[llvm-bugs] [Bug 34992] New: Fatal error: Offset not zero at the point of scalar access

via llvm-bugs llvm-bugs at lists.llvm.org
Wed Oct 18 10:18:46 PDT 2017


            Bug ID: 34992
           Summary: Fatal error: Offset not zero at the point of scalar
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: douglas_yung at playstation.sony.com
                CC: llvm-bugs at lists.llvm.org

Following r315984, one of our internal tests started to fail with the following
error from the compiler:

Offset not zero at the point of scalar access
  %2 = load float, float* %india, align 4, !tbaa !6
!6 = !{!7, !9, i64 4}
fatal error: error in backend: Broken function found, compilation aborted!

You can reproduce this by compiling the following code with optimization’s

Clang -cc1 -emit-obj -O2 reduced.cpp

Where reduced.cpp is the following code:

/* reduced.cpp */
class alpha;
namespace bravo {
  namespace charlie { 
    void delta(alpha* element, char* name, float var); 

  namespace foxtrot {
    class gulf { public: float hotel; float india; };
    class juliet { public: gulf kilo[4]; };

  namespace charlie {
    class lima { public: bravo::foxtrot::juliet mike; };
    void november( alpha* oscar, lima * papa ) {
      alpha* quebec ;
      delta(quebec, "romeo", papa->mike.kilo->india);

Thanks to Sunil for helping reduce this test for me.

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