7 Sep
2011
7 Sep
'11
1:17 p.m.
I am trying to code a simple operation using SSE2 instructions where possible. I have a feeling that what I want to do is just a matter of a couple of shufps and haddps instructions but I can't get it. Lazyweb please help!
The operation is integration. I have a vector of 4 single floats (v4sf) and a carry-in float to start.
For example
CI F0 F1 F2 F3 5 1 0 10 -5
Yields
F0 F1 F2 F3 6 6 16 11
So far iteration on plain floats seems to be the best I can come up with, but HADDPS is tantalizingly close to what I want to do. Any hints?
Thanks, Bill Gribble