SIMD benchmark

[bearophile]

Walter:

> But don't worry, I'm not planning on working on that at the moment :-)

Until better optimizations are implemented, I see a "simple" optimization for vector ops. When the compiler knows an arrays are very small it unrolls the operation in-place:

int n = 5;
auto a = new int[n];
auto b = new int[n];
a[] += b[];

==>

int n = 5;
auto a = new int[n]; // a and b are dynamic arrays,
auto b = new int[n]; // but their length is easy to find at compile-time
a[0] += b[0];
a[1] += b[1];
a[2] += b[2];
a[3] += b[4];
a[5] += b[5];

Bye,
bearophile