[llvm-bugs] [Bug 38779] [DebugInfo at O2][Dexter] Incorrect variable valuations reported from loop

via llvm-bugs llvm-bugs at lists.llvm.org
Tue Jun 18 01:39:07 PDT 2019


Jeremy Morse <jeremy.morse.llvm at gmail.com> changed:

           What    |Removed                     |Added
         Resolution|---                         |DUPLICATE
             Status|CONFIRMED                   |RESOLVED

--- Comment #3 from Jeremy Morse <jeremy.morse.llvm at gmail.com> ---
Looking before-and-after livedebugvalues in recent clang, the DBG_VALUE
assigning "sum" the value zero, is unsoundly propagated into the loop body from
the preheader / entry block, after which we get the weird variable location
behaviour. This is definitely the "livedebugvalues ignores backedges" problem
in bug 38997.

*** This bug has been marked as a duplicate of bug 38997 ***

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