[Issue 5282] Optimize array comparison which use memcmp to something better and remove unnecessary indirections.

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=5282


Vladimir Panteleev <thecybershadow at gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |thecybershadow at gmail.com


--- Comment #7 from Vladimir Panteleev <thecybershadow at gmail.com> 2013-04-02 00:50:30 EEST ---
I've written a patch to optimize the simple case of comparison of arrays of
basic types (integral and void[]), which was merged yesterday:

http://d.puremagic.com/issues/show_bug.cgi?id=9477
https://github.com/D-Programming-Language/dmd/pull/1766

It uses the memcmp intrinsic. DMD currently does not do anything special if the
array length is known at compile-time (i.e. at least one of the arrays is
static), but I imagine smarter backends might take advantage of that and unroll
it, as mentioned in comment #2.

It would be possible to expand it to structs, if someone could implement the
checks as described in comment #3.

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