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

[Mohammed Nurul Hoque via Phabricator via llvm-commits]

mohammed-nurulhoque added a comment.

In D127964#3591112 <https://reviews.llvm.org/D127964#3591112>, @sepavloff wrote:

> 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.

Yes. But before this patch, it doesn't consider any atan* call as No-Op, which means it's assuming all atan* as potentially failing.
This patch strictly limits the cases where an error might be expected


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