This may be a stupid question, but I just discovered FPC so please bear with
me...
I have been writing Delphi programs since 1996 or so (when Delphi 2 was
released), so I am rather comfortable with that.
Now I need to write for the Linux platform because we are trying to make a
Linux front end
stefan...@web.de schrieb:
My experience is that linked lists with pointers are much slower than linked lists realized by arrays.
That's my experience too. I converted a few programs from linked lists to array
of pointers and the speed increase was always dramatically.
_
On 24.09.2010 14:35, Jonas Maebe wrote:
>
> On 24 Sep 2010, at 11:48, Adrian Veith wrote:
>
>> Changing to pointers reduces the amount of multiplications for accessing
>> the nth element in an array - if you compare the delphi code to th fpc
>> code on assembler base, this is the main difference
On 24 Sep 2010, at 14:35, Jonas Maebe wrote:
On 24 Sep 2010, at 11:48, Adrian Veith wrote:
Register allocation is on a comparable level for both versions.
Delphi keeps the "Bar" pointer in a register, while FPC spills it to
the stack. Because Bar is used in most of the most-executed
sta
Hi Adrian,
"Adrian Veith" wrote:
[...]
>
>we optimized the code further and eliminated the all Next, Prev: Integer
>etc to and changed them to pointers again. Here are the results:
[...]
>first optimization - saving redundant array access to pointers:
[...]
>next optimization - changed code to u
On 24 Sep 2010, at 11:48, Adrian Veith wrote:
Changing to pointers reduces the amount of multiplications for
accessing
the nth element in an array - if you compare the delphi code to th fpc
code on assembler base, this is the main difference in both generated
codes.
Did you actually try rep
On 24.09.2010 10:37, Jonas Maebe wrote:
>
> On 24 Sep 2010, at 08:06, Adrian Veith wrote:
>
>> On 23.09.2010 17:03, Jonas Maebe wrote:
>>>
>>> It may help a lot, but only because it will reduce register pressure,
>>> not because the multiplications are gone.
>>
>> It reduces the total number of m
On 24 Sep 2010, at 08:06, Adrian Veith wrote:
On 23.09.2010 17:03, Jonas Maebe wrote:
It may help a lot, but only because it will reduce register pressure,
not because the multiplications are gone.
It reduces the total number of multiplications about 70% - I gave the
code to one of my guys
