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Fresco
Grandmaster Cheater
![]() Reputation: 4
Joined: 07 Nov 2010
Posts: 600
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 Posted: Thu Mar 15, 2012 8:01 am Post subject: Re: jump if value is below 0 |
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| Freiza wrote: | Try this
| Code: | fld dword ptr [value] ; load -1
ftst ; compare with 0
fstsw ax ; load status word to ax
sahf ; transfer condition to flag register
jb here ; jump if below |
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i finally got it working, after some reading
the code above you mentioned has just 1 error:
| Code: | | fstsw ax ; load status word to ax |
it should be:
| Code: | | fnstsw ax // copy FPU FLAGS to AX (EAX splits into AX; and AX splits into AH and AL) |
and the final working code is this:
| Code: | pushfd // push FLAGS
push eax // push EAX
fld dword ptr [float_val] // load float value to comapare (push [float_val] on TOS [Top Of the Stack])
fcom dword ptr [comp_val] // compare float value with another float
fnstsw ax // copy FPU FLAGS to AX (EAX splits into AX; and AX splits into AH and AL)
sahf // copy AH to FLAGS
ja Store_MAX // compare condition (jump if above)
ftst // compare FPU TOS with zero
fnstsw ax // copy FPU FLAGS to AX
sahf // copy AH to FLAGS
jb Store_MIN // compare condition (jump if below)
nop
Store_MAX:
nop // if [float_val] is bigger than 100 then store 100 into [float_val]
mov dword ptr [float_val],42C80000
jmp Continue
nop
Store_MIN:
nop if [float_val] is below zero (negative) then store 0 into [float_val]
mov dword ptr [float_val],00000000
jmp Continue
nop
comp_val:
db 00 00 C8 42
Continue:
nop // after you finish
fstp st(0) // pop out from FPU TOS [float_val] -- [ FPU TOS = st(0) ]
pop eax // pop EAX , because we used it to copy the flags
popfd // pop the actual FLAGS
// continue code ... |
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... Fresco |
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Freiza
Grandmaster Cheater
 Reputation: 22
Joined: 28 Jun 2010
Posts: 662
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| Posted: Thu Mar 15, 2012 8:25 am Post subject: |
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According to the situation you gave me. Fstsw was also fine.
Anyway I am happy your problem is solved.
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mgr.inz.Player
I post too much
 Reputation: 223
Joined: 07 Nov 2008
Posts: 4438
Location: W kraju nad Wisla. UTC+01:00
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| Posted: Mon Mar 19, 2012 8:54 am Post subject: Re: jump if value is below 0 |
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| Fresco wrote: |
the code above you mentioned has just 1 error:
| Code: | | fstsw ax ; load status word to ax |
it should be:
| Code: | | fnstsw ax // copy FPU FLAGS to AX (EAX splits into AX; and AX splits into AH and AL) |
|
Should be:
fstsw ax - copy FPU FLAGS to AX, wait version
fnstsw ax - copy FPU FLAGS to AX, no wait version
Btw.
compare [eax+160] with another value, for example, 4.0.
I'm using this:
| Code: | pushfd // store eflags, push
push eax // store eax, push
push (float)4 // push compare value, now 4.0 is at [esp] (the top of stack)
fld dword ptr [eax+00000160] // load value to compare
fcomp dword ptr [esp] // comparing, and pop
fstsw word ptr [esp] // store FPU status at stack
pop eax // pop stack (move FPU status to eax)
sahf // copy AH to eflags
pop eax // restore original eax
ja short exit // jump if [eax+160] is bigger than 4
// health is low, restoring to 100%
mov dword ptr [eax+00000160], (float)100
exit:
popfd //restore original eflags
jmp returnhere |
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