The next gen of hardware will support native double precision (AFAIK).
my point is that there's native and there's native. if the HW supports
doubles, but they take 8x as long, then there's still a huge reason to
make sure the program uses only low-precision. and 8x (WAG, of course)
may actually be enough so that a 4-core, full-rate SSE CPU to beats it...
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