# HG changeset patch
# User glx <glx@openttd.org>
# Date 1315267820 0
# Node ID 8277c23f5e3c34a4cae9b8bb94b177a1d8afd75c
# Parent  7a1882ed2d36cf64f964374caadc904e97bc5b75
(svn r22898) -Codechange: use MSVC compiler intrinsics for byte swapping

diff --git a/src/core/bitmath_func.hpp b/src/core/bitmath_func.hpp
--- a/src/core/bitmath_func.hpp
+++ b/src/core/bitmath_func.hpp
@@ -355,6 +355,10 @@
 	 * warnings if we don't cast those (why?) */
 	#define BSWAP32(x) ((uint32)Endian32_Swap(x))
 	#define BSWAP16(x) ((uint16)Endian16_Swap(x))
+#elif defined(_MSC_VER)
+	/* MSVC has intrinsics for swapping, resulting in faster code */
+	#define BSWAP32(x) (_byteswap_ulong(x))
+	#define BSWAP16(x) (_byteswap_ushort(x))
 #else
 	/**
 	 * Perform a 32 bits endianness bitswap on x.