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ghmarko
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Posted: Fri Mar 20, 2020 7:40 am Post subject: 2D Distance

Hello everyone.. How can i calculate 2D distance between 2 points for example x1 = 562 x2 = 789 y1 = 654 y2 = 698 in assembly

ParkourPenguin
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Posted: Fri Mar 20, 2020 9:35 am Post subject:

If they're doubles:

Code:

movsd xmm0,[x2]
movsd xmm1,[y2]
subsd xmm0,[x1]
subsd xmm1,[y1]
mulsd xmm0,xmm0
mulsd xmm1,xmm1
addsd xmm0,xmm1
sqrtsd xmm0,xmm0
movsd [distance],xmm0

If they're floats, replace *sd with *ss.
If they're integers, use cvtsi2sd.
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ghmarko
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Posted: Fri Mar 20, 2020 12:59 pm Post subject:

ParkourPenguin wrote:

If they're doubles:

Code:

movsd xmm0,[x2]
movsd xmm1,[y2]
subsd xmm0,[x1]
subsd xmm1,[y1]
mulsd xmm0,xmm0
mulsd xmm1,xmm1
addsd xmm0,xmm1
sqrtsd xmm0,xmm0
movsd [distance],xmm0

If they're floats, replace *sd with *ss.
If they're integers, use cvtsi2sd.

if they are integers what?

ParkourPenguin
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Reputation: 140

Joined: 06 Jul 2014
Posts: 4300

Posted: Fri Mar 20, 2020 4:04 pm Post subject:

Code:

pxor xmm0,xmm0
pxor xmm1,xmm1
pxor xmm2,xmm2
cvtsi2sd xmm1,dword ptr[x1]
cvtsi2sd xmm0,dword ptr[x2]
cvtsi2sd xmm2,dword ptr[y1]
subsd xmm0,xmm1
pxor xmm1,xmm1
cvtsi2sd xmm1,dword ptr[y2]
mulsd xmm0,xmm0
subsd xmm1,xmm2
mulsd xmm1,xmm1
addsd xmm0,xmm1
sqrtsd xmm0,xmm0
movsd [distance],xmm0

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