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How can i compact this code

 
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TwinShards
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PostPosted: Sun Sep 01, 2024 12:00 am    Post subject: How can i compact this code Reply with quote
I was wondering if there was any OpCode that can compare a full xmm register?

That's my code, which work but this take a lot of space.

Code:

newmem:
Coordinates:
dd (float)-1163.856689
dd (float)278.9642334
dd (float)-1801.525757
dd (float)25.4696312

newmem+100:
movss xmm0,[Coordinates]
comiss xmm0,[rsi]
jne originalcode
movss xmm0,[Coordinates+04]
comiss xmm0,[rsi+04]
jne originalcode
movss xmm0,[Coordinates+08]
comiss xmm0,[rsi+08]
jne originalcode
movss xmm0,[Coordinates+0C]
comiss xmm0,[rsi+0C]
jne originalcode
xorps xmm0,xmm0
jmp returnhere
originalcode:
movups xmm0,[r14]
subps xmm0,[rsi]
jmp returnhere
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Csimbi
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PostPosted: Sun Sep 01, 2024 1:39 pm    Post subject: Reply with quote
Have not done this before, so I am merely guessing...
Read up on PCMPEQB/PCMPEQW/PCMPEQD in Intel manual and take it from there?
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atom0s
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PostPosted: Sun Sep 01, 2024 3:21 pm    Post subject: Reply with quote
You could make use of SIMD to load and test all 4 coords at once.

You can use movaps ( https://www.felixcloutier.com/x86/movaps ) to load the current 4 coords you wish to compare at the same time.

You can use xorps ( https://www.felixcloutier.com/x86/xorps ) against your 'Coordinates' values to perform an XOR against all of the values at the same time.

You can use ptest ( https://www.felixcloutier.com/x86/ptest ) to test if any of the coords were different.
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ParkourPenguin
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PostPosted: Sun Sep 01, 2024 4:30 pm    Post subject: Reply with quote
Code:
cmpneqps xmm0,xmm1
movmskps eax,xmm0
test eax,eax
jnz notequal
// xmm0 == xmm1
...
notequal:
// xmm0 != xmm1
...

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TwinShards
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PostPosted: Sun Sep 01, 2024 7:10 pm    Post subject: Reply with quote
Thank atom0s, exactly what i was looking for.
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