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18e55052d6
For both mlir and polly, the lit internal shell is the default shell for running lit tests. However, if the user wanted to switch back to the external shell by setting `LIT_USE_INTERNAL_SHELL=0`, the `not` used in the body of the `if` conditional changes `use_lit_shell` to be True instead of the intended False. Removing `not` allows for this lit config to work as intended. Fixes https://github.com/llvm/llvm-project/issues/106459.
Polly - Polyhedral optimizations for LLVM ----------------------------------------- http://polly.llvm.org/ Polly uses a mathematical representation, the polyhedral model, to represent and transform loops and other control flow structures. Using an abstract representation it is possible to reason about transformations in a more general way and to use highly optimized linear programming libraries to figure out the optimal loop structure. These transformations can be used to do constant propagation through arrays, remove dead loop iterations, optimize loops for cache locality, optimize arrays, apply advanced automatic parallelization, drive vectorization, or they can be used to do software pipelining.