Didn't know this technique had a name, but I would think a modern compiler could make this optimization on its own, no?
No, it's not equivalent for floating point, so a compiler won't do it unless you do -fassociative-math (or a superset, such as -ffast-math), in which case all correctness bets are off.
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No, it's not equivalent for floating point, so a compiler won't do it unless you do -fassociative-math (or a superset, such as -ffast-math), in which case all correctness bets are off.