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-# Pass bisection
-
-This document describes a feature for the bisection tool, which provides
-pass and transformation level bisection for a bad object file.
-
-Before reading this document, please refer to README.bisect for general usage
-of the bisection tool.
-
-The benefit of using pass level bisection is:
-When building a bad object file, it can tell you which pass and transformation
-in the compiler caused the error.
-
-*Notice:* This tool will only work for LLVM/clang, since it is using options
-`-opt-bisect-limit` and `print-debug-counter` that only exist in LLVM.
-
-## Arguments
-
-All the required arguments in object-file-level bisection tool are still
-to be provided. In addition, you will need to add the following arguments:
-
-1. `--pass_bisect`: enables pass level bisection
-2. `--ir_diff`: enables output of IR differences
-
-Please refer to `--help` or the examples below for details about how to use
-them.
-
-## HOW TO USE: ChromeOS
-
-*TODO* - Future work: Currently this only works for Android.
-
-## HOW TO USE: Android
-
-1.  Prerequisites: A general setup is still needed for Android, which means that
-    you need to populate good and bad set of objects with two versions of
-    compilers.
-
-    See the documentation in `README.bisect.md` for more detailed instructions.
-
-1.  Pass/Transformation Bisection: If you do not wish to override the other
-    arguments, this command should be sufficient to do pass/transformation level
-    bisection:
-
-    ```
-    ./bisect.py android PATH_TO_ANDROID_HOME_DIR
-                --pass_bisect=’android/generate_cmd.sh’
-                --prune=False
-                --ir_diff
-                --verbose
-    ```
-
-    Where:
-
-    ```
-    --pass_bisect:
-        Enables pass/transformation level bisection and with default
-        script to generate the command as ‘android/generate_cmd.sh’.
-    --prune:
-        For now, prune must be set to False to return only the first
-        bad item.
-    --ir_diff:
-        Optional argument to print out IR differences.
-    --verbose:
-        To show IR diff, verbose needs to be on.
-    ```
-
-    Other default arguments:
-
-    ```
-    --get_initial_items='android/get_initial_items.sh'
-    --switch_to_good='android/switch_to_good.sh'
-    --switch_to_bad='android/switch_to_bad.sh'
-    --test_setup_script='android/test_setup.sh'
-    --test_script='android/interactive_test.sh'
-    --incremental
-    --prune
-    --file_args
-    ```
-
-    You can always override them if needed. See README.bisect for more
-    details.
-
-1.  Other features: Features such as resuming, number of jobs, and device id
-    remain the same as before. See README.bisect for more details.