[Issue 11017] New: std.string/uni.toLower is very slow

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=11017

           Summary: std.string/uni.toLower is very slow
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Phobos
        AssignedTo: nobody at puremagic.com
        ReportedBy: peter.alexander.au at gmail.com


--- Comment #0 from Peter Alexander <peter.alexander.au at gmail.com> 2013-09-12 10:52:33 PDT ---
char[] s = new char[10_000_000];
s[] = 'A';
auto s2 = s.toLower;

This takes 4.3 seconds on my machine.


char[] s = new char[10_000_000];
s[] = 'A';
auto s2 = s.map!toLower.to!string;

This only takes 1.1 seconds.

Looking at the code for std.uni.toLower, it appears the string is constructed
using repeated ~=. It should use an Appender of some sort.

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