[PATCH] D104854: Introduce intrinsic llvm.isnan

[Serge Pavlov via Phabricator via llvm-commits]

sepavloff added a comment.

In D104854#2957423 <https://reviews.llvm.org/D104854#2957423>, @spatel wrote:

> Is it intentional that we are not canonicalizing the intrinsic call back to `fcmp uno` in the default FP environment?

It is lowered to unordered comparison by default. Changing `llvm.isnan` to  `fcmp uno` somewhere in IR would make it possible to optimize out the latter if fast-math mode is on. Preserving semantics of `isnan` when fast-math is in effect was one of the goals of this change.


Repository:
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  https://reviews.llvm.org/D104854/new/

https://reviews.llvm.org/D104854