How to align an array of floats in C#? -


I want to align an array of float on C # in 16-byte boundaries.

One technique I know is to pin the array:

I did not like the idea of ​​panning memory. I am worried about the performance of this garbage collection How can it affect

What are the other techniques? I was thinking of creating a 16-byte structure, allocating its array, and then casting the array in an array of float. layout (layout kick)] public structure float 4 {[field offset (0)] public float x; [Field Offset (4)] Public Float Y; [Field Offset (8)] Public Float Zade; [Field Offset (12)] Public Float W; }

I'm not sure what I will do next (casting between different types of arrays) and what's the best way?

tall or Double with your float variable (I think the verifier will allow this, but I'm not sure) or use some manually managed memory. An array that contains approximately 22,000 floats will allocate large object heap; I think an array of IARC 2,000 will be in alliance in the same way, but I do not know whether this treatment applies to 64-bit systems or does it apply to the arrays of the couple's group structures. If your orange is not enough to "relate" to large objects heap, then you may need to allocate a large array and sub-allocate to different consumers manually.

On some editions. Net, it may be possible to allocate an array with three additional elements and use a DLL which accepts the float context, reports 2-3 addresses of bits , And shift floats around an array, ensure proper alignment (like if you want an array of 256 values, assign 259, and if DLL reports that arr [0] addresses 0x12345ABC, use array slots # 1- # 256). The difficulty with such an approach is that GC can move things temporarily from time to time, and one can periodically move the elements up or down in the array so that their alignment is alright can do. Apart from this, I do not know whether it is possible to force the Marshaler to "pass-by-value-results" [later, instead of changing the name of a temporary buffer, to make a real "pass-by-reference", instead the array From the element] By my understanding, some version of .NET is prone to that replacement.

I personally am somewhat surprised that why .NET does not make significant efforts to align with many object cache lines. In the next 16-byte multiple, the padding objects are darkened by an extra 60% of the space in the worst location (most of the 20-byte object being tickled due to a tickle 32); By adding some special-case logic for 12-, 20-, and 24-byte objects, the bad-case overhead can be reduced to 14%. Since most objects are used before reaching their types of references, the performance wins when there is only a few bytes of field data in the same cache line.

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