[PATCH] D143074: [LangRef] improve documentation of SNaN in the default FP environment

[Matt Arsenault via Phabricator via llvm-commits]

arsenm added a comment.

The snan problem is essentially the same as the question of whether denormals are flushed. We have llvm.canonicalize for stronger guarantees about flushing behavior than an arbitrary IR instruction. I think canonicalize should get a note that it musta quiet signaling nans.

APFloat also assumes new IEEE signaling representation. MIPS old style nans have to be all kinds of broken but I’m not sure how much we should really care


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  https://reviews.llvm.org/D143074/new/

https://reviews.llvm.org/D143074