diff --git a/src/util/util_math.h b/src/util/util_math.h
index e2ad44a5..00392a61 100644
--- a/src/util/util_math.h
+++ b/src/util/util_math.h
@@ -1,5 +1,7 @@
 #pragma once
 
+#include <x86intrin.h>
+
 namespace dxvk {
   
   constexpr size_t CACHE_LINE_SIZE = 64;
@@ -16,4 +18,29 @@ namespace dxvk {
     return (what + to - 1) & ~(to - 1);
   }
   
+  inline uint32_t tzcnt(uint32_t n) {
+    #if defined(__BMI__)
+    return __tzcnt_u32(n);
+    #elif defined(__GNUC__)
+    uint32_t res;
+    uint32_t tmp;
+    asm (
+      "xor %1, %1;"
+      "bsf %2, %0;"
+      "cmovz %1, %0;"
+      : "=&r" (res), "=&r" (tmp)
+      : "r" (n));
+    return res;
+    #else
+    uint32_t r = 31;
+    n &= -n;
+    r -= (n & 0x0000FFFF) ? 16 : 0;
+    r -= (n & 0x00FF00FF) ?  8 : 0;
+    r -= (n & 0x0F0F0F0F) ?  4 : 0;
+    r -= (n & 0x33333333) ?  2 : 0;
+    r -= (n & 0x55555555) ?  1 : 0;
+    return n != 0 ? r : 32;
+    #endif
+  }
+  
 }
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