[LLVMbugs] [Bug 13458] New: UNREACHABLE in X86InstrInfo executed with "atomicrmw max" instruction

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=13458

             Bug #: 13458
           Summary: UNREACHABLE in X86InstrInfo executed with "atomicrmw
                    max" instruction
           Product: new-bugs
           Version: unspecified
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: matt at pharr.org
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified


Created attachment 8944
  --> http://llvm.org/bugs/attachment.cgi?id=8944
test case

With the attached test case, which is basically just a single "atomicrmw max",
I get the following crash with top-of-tree:

% llc bugpoint-reduced-simplified.ll -o /dev/null
Cannot emit physreg copy instruction
UNREACHABLE executed at X86InstrInfo.cpp:2868!
[...]
0.    Program arguments: llc bugpoint-reduced-simplified.ll -o /dev/null 
1.    Running pass 'Function Pass Manager' on module
'bugpoint-reduced-simplified.ll'.
2.    Running pass 'Post-RA pseudo instruction expansion pass' on function
'@MergeStats'

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