[LLVMbugs] [Bug 21238] New: Insufficient Lazy Value Info calculation loses jump threading opportunity

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=21238

            Bug ID: 21238
           Summary: Insufficient Lazy Value Info calculation loses jump
                    threading opportunity
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Global Analyses
          Assignee: unassignedbugs at nondot.org
          Reporter: liujiangning1 at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Created attachment 13183
  --> http://llvm.org/bugs/attachment.cgi?id=13183&action=edit
A test to expose missing jump-threading optimization

For attached test case, LVI(Lazy Value Info) calculation is too conservative,
and it causes llvm fail to capture jump-threading opportunity.

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