Function detect_cpu_isa

Source/astcenccli_entry.cpp:70–98

* @brief Detect platform CPU ISA support and update global trackers. */

 * @brief Detect platform CPU ISA support and update global trackers.
 */
static void detect_cpu_isa()
{
	int data[4];

	__cpuid(data, 0);
	int num_id = data[0];

	if (num_id >= 1)
	{
		__cpuidex(data, 1, 0);
		// SSE41 = Bank 1, ECX, bit 19
		g_cpu_has_sse41 = data[2] & (1 << 19) ? true : false;
		// POPCNT = Bank 1, ECX, bit 23
		g_cpu_has_popcnt = data[2] & (1 << 23) ? true : false;
		// F16C = Bank 1, ECX, bit 29
		g_cpu_has_f16c = data[2] & (1 << 29) ? true : false;
	}

	if (num_id >= 7)
	{
		__cpuidex(data, 7, 0);
		// AVX2 = Bank 7, EBX, bit 5
		g_cpu_has_avx2 = data[1] & (1 << 5) ? true : false;
	}

	// Ensure state bits are updated before init flag is updated
	MemoryBarrier();
	g_init = true;
}

/* ============================================================================
   Platform code for GCC and Clang