core.simd and dynamic arrays

[John C. via Digitalmars-d-learn]

Hello everyone. I am complete newbie in D and programming at all 
and I can't understand why dynamic arrays can't be used within 
following D code:
```d
import std.random : uniform01;
import core.simd;
void main() {
    align(32) float[] a = new float[128];
    align(32) float[] b = new float[128];
    align(32) float[] c = new float[128];

    /* filling input arrays with random numbers in [0, 1) range */
    for (size_t i = 0; i < c.length; ++i) {
        a[i], b[i] = uniform01(), uniform01();
    }

    for (size_t i = 0; i < c.length; i += 8) {
        /* seems that segfault reason hides below */
        auto va = *cast(float8 *)(&a[i]);
        auto vb = *cast(float8 *)(&b[i]);
        auto vc = va * vb;
        *cast(float8 *)(&c[i]) = vc;
    }
}
```

I have tested same code (but used instead static arrays of size 
8) and it worked correctly. For bigger static arrays code above 
even outperformed one-by-one element iterative version.
I'm using LDC compiler 1.36.0 on x86_64 Linux system with "-w -O3 
-mattr=+avx" compiler flags.