From c3671245e225215f4be2c8c3fde291da2b78e55c Mon Sep 17 00:00:00 2001
From: Luke Street <luke.street@encounterpc.com>
Date: Tue, 10 Dec 2019 17:09:24 -0500
Subject: [PATCH] Add SSE4a CPUID check

---
 src/Math.cpp | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/Math.cpp b/src/Math.cpp
index 8213b52..726b134 100644
--- a/src/Math.cpp
+++ b/src/Math.cpp
@@ -49,7 +49,8 @@ void detectCPU() {
   *reinterpret_cast<int*>((char*)g_cpuFeatures.cpuVendor + 4) = regs[3];
   *reinterpret_cast<int*>((char*)g_cpuFeatures.cpuVendor + 8) = regs[2];
   getCpuInfo(0x80000000, regs);
-  if (regs[0] >= 0x80000004) {
+  int maxExtended = regs[0];
+  if (maxExtended >= 0x80000004) {
     for (unsigned int i = 0x80000002; i <= 0x80000004; i++) {
       getCpuInfo(i, regs);
       // Interpret CPU brand string and cache information.
@@ -79,6 +80,11 @@ void detectCPU() {
     memset((bool*)&g_cpuFeatures.AVX2, ((regs[1] & 0x00000020) != 0), 1);
   }
 
+  if (maxExtended >= 0x80000001) {
+    getCpuInfo(0x80000001, regs);
+    memset((bool*)&g_cpuFeatures.SSE4a, ((regs[2] & (1 << 6)) != 0), 1);
+  }
+
   isCPUInit = true;
 #endif
 }