On 23/09/2010 18:09, stefan...@web.de wrote:
Eduardo<nec...@retena.com> wrote:
Can you try optimize for size? In some cases, it reduces L2 / L3 cache
miss and runs faster than O3. It happens in other compilers and
languages too.
I just tried it: The code gets even slightly larger and much slower (almost a
factor of 2).
Hi,
Try -Os3 instead of -O3
and try to reorder
type
TRectangle = object
width : Integer;
Area : Int64;
NextUnusedRectangle: Integer;
to
type
TRectangle = object
width : Integer;
NextUnusedRectangle: Integer;
Area : Int64;
and the var declaration:
var
i, MinValley, MinValleyWidth: Integer;
PrevBar, NextBar : Integer;
RectWidth : Integer;
NextBarWidth : Integer;
NewEntry, NewEntry2 : Integer;
MinValleyHeight : Integer;
MinValleyArea : Int64;
TotalAreaOfFittingRectangles: Int64;
CurrentRectangle : Integer;
PreviousRectangle : Integer;
OldFirstUnusedRectangle : Integer;
BarCase : TBarCase;
OldPrevNextRectangle : Integer;
It seems a matter of alignment. I tested and could extract a 5% speed
increase (XP and fpc 2.2.4). With 2.4.0 it may not work like that but is
worth a try.
Paulo Costa
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