From 7ede782d02a93e331cba5b3b81ae1144b677c844 Mon Sep 17 00:00:00 2001
From: Niklas Fiekas <niklas.fiekas@backscattering.de>
Date: Mon, 19 Sep 2016 22:27:48 +0200
Subject: [PATCH] Use __builtin_ctzll as fallback if available

---
 board.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/board.h b/board.h
index e2aac52..7790a90 100644
--- 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