rjmccall added a comment. The reason we call FP contraction "fast" instead of "on" when it's cross-statement is because "on" is supposed to be consistent with the C language rules, whereas "fast" is stronger. There's no analogous situation with reassociation; I don't think the C standard is likely to ever bless reassociative FP math with an expression-local restriction. Steve, do you actually think that would be a useful optimization mode?
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