[llvm-bugs] [Bug 48935] New: Exponential matcher traversal time for nested lambdas

via llvm-bugs llvm-bugs at lists.llvm.org
Fri Jan 29 01:18:25 PST 2021


            Bug ID: 48935
           Summary: Exponential matcher traversal time for nested lambdas
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Tooling
          Assignee: richard-llvm at metafoo.co.uk
          Reporter: sammccall at google.com
                CC: llvm-bugs at lists.llvm.org
            Blocks: 48902

This was introduced a few weeks before the 12 branch cut, by
c3a21e5de3dc3f55e4d219afd55dec518159d356, and took some time to track down.

It was fixed, but the fixed added its own regression, so we should probably
cherrypick both:
- 6f0df3cddb3e3f38df1baa7aa4d743a74bb46688 (contains the regression testcase)
- 43cc4f15008f8c700497d3d2b7020bfd29f5750f

Alternatives would be:
- revert the original change
- cherrypick only the first and live with the relatively mild regression

--> Richard for a decision (I'm confident we need to do *something* for the

Referenced Bugs:

[Bug 48902] [meta] 12.0.0 Release Blockers
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