[llvm-bugs] [Bug 25337] New: false positive: unitilization after switch

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=25337

            Bug ID: 25337
           Summary: false positive: unitilization after switch
           Product: clang
           Version: 3.7
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Static Analyzer
          Assignee: kremenek at apple.com
          Reporter: dushistov at gmail.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

For such code:
int f(unsigned val)
{
        int res;
        switch ((val & 1)) {
        case 0: res = 1; break;
        case 1: res = 2; break;
        }
        return res;
}

clang static analyser (3.7) return "Undefined or garbage value returned to
caller", but this is not true because of (val & 1) can produce only 0 or 1, so
all possible branches handled in switch, and res will contain not garbage.

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