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ASM to Delphi

Posted on 2006-10-28
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Last Modified: 2013-11-22
I neet to port this ASM function to Delphi because .Net does not support ASM...

Any help would be apprciated...

Thanks!


   function FTan (Angle: Extended): Extended;
     asm
            fld      [Angle]      
            ffree      st(7)      
            fptan                
            fstp      st(0)      
            fwait

     end;
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Question by:PaulP
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4 Comments
 
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Expert Comment

by:tobjectpascal
ID: 17827753
Yes, another reason why i don't like .NET you can only use what they give you, it's not really that flexible at all.
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Expert Comment

by:TName
ID: 17828162
Have you tried sinply using Tan() instead? (Presuming the Math library for .Net is similar to the Win32 one...)
Does Delphi for .Net itself use assembler? You might want to look at your Delphi version's tan function (there has to be one) and see if it's similar.

BTW, this is how tan() looks like in D7's Math.pas:

function Tan(const X: Extended): Extended;
asm
        FLD    X
        FPTAN
        FSTP   ST(0)      { FPTAN pushes 1.0 after result }
        FWAIT
end;

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LVL 28

Expert Comment

by:TName
ID: 17828194
>this is how tan() looks like in D7's Math.pas
So the only differences are that here the angle value is passed as a const and that your function frees the last stack register before computing the tangent.
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TName earned 250 total points
ID: 17828458
I think System.Math.Tan() should be the .Net equivalent.
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