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How to access float number 2, 3, 4 of a xmm register ?

 
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Kerast
How do I cheat?
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Joined: 13 Aug 2016
Posts: 4
PostPosted: Wed Aug 17, 2016 3:49 pm    Post subject: How to access float number 2, 3, 4 of a xmm register ? Reply with quote
Hello,

I have this xmm0 stack that can store 4 floats :

xmm0: 27.23 - 23.40 - 0.00 - 0.00
xmm1: 0.00 - 0.00 - 0.00 - 0.00
xmm2: 0.00 - 0.00 - 0.00 - 0.00
xmm3: 0.00 - 0.00 - 0.00 - 0.00
xmm4: 0.00 - 0.00 - 0.00 - 0.00
xmm5: 0.00 - 0.00 - 0.00 - 0.00
xmm6: 0.00 - 0.00 - 0.00 - 0.00
xmm7: 0.00 - 0.00 - 0.00 - 0.00

When I run this line of code :

Code:
addss xmm0,[AddThisValueToIt] // value = 10


it adds the value to the first float so, 27.3 + 10.0= 37.3

How can I add this value to the second float of the xmm0 register ?
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ParkourPenguin
I post too much
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Joined: 06 Jul 2014
Posts: 4696
PostPosted: Wed Aug 17, 2016 4:11 pm    Post subject: Reply with quote
addps:
Code:
code:
  addps xmm0,[AddThisValueToIt]
  ...

AddThisValueToIt:
  dd (float)10
  dd (float)10
  dd 0
  dd 0
(make sure AddThisValueToIt is 16-byte aligned)

shufps / addss:
Code:
code:
  addss xmm0,[AddThisValueToIt]
  shufps xmm0,xmm0,E1
  addss xmm0,[AddThisValueToIt]
  shufps xmm0,xmm0,E1
  ...

AddThisValueToIt:
  dd (float)10

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