llvm-project

Commit Graph

Author	SHA1	Message	Date
Max Kazantsev	f8a42bca28	[ADCE] Fix incorrect reporting of CFG changes This patch fixes 2 related bugs in ADCE: - `performDeadCodeElimination` does not report changes if it did ONLY CFG changes (affects both old and new pass managers); - When control flow removal is enabled, new pass manager does not drop CFG analyses. Both can lead to incorrect loop info after ADCE that does only CFG changes. Differential Revision: https://reviews.llvm.org/D78103 Reviewed By: Denis Antrushin	2020-04-14 20:26:13 +07:00
Max Kazantsev	2c4d914eeb	[Test] Add failing test that demonstrates buggy behavior of ADCE ADCE messes up with loop info (proved for new pass manager only) by making some loop blocks unreachable, without making proper updates to the loop.	2020-04-14 18:47:04 +07:00

Author

SHA1

Message

Date

Max Kazantsev

f8a42bca28

[ADCE] Fix incorrect reporting of CFG changes

This patch fixes 2 related bugs in ADCE:
- `performDeadCodeElimination` does not report changes if it did ONLY
  CFG changes (affects both old and new pass managers);
- When control flow removal is enabled, new pass manager does not
  drop CFG analyses.

Both can lead to incorrect loop info after ADCE that does only CFG changes.

Differential Revision: https://reviews.llvm.org/D78103
Reviewed By: Denis Antrushin

2020-04-14 20:26:13 +07:00

Max Kazantsev

2c4d914eeb

[Test] Add failing test that demonstrates buggy behavior of ADCE

ADCE messes up with loop info (proved for new pass manager only) by
making some loop blocks unreachable, without making proper updates
to the loop.

2020-04-14 18:47:04 +07:00

2 Commits