Re: Projects I may be willing to sponsor
- From: Stefano <phd.st.p@xxxxxxxxx>
- To: luajit@xxxxxxxxxxxxx
- Date: Wed, 10 Dec 2014 19:50:16 +0000
On 10 Dec 2014 18:39, "Szabó Antal" <szabo.antal.92@xxxxxxxxx> wrote:
>
> 2014-12-10 19:15 GMT+01:00 Joseph Ellsworth <joexdobs@xxxxxxxxx>:
>>
>> The sample / example would allocate the array, Fill it with a set of
doubles read from a file, Run the sum and return both the sum and average
value.
>
>
> Here is a sample code for what I suppose you want:
http://pastebin.com/cj7jShfj
>
> The summation loop looks like this in x64 assembly (use -jdump with
luajit to get it):
>
> ->LOOP:
> 7ffc8350ff80 addsd xmm7, [rax+rdi*8+0x8]
> 7ffc8350ff86 add edi, +0x01
> 7ffc8350ff89 cmp edi, 0x270f
> 7ffc8350ff8f jle 0x7ffc8350ff80 ->LOOP
>
> As far as I can tell, this is the shortest and fastest you can get
without using vector instructions, which LuaJIT doesn't currently support.
For something more end-user-friendly (for this project at least) than bare
FFI the author might be interested in my the algebra module of an open
source project I'm working on:
http://scilua.org/sci_alg.html
Stefano
>
>
> Antal Szabó
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