Re: MMX/3Dnow!/SSE/SSE2 compilers

John Dallman wrote:


> Quite a bit of the library's work is with 3-D points, consisting of
>
> typedef struct { double x, y, z; } vector;
>
> Intel's compiler currently doesn't try to turn:
>
> vector a, b; /* initialise them */
> vector c;
> c.x = a.x + b.x;
> c.y = a.y + b.y;
> c.x = a.z + b.z;
>
> Into two paired loads, a paired add, a paired store, and the same
> unpaired. I believe that it only tries to use paired double-precision
> operations (or quadruple single-precision operations) if it's
> unrolling a loop.


This is the kind of thing that VectorC does, because it is designed
for graphics and games.


Scientific programs tend to use large arrays and so this is where most
vectorization research has been and why we developed VectorC (because
games and graphics use small 3 or 4-dimensional vectors).


--
Andrew Richards
Codeplay


Tel: +44 (0)20 7482 3382
140-142 Kentish Town Rd, London, NW1 9QB
http://www.codeplay.com

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