[LLVMbugs] [Bug 967] NEW: [predsimplify] release run works fine, debug run goes crazy

bugzilla-daemon at cs.uiuc.edu bugzilla-daemon at cs.uiuc.edu
Wed Oct 25 14:36:01 PDT 2006


           Summary: [predsimplify] release run works fine, debug run goes
           Product: libraries
           Version: trunk
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Scalar Optimizations
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: sabre at nondot.org

This is a nasty bug that points to some memory corruption issue or something.

time ~/llvm/Release/bin/opt -predsimplify -disable-output bugpoint-reduced-simplified.bc 
0.055u 0.009s 0:00.06 83.3%     0+0k 0+1io 0pf+0w

time ~/llvm/Debug/bin/opt -predsimplify -disable-output bugpoint-reduced-simplified.bc 

Note that the .bc *does* have a large nasty cfg, but it is strange that this issue should only affect a 
debug opt and not a release opt.  This points to some memory clobbering, or deleting something, but 
not removing it from a map or something (i.e. it's address is still the key or value of some map).

I'm disabling predsimplify in llvm-gcc until this is resolved, this breaks debug bootstraps on both ppc 
and x86.


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