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Another Question About XMM Registers

 
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++METHOS
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PostPosted: Fri Jan 15, 2016 3:55 am    Post subject: Another Question About XMM Registers Reply with quote
How do I go about doubling up only the first two values inside the xmm0 register? The below script does what I want, except it basically NOP's the third value:

Code:
addps xmm0,xmm0
addps xmm0,xmm0
movq xmm0,xmm0


I tried shuffling the values, doing my add and then shuffling them back, but it's not working. Maybe I am doing something wrong?

Code:
addss xmm0,xmm0
shufps xmm0,xmm0,e1
addss xmm0,xmm0
shufps xmm0,xmm0,e4


Thanks.

EDIT:
I don't know if this is the best approach. What I am trying to do is increase player speed, but the game that I am working on does not have a traditional jump capability, and when you start running really fast and step on a curb or something, sometimes your player goes air-born and starts flying in the air. I have incorporated a way to cancel that when it happens, but I was hoping for something automated.
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mgr.inz.Player
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PostPosted: Fri Jan 15, 2016 8:36 am    Post subject: This post has 2 review(s) Reply with quote
Use another SSE register:
Code:
movhlps xmm1,xmm0 -- move element 2 and 3 to xmm1 (as element 0 and 1)
addps xmm0,xmm0
movlhps xmm0,xmm1 -- move element 0 and 1 to xmm0 (as element 2 and 3)



Code:
before:
xmm0   |   X0  |  X1  |  X2  |  X3  |
-------------------------------------
           2      3      4      5


after:
xmm0   |   X0  |  X1  |  X2  |  X3  |
-------------------------------------
           4      6      4      5



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++METHOS
I post too much
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Joined: 29 Oct 2010
Posts: 4197
PostPosted: Fri Jan 15, 2016 4:47 pm    Post subject: Reply with quote
Awesome. It works. Thanks!

I have to wait to give you +rep. Mr. Green
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