[LLVMbugs] [Bug 10643] New: SplitBlock crash with incomplete dominator info

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=10643

           Summary: SplitBlock crash with incomplete dominator info
           Product: libraries
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Transformation Utilities
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: nick.sumner at gmail.com
                CC: llvmbugs at cs.uiuc.edu


Created an attachment (id=7059)
 --> (http://llvm.org/bugs/attachment.cgi?id=7059)
Patch against svn trunk

SplitBlock can cause an assertion failure when the current pass has stale or
incomplete dominator information. This is because it assumes that dominator
information is always present. I encountered this when using SplitBlock after
UnifyFunctionExitNodes.

The attached patch against the trunk fixes the problem for me and incidentally
fixes a whitespace bug in SplitBlock at the same time.

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