http://d.puremagic.com/issues/show_bug.cgi?id=7442



--- Comment #7 from Dmitry Olshansky <dmitry.o...@gmail.com> 2012-04-17 
04:26:21 PDT ---
I investigated this further and conclude that there are 2 factors at work.

I removed few thousands of codepoints from Letter, so it doesn't run out of RAM
outright.(see code below)
Also separated parse from build steps.

Here are collected stats on CTFE.

parse only:

        ---- CTFE Performance ----
max call depth = 20     max stack = 44
array allocs = 2761     assignments = 430837

build:
        ---- CTFE Performance ----
max call depth = 20     max stack = 73
array allocs = 8264     assignments = 1293421

Parsing creates all the datastructures for unicode table machinery
it takes slightly less then half of all allocs already.
Another thing to notice is it fetures higher allocations per assigment.

Then comes the codegen step and it's CTFE only and far more alloc happy. 
Frankly I see no way to reduce all of this alloc fun because of COW
that will ruin any attempt to preallocate buffer for generated code. 
Am I right that arrays do dup on every write?

--- test program ---

import std.regex;
void main(){
    version(parse)
        static r = regex(set);
    else //build
        static r = ctRegex!set;
}

enum set =
`[A-Za-z\u00AA\u00B5\u00BA\u00C0-\u00D6\u00D8-\u00F6\u00F8-\u02C1\u02C6-\u02D1\u02E0-\u02E4\u02EC\u02EE\u0370-\u0374\u0376\u0377
\u037A-\u037D\u0386\u0388-\u038A\u038C\u038E-\u03A1\u03A3-\u03F5\u03F7-\u0481\u048A-\u0527\u0531-\u0556\u0559\u0561-\u0587\u05D0-\u05EA
\u05F0-\u05F2\u0620-\u064A\u066E\u066F\u0671-\u06D3\u06D5\u06E5\u06E6\u06EE\u06EF\u06FA-\u06FC\u06FF\u0710\u0712-\u072F\u074D-\u07A5
\u07B1\u07CA-\u07EA\u07F4\u07F5\u07FA\u0800-\u0815\u081A\u0824\u0828\u0840-\u0858\u08A0\u08A2-\u08AC\u0904-\u0939\u093D\u0950\u0958-\u0961
\u0971-\u0977\u0979-\u097F\u0985-\u098C\u098F\u0990\u0993-\u09A8\u09AA-\u09B0\u09B2\u09B6-\u09B9\u09BD\u09CE\u09DC\u09DD\u09DF-\u09E1
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\u0E94-\u0E97\u0E99-\u0E9F\u0EA1-\u0EA3\u0EA5\u0EA7\u0EAA\u0EAB\u0EAD-\u0EB0\u0EB2\u0EB3\u0EBD\u0EC0-\u0EC4\u0EC6\u0EDC-\u0EDF
\u0F00\u0F40-\u0F47\u0F49-\u0F6C\u0F88-\u0F8C\u1000-\u102A\u103F\u1050-\u1055\u105A-\u105D\u1061\u1065\u1066\u106E-\u1070\u1075-\u1081
\u108E\u10A0-\u10C5\u10C7\u10CD\u10D0-\u10FA\u10FC-\u1248\u124A-\u124D\u1250-\u1256\u1258\u125A-\u125D\u1260-\u1288\u128A-\u128D
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\u1401-\u166C\u166F-\u167F\u1681-\u169A\u16A0-\u16EA\u1700-\u170C\u170E-\u1711\u1720-\u1731\u1740-\u1751\u1760-\u176C\u176E-\u1770\u1780-\u17B3
\u17D7\u17DC\u1820-\u1877\u1880-\u18A8\u18AA\u18B0-\u18F5\u1900-\u191C\u1950-\u196D\u1970-\u1974\u1980-\u19AB\u19C1-\u19C7\u1A00-\u1A16\u1A20-\u1A54
\u1AA7\u1B05-\u1B33\u1B45-\u1B4B\u1B83-\u1BA0\u1BAE\u1BAF\u1BBA-\u1BE5\u1C00-\u1C23\u1C4D-\u1C4F\u1C5A-\u1C7D\u1CE9-\u1CEC\u1CEE-\u1CF1\u1CF5\u1CF6
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\u1FC6-\u1FCC\u1FD0-\u1FD3\u1FD6-\u1FDB\u1FE0-\u1FEC\u1FF2-\u1FF4\u1FF6-\u1FFC\u2071\u207F\u2090-\u209C\u2102\u2107\u210A-\u2113\u2115\u2119-\u211D\u2124
\u2126\u2128\u212A-\u212D\u212F-\u2139\u213C-\u213F\u2145-\u2149\u214E\u2183\u2184\u2C00-\u2C2E\u2C30-\u2C5E\u2C60-\u2CE4\u2CEB-\u2CEE\u2CF2
