Soumyadip Das Mahapatra wrote:
quoted text
> static void u32_swap(void *a, void *b)
> {
>     *(u32 *)b ^= *(u32 *)a ^= *(u32 *)b ^= *(u32 *)a;
> }
>   

That was posted to comp.lang.c 20 years ago or more.  It's not something
that the compiler is likely to be able to optimize (unlike the normal
swap, using a temporary variable.)

Another cute, temp-free swap, from the same era, is: b += a -= b; a = b - a.
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