Connie Zhu 18e55052d6
[mlir][polly][llvm-lit] Fixed logic for turning on external shell in lit (#106458)
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.
2024-08-30 09:21:13 -07:00
..

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.