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small dude using instructions

 
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Xblade Of Heaven
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PostPosted: Thu Oct 13, 2016 12:17 pm    Post subject: small dude using instructions Reply with quote
Hi all guys, to see if anyone can help

i have a problem using 2 instrucions.

For example i ca use this

Code:
fild dword ptr [eax+44]//load a integer value
fstp dword ptr [eax+40]//store a float value


is corret, but now i try this:

Code:
fild dword ptr [eax+44]//load a integer value
fistp dword ptr [eax+40]//store a integer value


and in this second case the loaded value change to a wrong value, anyone can explain me why? thanks!
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ParkourPenguin
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PostPosted: Thu Oct 13, 2016 12:23 pm    Post subject: Reply with quote
Could you be more specific and say what the values are?
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Xblade Of Heaven
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PostPosted: Thu Oct 13, 2016 12:33 pm    Post subject: Reply with quote
yep

are the hp values, max and current values

100 in 4bytes

eax+44 store max hp 100 and eax+40 is current HP
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ParkourPenguin
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PostPosted: Thu Oct 13, 2016 12:40 pm    Post subject: Reply with quote
Works perfectly fine for me. fild converts the 4-byte value to extended and loads it onto the FPU stack, and fistp converts the extended value back to 4-byte, stores it at that address, and pops the FPU stack.

By asking that question, I meant more so what value fistp was storing and what value you intended for it to store.
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Xblade Of Heaven
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PostPosted: Thu Oct 13, 2016 1:14 pm    Post subject: Reply with quote
yeah, is working fine... is my fault wrong instruction position...

thanks man, regards
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Zanzer
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PostPosted: Thu Oct 13, 2016 1:18 pm    Post subject: Reply with quote
Code:
fild dword ptr [eax+44]
Loads integer 100 (hex 00000064) as float 100 (hex 42C80000) to FPU stack.

Code:
fstp dword ptr [eax+40]
Pops float 100 (hex 42C80000) as float 100 (hex 42C80000) from FPU stack.

Code:
fistp dword ptr [eax+40]
Pops float 100 (hex 42C80000) as integer 100 (hex 00000064) from FPU stack.
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Xblade Of Heaven
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PostPosted: Thu Oct 13, 2016 2:29 pm    Post subject: Reply with quote
thanks Very Happy
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