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<p>it is natural to think that there is only one index, the selection of the
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field <tt>F</tt>. However, in this example, <tt>Foo</tt> is a pointer. That
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pointer must be indexed explicitly in LLVM. C, on the other hand, indexs
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through it ransparently. To arrive at the same address location as the C
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through it transparently. To arrive at the same address location as the C
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code, you would provide the GEP instruction with two index operands. The
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first operand indexes through the pointer; the second operand indexes the
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field <tt>F</tt> of the structure, just as if you wrote:</p>
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