[PATCH] Use faster byte swapping when compiling with MSVC

From: Sebastian Schuberth <sschuberth@gmail.com>
Date: Oct 19, 2009, 16:37 UTC
Message-ID: <hbi4mt$tjt$1@ger.gmane.org>

When compiling with MSVC on x86-compatible, use an intrinsic for byte swapping. In contrast to the GCC path, we do not prefer inline assembly here as it is not supported for the x64 platform.

Signed-off-by: Sebastian Schuberth <sschuberth@gmail.com>
---
 compat/bswap.h |   10 ++++++++++
 1 files changed, 10 insertions(+), 0 deletions(-)

diff --git a/compat/bswap.h b/compat/bswap.h
index 5cc4acb..279e0b4 100644
--- a/compat/bswap.h
+++ b/compat/bswap.h
@@ -28,6 +28,16 @@ static inline uint32_t default_swab32(uint32_t val)
 	} \
 	__res; })
 
+#elif defined(_MSC_VER) && (defined(_M_IX86) || defined(_M_X64))
+
+#include <stdlib.h>
+
+#define bswap32(x) _byteswap_ulong(x)
+
+#endif
+
+#ifdef bswap32
+
 #undef ntohl
 #undef htonl
 #define ntohl(x) bswap32(x)

-- 
1.6.5.rc2.13.g1be2