[Issue 2356] array literal as non static initializer generates horribly inefficient code.

d-bugmail at puremagic.com d-bugmail at puremagic.com
Fri Oct 7 19:10:33 PDT 2011


http://d.puremagic.com/issues/show_bug.cgi?id=2356


dawg at dawgfoto.de changed:

           What    |Removed                     |Added
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                 CC|                            |dawg at dawgfoto.de


--- Comment #6 from dawg at dawgfoto.de 2011-10-07 19:09:44 PDT ---
This is also a huge issue when assigning .init to a static array.

ubyte[1024] v;
v = typeof(v).init;

This will generate a dynamically allocated [0, 0, 0 ... ] Arrayliteral for the
rhs expression before calling _d_arraycopy. Even worse the allocated
ArrayLiteral is initialized using 1024 comma expressions. Using -O the compiler
will subsequently almost starve from O(N^2) behavior during comsub
eliminations.

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