[LLVMbugs] [Bug 11061] New: High optimization produces incorrect result

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=11061

           Summary: High optimization produces incorrect result
           Product: clang
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: release blocker
          Priority: P
         Component: C++
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: steven at ngls.net
                CC: llvmbugs at cs.uiuc.edu, dgregor at apple.com


The attached code produces incorrect results
when compiled with -O2 or -O3:


bluishred:~ 556 ? /usr/local/dev/Linux_x86_64/clang-trunk/bin/clang++ -O3
tclc.cpp -DWORKAROUND
bluishred:~ 557 ? ./a.out
nameMap.count( "" ): 0   should be zero!
nameMap.count( "" ): 0   should be zero!
nameMap.count( "" ): 0   should be zero!
bluishred:~ 558 ? /usr/local/dev/Linux_x86_64/clang-trunk/bin/clang++ -O3
tclc.cpp
bluishred:~ 559 ? ./a.out
nameMap.count( "" ): 0   should be zero!
nameMap.count( "" ): 1   should be zero!
nameMap.count( "" ): 1   should be zero!
bluishred:~ 560 ? /usr/local/dev/Linux_x86_64/clang-trunk/bin/clang++ -O2
tclc.cpp
bluishred:~ 561 ? ./a.out
nameMap.count( "" ): 0   should be zero!
nameMap.count( "" ): 1   should be zero!
nameMap.count( "" ): 1   should be zero!
bluishred:~ 562 ? /usr/local/dev/Linux_x86_64/clang-trunk/bin/clang++ -O1
tclc.cpp
bluishred:~ 563 ? ./a.out
nameMap.count( "" ): 0   should be zero!
nameMap.count( "" ): 0   should be zero!
nameMap.count( "" ): 0   should be zero!
bluishred:~ 564 ? /usr/local/dev/Linux_x86_64/clang-trunk/bin/clang++ -v
clang version 3.0 (trunk 140700)
Target: x86_64-unknown-linux-gnu
Thread model: posix

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