\u2CF3\u2D00-\u2D25\u2D27\u2D2D\u2D30-\u2D67\u2D6F\u2D80-\u2D96\u2DA0-\u2DA6\u2DA8-\u2DAE\u2DB0-\u2DB6\u2DB8-\u2DBE\u2DC0-\u2DC6\u2DC8-\u2DCE
\u2DD0-\u2DD6\u2DD8-\u2DDE\u2E2F\u3005\u3006\u3031-\u3035\u303B\u303C\u3041-\u3096\u309D-\u309F\u30A1-\u30FA\u30FC-\u30FF\u3105-\u312D\u3131-\u318E
\u31A0-\u31BA\u31F0-\u31FF\u3400-\u4DB5\u4E00-\u9FCC\uA000-\uA48C\uA4D0-\uA4FD\uA500-\uA60C\uA610-\uA61F\uA62A\uA62B\uA640-\uA66E\uA67F-\uA697\uA6A0-\uA6E5
\uA717-\uA71F\uA722-\uA788\uA78B-\uA78E\uA790-\uA793\uA7A0-\uA7AA\uA7F8-\uA801\uA803-\uA805\uA807-\uA80A\uA80C-\uA822\uA840-\uA873\uA882-\uA8B3\uA8F2-\uA8F7
\uA8FB\uA90A-\uA925\uA930-\uA946\uA960-\uA97C\uA984-\uA9B2\uA9CF\uAA00-\uAA28\uAA40-\uAA42\uAA44-\uAA4B\uAA60-\uAA76\uAA7A\uAA80-\uAAAF\uAAB1\uAAB5
\uAAB6\uAAB9-\uAABD\uAAC0\uAAC2\uAADB-\uAADD\uAAE0-\uAAEA\uAAF2-\uAAF4\uAB01-\uAB06\uAB09-\uAB0E\uAB11-\uAB16\uAB20-\uAB26\uAB28-\uAB2E\uABC0-\uABE2
\uAC00-\uD7A3\uD7B0-\uD7C6\uD7CB-\uD7FB\uF900-\uFA6D\uFA70-\uFAD9\uFB00-\uFB06\uFB13-\uFB17\uFB1D\uFB1F-\uFB28\uFB2A-\uFB36\uFB38-\uFB3C\uFB3E\uFB40
\uFB41\uFB43\uFB44\uFB46-\uFBB1\uFBD3-\uFD3D\uFD50-\uFD8F\uFD92-\uFDC7\uFDF0-\uFDFB\uFE70-\uFE74\uFE76-\uFEFC\uFF21-\uFF3A\uFF41-\uFF5A\uFF66-\uFFBE
\uFFC2-\uFFC7\uFFCA-\uFFCF\uFFD2-\uFFD7\uFFDA-\uFFDC\U00010000-\U0001000B\U0001000D-\U00010026\U00010028-\U0001003A\U0001003C\U0001003D\U0001003F-\U0001004D
\U00010050-\U0001005D\U00010080-\U000100FA\U00010280-\U0001029C\U000102A0-\U000102D0\U00010300-\U0001031E\U00010330-\U00010340\U00010342-\U00010349\U00010380-\U0001039D
\U000103A0-\U000103C3\U000103C8-\U000103CF\U00010400-\U0001049D\U00010800-\U00010805\U00010808\U0001080A-\U00010835\U00010837\U00010838\U0001083C\U0001083F-\U00010855
\U00010900-\U00010915\U00010920-\U00010939\U00010980-\U000109B7\U000109BE\U000109BF\U00010A00\U00010A10-\U00010A13\U00010A15-\U00010A17\U00010A19-\U00010A33
\U00010A60-\U00010A7C\U00010B00-\U00010B35\U00010B40-\U00010B55\U00010B60-\U00010B72\U00010C00-\U00010C48\U00011003-\U00011037\U00011083-\U000110AF
\U000110D0-\U000110E8\U00011103-\U00011126\U00011183-\U000111B2\U000111C1-\U000111C4\U00011680-\U000116AA\U00012000-\U0001236E\U00013000-\U0001342E\U00016800-\U00016A38
\U00016F00-\U00016F44\U00016F50\U00016F93-\U00016F9F\U0001B000\U0001B001\U0001D400-\U0001D454\U0001D456-\U0001D49C\U0001D49E\U0001D49F\U0001D4A2\U0001D4A5\U0001D4A6\U0001D4A9-\U0001D4AC
\U0001D4AE-\U0001D4B9\U0001D4BB\U0001D4BD-\U0001D4C3\U0001D4C5-\U0001D505\U0001D507-\U0001D50A\U0001D50D-\U0001D514\U0001D516-\U0001D51C\U0001D51E-\U0001D539\U0001D53B-\U0001D53E
\U0001D540-\U0001D544\U0001D546\U0001D54A-\U0001D550\U0001D552-\U0001D6A5\U0001D6A8-\U0001D6C0\U0001D6C2-\U0001D6DA\U0001D6DC-\U0001D6FA\U0001D6FC-\U0001D714
\U0001D716-\U0001D734\U0001D736-\U0001D74E\U0001D750-\U0001D76E\U0001D770-\U0001D788\U0001D78A-\U0001D7A8\U0001D7AA-\U0001D7C2\U0001D7C4-\U0001D7CB
\U0001EE00-\U0001EE03\U0001EE05-\U0001EE1F\U0001EE21\U0001EE22\U0001EE24\U0001EE27\U0001EE29-\U0001EE32\U0001EE34-\U0001EE37\U0001EE39\U0001EE3B\U0001EE42
\U0001EEA1-\U0001EEA3\U0001EEA5-\U0001EEA9\U0001EEAB-\U0001EEBB\U00020000-\U0002A6D6\U0002A700-\U0002B734\U0002B740-\U0002B81D\U0002F800-\U0002FA1D]`;

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