[Issue 2396] -O causes very long execution time on foreach loop of large array of structs

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=2396


Don <clugdbug at yahoo.com.au> changed:

           What    |Removed                     |Added
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                 CC|                            |clugdbug at yahoo.com.au


--- Comment #4 from Don <clugdbug at yahoo.com.au> 2011-06-23 03:41:47 PDT ---
On DMD2.053 and later, the literal needs to be declared with 'enum' rather than
'static const' to expose the bug.

It's slow because in this case, there is a single expression consisting of
14013 comma expressions, and several places in the backend use algorithms which
are in O(commadepth ^^ 2).
One of the slowest is accumrd() in gflow.c. 

There is also something slow in loopopt(), boolopt() and in builddags().

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