[OT] compiler optimisations

[J via Digitalmars-d]

On Thursday, 23 April 2015 at 08:33:56 UTC, John Colvin wrote:
> Why can no compiler I try optimise this toy example as I would 
> expect?
>
> // uncomment if using a C compiler
> // typedef unsigned int uint;
> uint foo(uint a)
> {
>   if (a < 5)
>     return (a * 3) / 3;
>   else
>     return 0;
> }

It is interesting to see how things do get optimized when e.g.
changing the multiply * into a plus +.