[Diffusion] rGb53d44fe4741: [EarlyCSE][ConstantFolding] add tests for atan/atan2; NFC

Wed Aug 10 09:10:54 PDT 2022

hubert.reinterpretcast added a comment.

In rGb53d44fe47413c87f619baf9e057f2a2e49d3998#1114269 <https://reviews.llvm.org/rGb53d44fe47413c87f619baf9e057f2a2e49d3998#1114269>, @mohammed-nurulhoque wrote:

>> POSIX does not require IEEE-754 conformance.
>
> POSIX (https://pubs.opengroup.org/onlinepubs/9699919799/functions/atan.html) also requires atan(-0.0) to be -0.0

That is not true: please pay attention to the meaning of the MX margin code: https://pubs.opengroup.org/onlinepubs/9699919799/help/codes.html#MX.

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  spatel (Committer)

https://reviews.llvm.org/rGb53d44fe4741