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Hi, On LLVM 5.0 (current trunk), fadd/fsub and fmul that are both marked with `contract` or `fast` can be merged to a fma instruction by the backend. I'm wondering about the exact semantic of this new flag as well as `fast` and in particular, would it be valid to do this when only the `fadd`/`fsub` (and not the `fmul`) is marked with `contract` or at least `fast`. The reasoning is that doing