Last minute changes in https://reviews.llvm.org/D110908 unfortunately
introduced a bug wrt automatic pipeline expansion. This patch fixes that
as well as gets rid of a few redundant variables.
Reviewed By: aeubanks
Differential Revision: https://reviews.llvm.org/D113177
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
Sylvestre Ledru