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6629a96a8c
If a combined loop has insufficient parallelism (= low trip count), we might end up with too few teams/blocks. To counter that we can reduce the number of threads per team we use. This patch implements a heuristic and exposes a new environment variable to control the minimum of threads to be employed in this case. Issue reported by: Felipe Cabarcas Jaramillo <cabarcas@udel.edu> (@fel-cab). Reviewed By: tianshilei1992 Differential Revision: https://reviews.llvm.org/D152014