From: Ludvig Strigeus <ludde@spotify.com>
Date: Tue, 20 Oct 2009 12:20:00 GMT
Subject: Re: [PATCH] Use faster byte swapping when compiling with MSVC
Message-ID: <loom.20091020T141138-782@post.gmane.org>
In-Reply-To: <hbi4mt$tjt$1@ger.gmane.org>

Sebastian Schuberth <sschuberth <at> gmail.com> writes:
> 
> 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.
> 
>  
> +#elif defined(_MSC_VER) && (defined(_M_IX86) || defined(_M_X64))
> +
> +#include <stdlib.h>
> +
> +#define bswap32(x) _byteswap_ulong(x)
> +
> +#endif

unsigned long (as used by _byteswap_ulong) is 64 bits on x64, right? Then it
doesn't make sense to use _byteswap_ulong to swap 32-bit quantities (assuming
that's what bswap32 does) would it?

/Ludde