There is also a difference between: [self atEnd ifTrue: [^nil]. self next. true] whileTrue. and: [self atEnd ifTrue: [^nil] self next] repeat. Warning: it's quite easy to add Compiler inlining rules, a bit tougher to add corresponding Decompiler tricks. 2009/11/13 Marcus Denker <denker@acm.org>:
On Nov 13, 2009, at 9:51 AM, Cédrick Béler wrote:
Hi,
I noticed quite a difference between the two method who "looks" the same to me. Is it normal ?
Normal. to:do: is lnlined (compiled as jumps in the bytecode), whereas timesRepeat: is a message send with a closure activation.
    Marcus
fun is the difference between:
    (1 to : 10000) do: and     1 to: 10000 do:
one is compiled to jumps, the other not and in addition creates a temp collection.
    Marcus
I use a rc image (haven't tested in squeak). And it's the same on windows and linux.
count := 0. [1 to: 10000000 do: [:i | count :=count + 1]] timeToRun." 677" count := 0. [10000000 timesRepeat: [count := count + 1]] timeToRun" 2571"
If not normal, I'll open a issue.
Thanks
-- Cédrick _______________________________________________ Pharo-project mailing list Pharo-project@lists.gforge.inria.fr http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project
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