[LLVMbugs] [Bug 5783] New: simplifylibcalls should constant fold strstr

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=5783

           Summary: simplifylibcalls should constant fold strstr
           Product: libraries
           Version: trunk
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Scalar Optimizations
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: clattner at apple.com
                CC: llvmbugs at cs.uiuc.edu, regehr at cs.utah.edu


One of the major things punishing clang on John Regehr's test is that clang
doesn't constant fold strstr, here's a trivial case:

const char *foo() {
  return strstr ("22.84.16 (Xaw toolkit)", "-cvs");
}

e.g.:
http://embed.cs.utah.edu/embarrassing/src_harvested_dec_09/077024.c


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