[LLVMbugs] [Bug 298] NEW: Variable length array indexing miscompiled

bugzilla-daemon at cs.uiuc.edu bugzilla-daemon at cs.uiuc.edu
Wed Mar 17 13:21:37 PST 2004


           Summary: Variable length array indexing miscompiled
           Product: tools
           Version: 1.0
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: llvm-gcc
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: sabre at nondot.org

It looks like we are miscompiling indexes through C99 VLA's in some cases.  File
this into the "wow, I didn't know you could do that" catagory.  :)


int foo(int len, char arr[][len], int X) {
  return arr[X][0];

The correct addressing arithmetic to generate is "arr + X*len", which we don't
do in this case.


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