[LLVMbugs] [Bug 9879] New: SelectionDAGBuilder does not preserve debug information attached to phi nodes

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=9879

           Summary: SelectionDAGBuilder does not preserve debug
                    information attached to phi nodes
           Product: libraries
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: release blocker
          Priority: P
         Component: Common Code Generator Code
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: micah.villmow at amd.com
                CC: llvmbugs at cs.uiuc.edu


Created an attachment (id=6562)
 --> (http://llvm.org/bugs/attachment.cgi?id=6562)
bitcode file that causes debug information to get dropped.

The attached bitcode file looses debug information when it is run through any
backend. The variables gid and tid do not show up in the dwarf information and
are dropped in the function visitIntrinsicCall when visiting a
Instrinsic::dbg_value node that is referencing a PHINode.

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