GCC internals: Where are fake dereferences removed?

The expression &ptr->fld doesn't represent a dereference, instead it should be treated as (uint32_t)ptr + offsetof (ptr, fld). I am certain that GCC does this simplification, but I cannot find where in the code.

The above ends up as ADDR_EXPR(COMPONENT_REF (INDIRECT_REF (ptr), fld)) in the AST, but at some point it should go through and simplify it. Having looked up almost every occurrence of ADDR_EXPR, COMPONENT_REF, and INDIRECT_REF in the gcc tree, I'm having tro开发者_高级运维uble discovering where. Any ideas?

Note that I've tried seeking out help from GCC people. In general they're pretty unhelpful, but people here may know the answer. If this is a bad question I'll understand if it's closed.

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Since you are already familiar with the AST of GCC, one way to find out would be to produce all tree and RTL dumps with gcc -fdump-tree-all -fdump-rtl-all and then do a binary search through them to localize the pass which does the transformmation.