Casting a vector operation

[Andrej Mitrovic]

So, I need to convert a float[] to an int[] for some use with audio. The conversion operation is to multiply each sample (the value) with 0x7FFF_0000, and decrement with .5f, round this operation to an int and store it as the new sample.

So here's how a float>int conversion looks like:

http://codepad.org/bqINREKG


Now, I wanted to replace the foreach loop with a vector op. So first I've tried this:

writeTo[] = to!int((data[] * 0x7FFF_0000) - 0.5f)

This won't work. I've tried to do a simple cast:

writeTo[] = cast(int[])((data[] * 0x7FFF_0000) - 0.5f);

floatToInt.d(26): Error: Array operation data[] * 0x1.fffcp+30F - 0.5F not implemented

Same thing if I use to!int[]. I'm not sure what this error means.

Unfortunately I have little understanding of vector ops. Is there any way to use a vector op that operates on floats but stores each result as an int?

Btw, the *actual* definition of a single channel is:
void*[2] buffers;

These are two "half-buffers", meaning that the soundcard reads from one half-buffer while the client fills the other half. 

Should I be worried that these are typed as void*? I mean I've read something about a GC problem where the GC could interpret the value stored in a void* as a pointer to random data in the heap, which could lead to memory leaks, or something of that sort.