[LLVMbugs] [Bug 9454] New: clang wrong code bug

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=9454

           Summary: clang wrong code bug
           Product: new-bugs
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: regehr at cs.utah.edu
                CC: llvmbugs at cs.uiuc.edu


[regehr at gamow ~]$ clang -v
clang version 3.0 (trunk 127456)
Target: x86_64-unknown-linux-gnu
Thread model: posix
[regehr at gamow ~]$ clang -O0 small.c -o small
[regehr at gamow ~]$ ./small 
g_331 = 1
[regehr at gamow ~]$ clang -O1 small.c -o small
[regehr at gamow ~]$ ./small 
g_331 = 2
[regehr at gamow ~]$ cat small.c
int g_34 = 1;
static int g_331;

int printf(const char *format, ...);

int main (int argc, char* argv[])
{
    g_331 = 1 + ((g_34 & 2) == g_34);
    printf("g_331 = %d\n", g_331);
    return 0;
}

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