Re: [PATCH] Use faster byte swapping when compiling with MSVC

From: Erik Faye-Lund <kusmabite@googlemail.com>
Date: Oct 20, 2009, 12:44 UTC
Message-ID: <40aa078e0910200544i3d8aadc1ud62cf62a6964dd5@mail.gmail.com>
In-Reply-To: <loom.20091020T141138-782@post.gmane.org>

On Tue, Oct 20, 2009 at 2:20 PM, Ludvig Strigeus <ludde@spotify.com> wrote:

> 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?

No, unsigned long is 32bit on x64 on Windows.

--->8--- #include <stdio.h> #include <stdlib.h>

int main(int argc, char *argv[])
{
  printf("sizeof(void *) = %d\n", sizeof(void *));
  printf("sizeof(unsigned long) = %d\n", sizeof(unsigned long));
  return 0;
}
--->8---
sizeof(void *) = 8
sizeof(unsigned long) = 4

-- 
Erik "kusma" Faye-Lund