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]
<mailto:[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]
<mailto:[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.
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