Another interesting difference

Kai Nacke kai at
Mon Dec 16 08:53:07 PST 2013

On Thursday, 12 December 2013 at 09:00:08 UTC, bearophile wrote:
> I am trying the following program with both the latest dmd 
> 2.065alpha and ldc2 2.063.2, with no optimizations:
> Do you know why ldc2 puts array bound tests inside fun()?

Yes! There was no check for this situation in ldc2. Bounds 
checking code was emitted for all array references. dmd 2.064 
omits the bounds checking code if the access can be checked at 
compile time. Therefore you see the difference.

I fixed this in the master and the merge-2.064 branch. The next 
release will include the fix.


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