On Tuesday, 3 August 2021 at 12:33:56 UTC, james.p.leblanc wrote:
Concise question:
=================
I would like to use dynamic arrays, not for their
dynamic sizing properties per se' (slicing, appending, etc).
But, more for their memory protection and efficiencies (for
example,using foreach).
However, I must have the start of my array at an avx
friendly 32 byte alignment.
Is this easily acheivable?
Background:
===========
I am interfacing with fftw. If I use the fftw_malloc, then
I am forced to either:
1) copy to/from the allocated arrays to/from my "standard"
dlang dynamic arrays (loss of efficiency). or ...
2) use standard array/pointer mechanisms everywhere(loss
of memory safely).
My thinking is that I could forego the use of the fftw_malloc,
and simply hand fftw functions my (properly aligned) pointer
of my dlang dynamic array.
All thoughts, comments, hints, greatly appreciated!
James
AFAIK, the GC only guarantees an alignment of 16. But you can
turn any memory allocation into a slice, simply via
```
size_t length = ...;
T* myPtr = cast(T*) fftw_malloc(length * T.sizeof); // or
aligned_alloc, posix_memalign etc.
T[] mySlice = myPtr[0 .. length];
foreach (ref e; mySlice) ...
// free!
```
