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This results in a 3.08% performance increase in one of my real life workloads. I was using the
EnumIter
expansion, but there's no reason any of the other expansions shouldn't have the attribute (except formatting functions, as inlining those is generally bad practice, especially error displaying and debug-formatting). For iterators especially, and even more so in a hot hot loop like in my case, not inlining the iterator can be devastating. Note that not even fat LTO saved me in this case which I'm already using.