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++METHOS
I post too much
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Joined: 29 Oct 2010
Posts: 4197
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 Posted: Mon Feb 07, 2022 7:12 pm Post subject: Add Fixed Number to Float Value? |
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I am trying to add (float)3 on top of the elevation value, but I am not sure how to do it.
For example, this will not work:
| Code: | mov rdx,[elevation_value]
add rdx,(float)3 // I want to take the elevation_value and add float 3 to it
mov [rdi+78],rdx // [rdi+78] contains vertical coordinate
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This code appears to overwrite rdx with (float) 3 instead of adding it on top of elevation_value for some reason.
To clarify, if elevation_value is (float)100, then I want to be able to add 3 on top of it, so that it becomes (float)103 before it gets loaded into the vertical coordinate value.
How to do this properly?
Thanks.
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Dark Byte
Site Admin
 Reputation: 471
Joined: 09 May 2003
Posts: 25831
Location: The netherlands
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| Posted: Mon Feb 07, 2022 7:26 pm Post subject: |
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probably something like:
| Code: |
alloc(value3,4)
...
value3:
dd (float)3
...
movss xmm1,[elevation_value]
addss xmm1,[value3]
movss [rdi+78],xmm1
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or
| Code: |
mov rdx,[elevation_value]
{$ccode ev=rdxf}
ev=ev+3.0f
{$asm}
mov [rdi+78],rdx
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++METHOS
I post too much
![]() Reputation: 92
Joined: 29 Oct 2010
Posts: 4197
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| Posted: Tue Feb 08, 2022 5:00 am Post subject: |
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You are awesome, DB. Thank you very much.
By the way, the first solution worked, but the second one did not work for some reason.
Thanks so much.
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Csimbi
I post too much
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Joined: 14 Jul 2007
Posts: 3337
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| Posted: Tue Feb 08, 2022 7:33 am Post subject: |
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| Code: | push (float)3.0
addss xmm1,[rsp]
add rsp,8 |
?
If the value is always the same, allocating that and using that address directly like DB suggested is faster.
I.e.
| Code: |
addss xmm1,[myvalue]
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Dark Byte
Site Admin
Reputation: 471
Joined: 09 May 2003
Posts: 25831
Location: The netherlands
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| Posted: Tue Feb 08, 2022 4:21 pm Post subject: |
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| Quote: |
By the way, the first solution worked, but the second one did not work for some reason.
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Right, there is an issue with the XXXf reg notation in ccode (picks the wrong reg)
for now should be able to do:
| Code: |
{$ccode ev=rdx}
float *evfix=(float*)&ev;
*ev=*ev+3.0f
{$asm}
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++METHOS
I post too much
![]() Reputation: 92
Joined: 29 Oct 2010
Posts: 4197
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| Posted: Tue Feb 08, 2022 4:29 pm Post subject: |
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| Thank you, Csimbi and Dark Byte. I really appreciate everyone's help.
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