[PATCH] D78827: Add support for #pragma clang fp reassociate(fast|off) -- floating point control of associative math transformations

[John McCall via Phabricator via cfe-commits]

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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https://reviews.llvm.org/D78827