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...re selected to be special loads and stores that > do some transform from a canonical form in memory to a type-specific > form in register. > 2) Because bitcasts are load/store pairs in semantic, they must > behave as if a store then load was done. Specifically (bitcast TyA to > TyB) must transform TyA -> canonical form -> TyB, as a store then load > would. Therefore bitcasts are not no-ops during code generation (*but > behave as if they are from an IR perspective!*). > > The reason this works neatly in IR is due to the IR's type system. In > order...

...pecial loads and stores that > > do some transform from a canonical form in memory to a type-specific > > form in register. > > 2) Because bitcasts are load/store pairs in semantic, they must > > behave as if a store then load was done. Specifically (bitcast TyA > > to TyB) must transform TyA -> canonical form -> TyB, as a store then > > load would. Therefore bitcasts are not no-ops during code generation > > (*but behave as if they are from an IR perspective!*). > > > > > > The reason this works neatly in IR is due to the IR's...

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> Ok. Then we need to change the LangRef as suggested. Given this is a rather important semantic change, I think you need to send a top level RFC to the list. FWIW, I don't think this is a semantic change to LLVM-IR itself. I think it's more clearing up the misconception that LLVM-IR semantics also apply to SelectionDAG's operations. That said, I do think it's important to

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