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Floats and conditional jumps

 
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Tom331
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Joined: 14 Jul 2007
Posts: 25
PostPosted: Sun Mar 07, 2010 9:02 am    Post subject: Floats and conditional jumps Reply with quote
I'm working on a trainer and need to compare a float value and jump if it is greater than the compare value.
Basically this is what I need, but for floats

Code:
cmp eax, -0.34
jge 543252


I know I need to use FNSTSW AX but I don't understand how to use it.

This is what I have so far
Code:
fld [esp+00000100]
fcomp [877108]
FNSTSW AX


Any help is welcome, thanks Smile
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dEagle
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Joined: 17 Jun 2006
Posts: 225
Location: CheatEngine Forum
PostPosted: Tue Mar 16, 2010 6:34 am    Post subject: Reply with quote
I hope this helps for you.
Code:
00401029  |.  8D7D C0       LEA EDI,DWORD PTR SS:[EBP-40]
0040102C  |.  B9 10000000   MOV ECX,10
00401031  |.  B8 CCCCCCCC   MOV EAX,CCCCCCCC
00401036  |.  F3:AB         REP STOS DWORD PTR ES:[EDI]
00401038  |.  D905 306A4200 FLD DWORD PTR DS:[Value]
0040103E  |.  DC1D 38404200 FCOMP QWORD PTR DS:[__real@8@bffdae147ae>
00401044  |.  DFE0          FSTSW AX
00401046  |.  F6C4 41       TEST AH,41
00401049  |.  75 0D         JNZ SHORT Win32Tes.00401058
0040104B  |.  68 1C404200   PUSH OFFSET Win32Tes.??_C@_0BC@KMGB@Yes?>; /format = "Yes i am higher.
"
00401050  |.  E8 7B000000   CALL Win32Tes.printf                     ; \printf




which belongs to this source code
Code:
float Value =1;

void Compare()
{
if(Value > -0.34)
{
   printf("Yes i am higher.\n");
}


}
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