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#if !defined(GB_COMPILER_MSVC)
#if defined(GB_CPU_X86)
#include <cpuid.h>
#endif
#endif
gb_internal void odin_cpuid(int leaf, int result[]) {
#if defined(GB_CPU_ARM) || defined(GB_CPU_RISCV)
return;
#elif defined(GB_CPU_X86)
#if defined(GB_COMPILER_MSVC)
__cpuid(result, leaf);
#else
__get_cpuid(leaf, (unsigned int*)&result[0], (unsigned int*)&result[1], (unsigned int*)&result[2], (unsigned int*)&result[3]);
#endif
#endif
}
gb_internal bool should_use_march_native() {
#if !defined(GB_CPU_X86)
return false;
#else
int cpu[4];
odin_cpuid(0x1, &cpu[0]); // Get feature information in ECX + EDX
bool have_popcnt = cpu[2] & (1 << 23); // bit 23 in ECX = popcnt
return !have_popcnt;
#endif
}
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