[LLVMbugs] [Bug 1353] NEW: Code generator needs DominatorTree

bugzilla-daemon at cs.uiuc.edu bugzilla-daemon at cs.uiuc.edu
Tue Apr 24 15:29:08 PDT 2007


           Summary: Code generator needs DominatorTree
           Product: libraries
           Version: trunk
          Platform: Macintosh
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: Common Code Generator Code
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: sabre at nondot.org

Various bits of the code generator need dominator information.  The register allocator wants loop depth to 
compute spill weight, and future phi elimination stuff need dominator information.  Currently we look 
back at the LLVM CFG, but this doesn't work well for multiple reasons (there is a many to one mapping 
from llvm bb to MBBs, MBB edges can get deleted, etc).


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