[LLVMbugs] [Bug 3321] New: incorrect optimisation of linked list code

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=3321

           Summary: incorrect optimisation of linked list code
           Product: libraries
           Version: 2.4
          Platform: PC
        OS/Version: Windows XP
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Interprocedural Optimizations
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: jay.foad at antixlabs.com
                CC: llvmbugs at cs.uiuc.edu


Created an attachment (id=2385)
 --> (http://llvm.org/bugs/attachment.cgi?id=2385)
source file

The attached program should return 42. But if I build it with llvm-gcc on
Linux/x86, I get non-deterministic results:

$ ~/llvm/llvm-gcc4.2-2.4-x86-linux-RHEL4/bin/llvm-gcc -O2 -o f f.c
$ ./f ; echo $?
212
$ ./f ; echo $?
164
$ ./f ; echo $?
212
$ ./f ; echo $?
180

It looks like the optimizers have replaced all my code with "ret i32 undef".


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