Squaring Arrays without Overlapping Array Error

[jmh530 via Digitalmars-d-learn]

If I call a function like

int[] square_array(int[] x)
{
	return x[] *= x[];
}

I get an error that there is an overlapping array in a vector 
operation. I guess this makes sense as the lhs and rhs are 
occupying the same memory. Nevertheless, I find it a little 
frustrating.

I tried two alternatives, one just adds a temporary duplicate 
array for the lhs x[] in the above, while the other uses a 
foreach loop. Both get correct results without errors, but also 
have their issues. Duplicating requires memory allocation, which 
makes it slower for small arrays. Foreach (ignoring parallelism 
or SIMD) tends to be slower for larger arrays, I take it due to 
compiler optimizations for vector operations.

Are there any other alternatives here?