release mode optimization
Ali Çehreli
acehreli at yahoo.com
Thu Jan 10 08:41:19 PST 2013
On 01/09/2013 04:14 PM, Charles Hixson wrote:
> Would the following code:
> for (int i = 1; i < di.count; i++)
> { assert (node.di.entry[i - 1].key < node.di.entry[i].key); }
>
> be optimized away if compiled under -release?
It looks like you can use std.algorithm.isSorted instead:
http://dlang.org/phobos/std_algorithm.html#isSorted
assert(isSorted(di));
Or perhaps:
assert(isSorted(node.di.entry[0 .. di.count]));
That code will disappear in release mode.
Additionally, if the O(N) complexity of that check is not acceptable
even in non-release mode there is std.range.assumeSorted:
http://dlang.org/phobos/std_range.html#.assumeSorted
assumeSorted makes very few comparisons so it may miss occasional sort
issues. Also, it is not really for checking but more for range
algorithms that require or work better with a sorted range.
Ali
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