From 7e9e93bc6764d65e26a5cb4f3fc6462c52ab075d Mon Sep 17 00:00:00 2001
From: Sebastian Schuberth <sschuberth@gmail.com>
Date: Mon, 19 Oct 2009 18:28:50 +0200
Subject: [PATCH] Use faster byte swapping when compiling with MSVC

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>
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
---
 compat/bswap.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/compat/bswap.h b/compat/bswap.h
index 5cc4acbfcc..279e0b48b1 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)
-- 
2.11.4.GIT