Merge pull request #6 from niklasf/gnuc-ctzll

Use __builtin_ctzll as fallback if available
georgvonzimmermann · Sep 20, 2016 · fe75994 · fe75994
2 parents 3f539c9 + 7ede782
commit fe75994
Showing 1 changed file with 7 additions and 0 deletions.
diff --git a/board.h b/board.h
@@ -278,6 +278,13 @@ int firstSquare(qword a)
 		: "cc");
 	return (int)res;
 }
+#elif defined(__GNUC__)
+inline
+int firstSquare(qword a)
+{
+    assert(a != 0);
+    return __builtin_ctzll(a);
+}
 #else
 #error not a supported architecture
  // If someone wants to support non-intel architectures, there are some (slower) C versions