The nested loop now enforces multithreading.
Switches are added to support controlling whether multithreading is used to nested loops The reason for adding a parameter to control whether to enable multithreaded nested loop is that 1. Provides parameters for fast execution of single-threaded versus multithreaded comparisons 2. At present, the physical layer is placed in the second stage because the multi-threaded transformation of Nested loop has not been thoroughly carried out during the development period. The argument that controls turning on multithreading is also needed for easy code rollback TODO: There is no time to continue to optimize this parameter, later need to provide a configurable parameter to control whether to enable multithreading
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