Performance updates

[Bill Baxter]

On Fri, Nov 14, 2008 at 7:49 AM, Moritz Warning <moritzwarning at web.de> wrote:
> On Thu, 13 Nov 2008 06:19:27 -0500, bearophile wrote:
>
>> In this post I show few things I have found/collected in the last weeks
>> related to the performance of the code compiled with DMD.
>>
> [..]
>>
>> The D1 docs strongly suggest to use foreach every time it's possible,
>> avoiding to use the less handy for(), so for almost a year I have
>> assumed foreach is as fast as the for() but this two versions shows
>> differences:
>>
>
> I have noticed the same problem with foreach.
> A for loop is often faster. :/

One thing to be clear about when talking about the speed of foreach is
whether you're using it on a built-in array or on a user type with an
opApply.  The former is expected to be as fast as for(), the latter is
definitely not because it has to call a delegate each time around the
loop.

--bb