[LLVMbugs] [Bug 7615] New: GVN doesn't update AliasAnalysis correctly

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Fri Jul 9 13:38:55 PDT 2010


           Summary: GVN doesn't update AliasAnalysis correctly
           Product: new-bugs
           Version: 2.7
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: willdtz at gmail.com
                CC: llvmbugs at cs.uiuc.edu

Created an attachment (id=5200)
 --> (http://llvm.org/bugs/attachment.cgi?id=5200)
Test case (for dejagnu/lit style) demonstrating the issue

GVN queries the AliasAnalysis on values that didn't exist when the AA was
executed.  This causes all stateful AA's to break (aka any that actually
compute their results in runOn*).  The "debug-aa" pass in mainline helps catch
these -- attached is a testcase demonstrating an example demonstrating this.

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