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authorglx <glx@openttd.org>2011-09-06 00:10:20 +0000
committerglx <glx@openttd.org>2011-09-06 00:10:20 +0000
commit2c20738067e6cd4f49ce063967c93776b583066a (patch)
tree24066f046afefa8c61a1ea1724dd162419738310
parent29814047938c083417ec4cea0dd8f66bd92ea444 (diff)
downloadopenttd-2c20738067e6cd4f49ce063967c93776b583066a.tar.xz
(svn r22898) -Codechange: use MSVC compiler intrinsics for byte swapping
-rw-r--r--src/core/bitmath_func.hpp4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/core/bitmath_func.hpp b/src/core/bitmath_func.hpp
index a881ee81d..d10003007 100644
--- a/src/core/bitmath_func.hpp
+++ b/src/core/bitmath_func.hpp
@@ -355,6 +355,10 @@ static FORCEINLINE T ROR(const T x, const uint8 n)
* 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.