tree 82860063b14bf23ab72e6ceb0fd53bb87dfb8e3a
parent 31c8332b716dcb3b49496f8cabda703dcfa927cf
author Markus Lavin <markus.lavin@ericsson.com> 1633502917 +0200
committer Copybara-Service <copybara-worker@google.com> 1633504625 -0700

[NPM] Automatic 'opt' pipeline reducer script.

Script for automatic 'opt' pipeline reduction for when using the new
pass-manager (NPM). Based around the '-print-pipeline-passes' option.

The reduction algorithm consists of several phases (steps).

Step #0: Verify that input fails with the given pipeline and make note of the
error code.

Step #1: Split pipeline in two starting from front and move forward as long as
first pipeline exits normally and the second pipeline fails with the expected
error code. Move on to step #2 with the IR from the split point and the
pipeline from the second invocation.

Step #2: Remove passes from end of the pipeline as long as the pipeline fails
with the expected error code.

Step #3: Make several sweeps over the remaining pipeline trying to remove one
pass at a time. Repeat sweeps until unable to remove any more passes.

Usage example:
./utils/reduce_pipeline.py --opt-binary=./build-all-Debug/bin/opt --input=input.ll --output=output.ll --passes=PIPELINE [EXTRA-OPT-ARGS ...]

Differential Revision: https://reviews.llvm.org/D110908

GitOrigin-RevId: 91d15aa0b8bff10bd1ccf279418560d17fea52ff