That's curious. Who are "they" ? It doesn't sound like any floating point implementation I ever came across in Delphi (or anywhere else, for that matter). O.o
On 17 August 2014 12:28, Pieter De Wit <[email protected]> wrote: > Hi Jolyon, > > From memory, they used 2 int32's to make a float - this could have been > int16's - memory is very vague on this :) The one was used to represent the > whole numbers and the other was to show the decimal numbers > > Cheers, > > Pieter > > > On 17/08/2014 12:05, Jolyon Smith wrote: > > @Pieter - I don't understand what you mean when you say that "float was > int32.int32". For starters, "float" is an imprecise term. If you mean > "single" then the entire value was always 32 bit in it's entirety. If you > mean double then it was always 64 bit. What is this "in32.int32" type of > which you speak ? O.o > > > On 17 August 2014 11:52, Jolyon Smith <[email protected]> wrote: > >> I think there are too many variables involved to give an answer to this >> question without some of those variables being reduced to known values. >> >> e.g. what hardware ? what version of Delphi ? x64 target or x86 ? >> what precision of floating point ? >> >> Having said that, in a quick test knocked up in my Smoketest framework I >> found that Double comfortably outperforms Int64 when compiling for Win32 >> but that both Double and Int64 demonstrated improved performance when >> compiling for Win64 and that whilst Double still showed some advantage it >> was not as significant (and in some test runs the difference was >> negligible). >> >> If you are targeting FireMonkey you will have to bear in mind that the >> back-end compiler is different to the x86/x64 backend, so results obtained >> using the WinXX compilers will not necessarily be indicative of performance >> on the ARM or LLVM platforms. >> >> >> Conditions: >> >> - Delphi XE4 >> - Running in a 64-bit Win 7 VM >> - No testing was done for correctness of the results. >> >> >> >> >> >> On 16 August 2014 15:30, Ross Levis <[email protected]> wrote: >> >>> Would I be correct that int64 multiplications would be faster than >>> floating point in Delphi? My app needs to do several million. >>> >>> >>> >>> _______________________________________________ >>> NZ Borland Developers Group - Delphi mailing list >>> Post: [email protected] >>> Admin: http://delphi.org.nz/mailman/listinfo/delphi >>> Unsubscribe: send an email to [email protected] with >>> Subject: unsubscribe >>> >> >> > > > _______________________________________________ > NZ Borland Developers Group - Delphi mailing list > Post: [email protected] > Admin: http://delphi.org.nz/mailman/listinfo/delphi > Unsubscribe: send an email to [email protected] with > Subject: unsubscribe > > > > _______________________________________________ > NZ Borland Developers Group - Delphi mailing list > Post: [email protected] > Admin: http://delphi.org.nz/mailman/listinfo/delphi > Unsubscribe: send an email to [email protected] with > Subject: unsubscribe >
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