https://bugs.llvm.org/show_bug.cgi?id=44128
Bug ID: 44128
Summary: Abnormal amount of time spent in SelectionDAG::Combine
Product: libraries
Version: 9.0
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Backend: X86
Assignee: unassignedb...@nondot.org
Reporter: jonasschiev...@gmail.com
CC: craig.top...@gmail.com, llvm-bugs@lists.llvm.org,
llvm-...@redking.me.uk, spatel+l...@rotateright.com
Created attachment 22860
--> https://bugs.llvm.org/attachment.cgi?id=22860&action=edit
Reproduction - run with `llc llvm.ll`
The attached LLVM IR (generated by rustc) makes llc spend an unexpectedly long
time (minutes) in SelectionDAG::Combine.
Upstream issue: https://github.com/rust-lang/rust/issues/66595
The IR isn't fully minimized yet, but the file is only a couple dozen lines
regardless.
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