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Faster than FloatToStr command...?

Hello all, does anyone know of a faster/more efficient alternative to the Delphi FloatToStr function?

Thanks
   Shawn

P.S: I'm using Delphi 7.
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shawn857
Asked:
shawn857
2 Solutions
 
Sinisa VukCommented:
I use win format function:
Format('%5.2f', [123.456789]);

Open in new window


hint: if you interested to see other faster algorithms:
http://fastcode.sourceforge.net/
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shawn857Author Commented:
thanks Sinisa. Regarding the Format function - I won't know what size the real number will be beforehand. It could be 12.8 or 12228763521.65255362. So would I be able to use a Format statement like Format('%30.20f') ?

I looked briefly at the fastcode page. Do you know if there's a "FloatToStr" function there?

Thanks!
    Shawn
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Sinisa VukCommented:
No, there is not FloatToStr (yet) on fastcode page.
I don't suggest to show more than 8 decimal places - and this should be fine too:

Label1.Caption := Format('%.8f', [12228763521.65255362]);

Open in new window


... or

Label1.Caption := Format('%f', [12228763521.65255362]);

Open in new window


... with default formatting.
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shawn857Author Commented:
Thanks Sinisa, I'll try that.

Looking at the Fastcode page, I noticed there were a few other routines that would be useful for me. I'm a little confused about the usage though. It seems for each fucntion, there are many different ways to call it:

function  XXXFastcodeP4N;
function  XXXFastcodeP4P;
function  XXXFastcodePMD;
function  XXXFastcodePMB;
function  XXXFastcodeAthlonXP;
function  XXXFastcodeAMD64;

I don't really want a "hardware-specific" version...Is any one of these okay, or do you know if there is just a regular "generic" way to call the function?

Thanks!
    Shawn
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Sinisa VukCommented:
Using assembler variant of function for Intel processors is a good way too.
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shawn857Author Commented:
Thanks Sinisa. How do I know which one is the assembler variant function for intel processors?

Thanks
   Shawn
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shawn857Author Commented:
Sinisa, I just tried a small profiling run comparing FloatToStr and your suggestion of "Format" command... FloatToStr is actually slightly faster:

FloatToStr -   0.00000074 secs Avg Time
Format('%f' - 0.00000084 secs Avg Time

... maybe there is just no improving on FloatToStr?

Cheers
    Shawn
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Geert GruwezOracle dbaCommented:
look at the complete picture ... for improvements
does the input have to be a float ?

this may be an odd question ... but what if you got an integer for the integer part
and an integer for the fractional part

inttostr is probably somewhat faster than floattostr
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shawn857Author Commented:
Hi Geert, well, that won't help for the odd times when the float number happens to be in Scientific Notation.

Thanks
   Shawn
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shawn226Commented:
Yes, we can just abandon it... sorry for that. A pretty nit-picky question from me to begin with actually...

Regards
   Shawn
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