From: Sebastian Schuberth <sschuberth@gmail.com>
Date: Mon, 19 Oct 2009 16:37:05 +0000 (+0200)
Subject: Use faster byte swapping when compiling with MSVC
X-Git-Tag: v1.6.6-rc0~90
X-Git-Url: https://git.tokkee.org/?a=commitdiff_plain;h=0fcabdeb52b79775173d009ccc179db104dfbb66;p=git.git

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: Junio C Hamano <gitster@pobox.com>
---

diff --git a/compat/bswap.h b/compat/bswap.h
index 5cc4acbfc..279e0b48b 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)