[llvm-commits] [patch] Define a canonical order for the pairs in the range metadata

[Rafael Espíndola]

While working on PR12979 I found it useful to assume that the
intervals in the range metadata to be in a canonical order. This patch
enforces them to be non-overlapping, non-contiguous and sorted by the
lower end (signed comparison).

While this can be seen as a minor backward incompatibility, all
frontends produce IL with only one interval in the range metadata and
I am currently implementing the first case where we will merge two
ranges, so I don't think it would actually reject any existing
bitcode.

Cheers,
Rafael
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