[LLVMbugs] [Bug 6651] New: slow register coalescing

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=6651

           Summary: slow register coalescing
           Product: libraries
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Common Code Generator Code
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: rafael.espindola at gmail.com
                CC: llvmbugs at cs.uiuc.edu


The attached testcase takes 91.2377s in llc. Most of the time is in

 65.8001 ( 72.3%)   0.0440 ( 19.0%)  65.8441 ( 72.2%)  65.9472 ( 72.2%)  Simple
Register Coalescing
  15.9610 ( 17.5%)   0.0080 (  3.4%)  15.9690 ( 17.5%)  15.9948 ( 17.5%) 
Machine Common Subexpression Elimination
   7.0564 (  7.8%)   0.0880 ( 37.9%)   7.1444 (  7.8%)   7.1505 (  7.8%)  X86
DAG->DAG Instruction Selection

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