[PATCH] D127964: [DCE] Eliminate no-op atan and atan2 calls

[Serge Pavlov via Phabricator via llvm-commits]

sepavloff added a comment.

The opengroup specification (https://pubs.opengroup.org/onlinepubs/9699919799/functions/atan.html) states:

  If x is subnormal, a range error may occur

It does not state that `error shall occur`, which means this behavior is optional. So constant evaluation hardly needs changes.


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https://reviews.llvm.org/D127964