attributes: fix clzll on 32-bit MSVC

include/common/attributes.h

@@ -87,11 +87,20 @@ static inline int clz(const unsigned int mask) {
     return (31 - leading_zero);
 }
 
+#ifndef _M_IX86
 static inline int clzll(const unsigned long long mask) {
     unsigned long leading_zero = 0;
     _BitScanReverse64(&leading_zero, mask);
     return (63 - leading_zero);
 }
+#else /* _M_IX86 */
+static inline int clzll(const unsigned long long mask) {
+    if (mask >> 32)
+        return clz((unsigned)(mask >> 32));
+    else
+        return clz((unsigned)mask) + 32;
+}
+#endif /* _M_IX86 */
 #else /* !_MSC_VER */
 static inline int ctz(const unsigned int mask) {
     return __builtin_ctz(mask);