[llvm-bugs] [Bug 26845] New: crash of llvm-diff (Assertion `!Result && "structural differences second time around?"' failed)

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=26845

            Bug ID: 26845
           Summary: crash of llvm-diff (Assertion `!Result && "structural
                    differences second time around?"' failed)
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: chengniansun at gmail.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

When I apply llvm-diff to the attached two bc files(t.c_003.bc and temp.bc),
llvm-diff crashes. 


$: llvm-diff-trunk t.c_003.bc temp.bc 
in function platform_main_end:
  in block %entry:
    in instruction store to %crc.addr / store to %crc.addr:
      operands %crc.addr and %crc.addr differ
llvm-diff-trunk:
/tmp/llvm-builder/llvm-source-trunk/tools/llvm-diff/DifferenceEngine.cpp:179:
void {anonymous}::FunctionDifferenceEngine::unify(llvm::Instruction*,
llvm::Instruction*): Assertion `!Result && "structural differences second time
around?"' failed.
Aborted (core dumped)
$: 
$: clang-trunk -v
clang version 3.9.0 (trunk 262593)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/bin
Found candidate GCC installation: /usr/bin/../lib/gcc/i686-linux-gnu/5.3.0
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/4.8
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/4.8.5
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/4.9
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/4.9.3
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/5.3.0
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/5.3.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8.5
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9.3
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.3.0
Selected GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/4.9
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Candidate multilib: x32;@mx32
Selected multilib: .;@m64
$: 
$: llvm-diff-trunk -version
LLVM (http://llvm.org/):
  LLVM version 3.9.0svn
  Optimized build with assertions.
  Built Mar  3 2016 (01:23:18).
  Default target: x86_64-unknown-linux-gnu
  Host CPU: nehalem
$:

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