[LLVMbugs] [Bug 908] NEW: LICM crash, "Uses remain whena value is destroyed"

bugzilla-daemon at cs.uiuc.edu bugzilla-daemon at cs.uiuc.edu
Tue Sep 12 08:08:21 PDT 2006


           Summary: LICM crash, "Uses remain whena value is destroyed"
           Product: libraries
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Loop Optimizer
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: nicholas at mxc.ca

MultiSource/Applications/oggenc picked up a failure in the nightly run. It
appears to be in the loop invariant code motion pass. Here's what happens:

$ ~/llvm/Debug/bin/opt -licm bugpoint-reduced-simplified.bc
WARNING: You're attempting to print out a bytecode file.
This is inadvisable as it may cause display problems. If
you REALLY want to taste LLVM bytecode first-hand, you
can force output with the `-f' option.

While deleting: uint %tmp16.i
Use still stuck around after Def is destroyed:  %exitcond155 = seteq uint 0,
%tmp16.i           ; <bool> [#uses=0]

opt: Value.cpp:59: virtual llvm::Value::~Value(): Assertion `use_begin() ==
use_end() && "Uses remain when a value is destroyed!"' failed.

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