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This is a helper script to create llvm-mca tests that follow the style described in #173926 . That is, instead of putting both the input instructions and CHECK lines in the same file, we consolidate all input (files) into a single place, read by their `.test` files counterpart to check the per-processor results. The script added by this patch will enumerate each (`.s`) input files and create the corresponding `.test` file, parameterized by the provided `--triple` and `--cpu` options. Users also have the option to exclude certain input files or add additional `llvm-mca` / `FileCheck` arguments.
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