Extended Description

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}
4
fatal error: error in backend: Broken function found, compilation aborted!

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

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.