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
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 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
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 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
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
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.
_
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
