[LLVMbugs] [Bug 3346] New: Possible bug in linear scan allocator

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=3346

           Summary: Possible bug in linear scan allocator
           Product: libraries
           Version: trunk
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Register Allocator
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: resistor at mac.com
                CC: llvmbugs at cs.uiuc.edu


If you apply the attached patch to enable pre-alloc splitting with phi join
creation, telecom-FFT is miscompiled.  This occurs at iteration 5 of pre-alloc
splitting (-pre-split-limit=5).  However, looking at the diffs from
before/after that iteration, the transformation looks sounds.  Could this be a
bug later in codegen (regalloc?) that's being exposed?


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