[LLVMbugs] [Bug 21315] New: Garbage value false positive when counting with modulus

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Mon Oct 20 09:03:20 PDT 2014


            Bug ID: 21315
           Summary: Garbage value false positive when counting with
           Product: clang
           Version: trunk
          Hardware: Macintosh
                OS: MacOS X
            Status: NEW
          Severity: normal
          Priority: P
         Component: Static Analyzer
          Assignee: kremenek at apple.com
          Reporter: bryceco at yahoo.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Created attachment 13224
  --> http://llvm.org/bugs/attachment.cgi?id=13224&action=edit
test case

When iterating through an array beginning at an offset and wrapping around the
analyzer doesn't recognize which values are accessed. In the attached code all
array values but "skip" are initialized but the analyzer gives a "undefined
value" false positive when summing the elements.

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