More extensions to C

[Ron Natalie <ron>]

In article <856 at bentley.UUCP>, kwh at bentley.UUCP (KW Heuer) writes:
> 
> >(BTW, a really good optimizing compiler can optimize out the temporary.  I'm
> >not fully up on what optimizers are doing these days, but I doubt that there
> >are many compilers which do this.  Optimizing it out is easier if it is
> >declared locally ("{int temp = x; x = y; y = temp;}") instead of being
> >declared at the top of the routine.)
> 
> Unfortunately, I think the "clue" gets lost before the optimizing phase.
> 
Eh?  Unless you have a machine that has an exchange operator, the compiler
is going to have to allocate a temporary anyhow.  I can't see yow a compiler
could generate better code for  x,,y than what most compilers (even before
optimization do for {register temp =x; x=y; y=temp}.

-Ron

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