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How to convert integer to float ? [Solved]
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_KRN_
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PostPosted: Sun Aug 21, 2016 7:24 am    Post subject: Reply with quote
mgr.inz.Player wrote:

fild dword ptr [esp]

f - FPU instruction
i - integer
ld - load
dword ptr - it will load 32bit signed integer (m32int)
[esp] - from the top of stack

yes i know but i dont understand that LOAD part
does it mean that it stores the value into special float stack that is different from the [esp] one?
(like push but on float stack) Question
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hhhuut
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PostPosted: Sun Aug 21, 2016 7:31 am    Post subject: Reply with quote
Yes, it loads the value on top of the FPU stack, which is NOT the same as the stack referenced to by ebp and esp!

http://www.cs.binghamton.edu/~sgreene/cs220-2009f/topics/fpu.html
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_KRN_
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PostPosted: Sun Aug 21, 2016 7:49 am    Post subject: Reply with quote
ok thx

last question that wasnt answered yet is:
How to do null-checking?
(like cmp ecx,0)?
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hhhuut
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PostPosted: Sun Aug 21, 2016 7:53 am    Post subject: Reply with quote
Code:
test ecx,ecx
jz originalcode   //jz = jump if zero
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_KRN_
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PostPosted: Sun Aug 21, 2016 8:08 am    Post subject: Reply with quote
and if i do
cmp eax,0
than je code
will jump if eax is zero, same as jz code
right?
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mgr.inz.Player
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PostPosted: Sun Aug 21, 2016 9:51 am    Post subject: Reply with quote
JZ = JE


Those do exactly the same thing:
Code:
cmp ecx,0
jz originalcode

Code:
test ecx,ecx
je originalcode

Code:
cmp ecx,0
je originalcode

Code:
test ecx,ecx
jz originalcode




http://www.jaist.ac.jp/iscenter-new/mpc/altix/altixdata/opt/intel/vtune/doc/users_guide/mergedProjects/analyzer_ec/mergedProjects/reference_olh/mergedProjects/instructions/instruct32_hh/vc144.htm

Code:
74 cb           JE rel8         Jump short if equal (ZF=1)
74 cb           JZ rel8         Jump short if zero (ZF 1)

0F 84 cw/cd     JE rel16/32     Jump near if equal (ZF=1)
0F 84 cw/cd     JZ rel16/32     Jump near if 0 (ZF=1)

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_KRN_
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PostPosted: Sun Aug 21, 2016 3:08 pm    Post subject: Solved ! Reply with quote
OK thanks everyone, this part of my script is finished and working.
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