Meinersbur added a comment.

In https://reviews.llvm.org/D48808#1149845, @hfinkel wrote:

> We specifically defined the metadata to support nested loops. The LangRef 
> says, "The llvm.mem.parallel_loop_access metadata refers to a loop 
> identifier, or metadata containing a list of loop identifiers for nested 
> loops." To handle nested loops, we need to make the instruction metadata 
> point to a list of loop IDs.


Thanks for pointing me to it. I've not seen parallel_loop_access pointing to a 
list, so I didn't know it was possible.


Repository:
  rC Clang

https://reviews.llvm.org/D48808



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