Most performant way of converting int to string
rumbu via Digitalmars-d-learn
digitalmars-d-learn at puremagic.com
Tue Dec 22 12:52:07 PST 2015
On Tuesday, 22 December 2015 at 19:45:46 UTC, Daniel Kozák wrote:
> V Tue, 22 Dec 2015 18:11:24 +0000
> rumbu via Digitalmars-d-learn
> <digitalmars-d-learn at puremagic.com>
>> On Tuesday, 22 December 2015 at 17:15:27 UTC, Andrew Chapman
>> > Sorry if this is a silly question but is the to! method from
>> > the conv library the most efficient way of converting an
>> > integer value to a string?
>> > e.g.
>> > string s = to!string(100);
>> > I'm seeing a pretty dramatic slow down in my code when I use
>> > a conversion like this (when looped over 10 million
>> > iterations for benchmarking).
>> > Cheers!
>> Converting numbers to string involves the most expensive known
>> two operations : division and modulus by 10.
> No, IIRC few months or maybe years I have optimize this so it
> does not use division and modulus
It's using division and modulus, as expected:
If the compiler is smart enough, maybe it will replace this by
well known multiplication trick.
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