https://bugs.llvm.org/show_bug.cgi?id=46808
Bug ID: 46808
Summary: RDF Live Variables Analysis may cause ballooning
compile times
Product: libraries
Version: trunk
Hardware: All
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: Common Code Generator Code
Assignee: unassignedb...@nondot.org
Reporter: scott.d.consta...@intel.com
CC: llvm-bugs@lists.llvm.org
The RDF live variables analysis probably has high asymptotic complexity than
what is actually necessary. In particular:
https://github.com/llvm/llvm-project/blob/b5be1c5419e2a38eb60fc7e785567b54b6d9e0e0/llvm/lib/CodeGen/RDFLiveness.cpp#L208
This may be causing substantial compilation overhead for some users who enable
passes that depend on RDF live variable analysis, e.g.,
https://github.com/rust-lang/rust/issues/74632.
Related discussion on llvm-dev:
http://lists.llvm.org/pipermail/llvm-dev/2020-April/141332.html.
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