https://bugs.llvm.org/show_bug.cgi?id=35338
Bug ID: 35338
Summary: Clients of SelectionDAG::ReplaceAllUsesWith drop debug
info, & are inconsistent
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: Common Code Generator Code
Assignee: unassignedb...@nondot.org
Reporter: v...@apple.com
CC: llvm-bugs@lists.llvm.org
There are a few issues here:
- CombineTo() calls ReplaceAllUsesWith(), which calls transferDbgValues(). If
we assert that debug line/value information is preserved after the RAUW in
CombineTo(), a bunch of tests fail.
- Clients of transferDbgValues() pass it SDValues which are attached to SDNodes
with invalidated debug info. It seems unfortunate that we'd even try to
propagate invalid debug info.
- One overload of ReplaceAllUsesWith(From, To) requires From != To, but another
doesn't. This is partly annoying, but may also be masking correctness issues.
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