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How to add a double value?

 
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Filipe_Br
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PostPosted: Wed Feb 01, 2017 2:28 pm    Post subject: How to add a double value? Reply with quote
I have the following opcode.
Code:

movq xmm5,[esi+10]
movq [edi+00000100],xmm5

I'd like to increase the 'xmm5' value before its value is written to '[edi + 00000100]'.
It would be something like that.
Code:

add xmm5,(double)10

Only in a way that works.
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Matze500
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PostPosted: Wed Feb 01, 2017 4:14 pm    Post subject: Reply with quote
Code:
add [esi+10],"Your value"
movq xmm5,[esi+10]
movq [edi+00000100],xmm5


That should do the trick.

Geets Matze
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Filipe_Br
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PostPosted: Wed Feb 01, 2017 4:45 pm    Post subject: Reply with quote
What if I want to directly increase 'xmm5'. You know how you do it?
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Zanzer
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PostPosted: Wed Feb 01, 2017 9:01 pm    Post subject: Reply with quote
Code:
label(myvar)

// ... other stuff

code:
  addsd xmm5,[myvar]
  // ... original code
  jmp return

// between jump and injection
myvar:
  dq (double)10

INJECT:
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Filipe_Br
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PostPosted: Thu Feb 02, 2017 4:21 am    Post subject: Reply with quote
Zanzer wrote:
Code:
label(myvar)

// ... other stuff

code:
  addsd xmm5,[myvar]
  // ... original code
  jmp return

// between jump and injection
myvar:
  dq (double)10

INJECT:

That's exactly what I needed.
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SunBeam
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PostPosted: Thu Feb 02, 2017 8:09 am    Post subject: This post has 1 review(s) Reply with quote
See this as well (they're under SSE2 instructions, not MMX): http://docs.oracle.com/cd/E19253-01/817-5477/epmpv/index.html OR here: http://softpixel.com/~cwright/programming/simd/sse2.php (navigate left tree).
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