[LLVMbugs] [Bug 914] NEW: quantum_toffoli in 462.libquantum compiles to really bad code with llc

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=914

           Summary: quantum_toffoli in 462.libquantum compiles to really bad
                    code with llc
           Product: libraries
           Version: 1.0
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: minor
          Priority: P2
         Component: Backend: X86
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: sabre at nondot.org


The X86 backend produces significantly slower (2.5x) code for the quantum_toffoli than the C backend.  

Code layout seems to be a major contributing factor, but also there are a number of 64-bit shifts that we 
may be codegen'ing poorly or something.

-Chris



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