Florian Klaempfl schreef:
Daniël Mantione wrote:
Op Tue, 10 Oct 2006, schreef Florian Klaempfl:
Yesterday, I've implemented tail recursion optimization
(http://svn.freepascal.org/svn/fpc/trunk/compiler/opttail.pas resulting in
http://www.hu.freepascal.org/fpcircbot/cgipastebin?msgid=158 pp11 is the new
compiler, fpc11 the old, both are 2.1.1).
Wow!
Well, it's use for real world applications is limited but for the typical
recursive useless benchmark stuff it's nice to have and it wasn't much work.
I tried this with the recursive benchmark:
http://svn.freepascal.org/svn/fpc/trunk/tests/bench/shootout/src/recursive.pp
Using fpc
2.0.4: 9.1 s
2.1.1: 8.1 s
with {$OPTIMIZATION tailrec}: 6.0 s.
gcc is 2.6 times faster than fpc 2.0.4 (see
http://shootout.alioth.debian.org/gp4/benchmark.php?test=recursive&lang=all)
so it would do 3.5 seconds about this benchmark.
Vincent
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