[LLVMbugs] [Bug 18663] New: AggressiveAntiDepBreaker.cpp:574: bool llvm::AggressiveAntiDepBreaker::FindSuitableFreeRegisters(unsigned int, llvm::AggressiveAntiDepBreaker::RenameOrderType&, std::map<unsigned int, unsigned int>&): Assertion `IsSub && "Expecting group subregister"' fai

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=18663

            Bug ID: 18663
           Summary: AggressiveAntiDepBreaker.cpp:574: bool
                    llvm::AggressiveAntiDepBreaker::FindSuitableFreeRegist
                    ers(unsigned int,
                    llvm::AggressiveAntiDepBreaker::RenameOrderType&,
                    std::map<unsigned int, unsigned int>&): Assertion
                    `IsSub && "Expecting group subregister"' fai
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Common Code Generator Code
          Assignee: unassignedbugs at nondot.org
          Reporter: hfinkel at anl.gov
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Created attachment 11973
  --> http://llvm.org/bugs/attachment.cgi?id=11973&action=edit
bugpoint reduced test case

The aggressive anti-dep breaker fails on the attached (bugpoint-reduced) input:

llc -mcpu=a2 aab-ppc-a2-bugpoint-reduced-simplified.ll
AggressiveAntiDepBreaker.cpp:574: bool
llvm::AggressiveAntiDepBreaker::FindSuitableFreeRegisters(unsigned int,
llvm::AggressiveAntiDepBreaker::RenameOrderType&, std::map<unsigned int,
unsigned int>&): Assertion `IsSub && "Expecting group subregister"' failed.
...
2.    Running pass 'Post RA top-down list latency scheduler' on function
'@_ZN4Foam3CSVINS_6VectorIdEEE4readEv'

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