On 23 Sep 2010, at 16:59, Adrian Veith wrote:
I analyzed your code - I think the problem is the array element
address
calculation of the fpc compiler. You have a lot of code like
Bar[MinValley] etc. The delphi compile uses the lea assembler code for
this, whereas fpc calculates the address of one element with imul
which
is much slower.
Please see the last paragraph of
http://lists.freepascal.org/lists/fpc-pascal/2010-September/026510.html
Anyway you could speed up your code significantly if you
help the compiler by reducing the address calculations with the help
of
pointers like this:
It may help a lot, but only because it will reduce register pressure,
not because the multiplications are gone.
Jonas
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