[LLVMdev] IRBuilder and "ad hoc" optimizations

[Paweł Bylica]

Hi LLVM,

IRBuilder can fold constants (that behaviour can be controlled by Folder
type). What do you think about optionally allow IRBuilder to eliminate
no-op instructions like `add %a, 0` or `memcpy(%a, %b, 0)`?

- Paweł
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