Byte Order Swapping Function

[David Nadlinger]

On 7/14/11 12:12 PM, Piotr Szturmaj wrote:
> Yesterday, I had to write my own bswap for ulong because intrinsic
> version supports only uints. Is there any implementation obstacle
> preventing ulong and ushort bswap in core.bitop?
>
> Btw. How compiler intrinsics work? I see there's only bswap declaration
> (without body) in core.bitop. Where can I find compiler code which
> actually substitutes bswap() into real instructions?

The point of the bswap() intrinsic is to allow accessing the x86 bswap 
instruction directly – if I am not mistaken, it should be equivalent to:

int bswap(int val) {
   asm {
     naked;
     bswap EAX;
     ret;
   }
}

David