Johannes Doerfert b1b441d22d [Attributor] Use abstract call sites to determine associated arguments ...

This is the second step after D67871 to make use of abstract call sites.
In this patch the argument we associate with a abstract call site
argument can be the one in the callback callee instead of the one in the
callback broker.

Caveat: We cannot allow no-alias arguments for problematic callbacks:
As described in [1], adding no-alias (or restrict) to arguments could
break synchronization as the synchronization effect, e.g., a barrier,
does not "alias" with the pointer anymore. This disables no-alias
annotation for potentially problematic arguments until we implement the
fix described in [1].

Reviewed By: uenoku

Differential Revision: https://reviews.llvm.org/D68008

[1] Compiler Optimizations for OpenMP, J. Doerfert and H. Finkel,
    International Workshop on OpenMP 2018,
    http://compilers.cs.uni-saarland.de/people/doerfert/par_opt18.pdf

2019-12-31 01:33:22 -06:00

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