llvm dev - Apr 2016 - Inconsistency between datalayout description and implementation.

The LangRef states, for the alignments determined by datalayout:
> If no match is found, and the type sought is a vector type, then the
largest vector type
> that is smaller than the sought vector type will be used as a fall back.
This happens
> because <128 x double> can be implemented in terms of 64 <2 x
double>, for example.
However, the implementation only uses vector alignments from
datalayout if they match exactly.
If no exact match is found, "natural alignment" is used (align
next_power_of_2(size)).
A comment also states "This is consistent with what clang and llvm-gcc
do".

Is the implementation correct, and if so, should the LangRef be updated?

Thanks,
- eddyb