd,0x80000000);
                if ((unsigned)buffer_amd[0] < 0x80000001) return false;
                __cpuid(buffer_amd,0x80000001);
            
                if (p_value & CPU_HAVE_3DNOW) {
                    if ((buffer_amd[3]&(1<<31)) == 0) return false;
                }
                if (p_value & CPU_HAVE_3DNOW_EX) {
                    if ((buffer_amd[3]&(1<<30)) == 0) return false;
                }
            }
    #endif
            return true;
#ifdef _MSC_VER
        } __except(1) {
            return false;
        }
#endif
    }
}

#endif