Re: Projects I may be willing to sponsor - FFI Array Sum versus native table results
- From: Szabó Antal <szabo.antal.92@xxxxxxxxx>
- To: luajit@xxxxxxxxxxxxx
- Date: Wed, 10 Dec 2014 22:56:13 +0100
2014-12-10 21:56 GMT+01:00 Joe Ellsworth <joexdobs@xxxxxxxxx>:
> Good catch. Corrected code is http://pastebin.com/jniGqHyp The FFI
> code is still a little faster but not by much.
The generated code in case of the native lua array is almost the same
as the ffi one, the only additional instructions are just to check if
the index is in the array part of the table (I think), so it might not
be worth doing this optimization in this specific usage. However, if
the items are not numbers (doubles), but compound types/structs, then
the lua version would store pointers in the array instead of the data
itself, while with ffi you can make an array of the structs, which
would probably be faster. Actually, the example on the ffi page I
linked before demonstrates exactly this kind of usage.
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