[llvm] [KnownFPClass] Add dynamic and FTPZ|DAPZ denormal-mode tests for negative subnormal inputs (PR #219091)

[via llvm-commits]

ZERICO2005 wrote:

I have updated this PR so that I am only adding tests to functions that currently do not have any known denormal mode handling bugs.

All the functions that currently have denormal mode handling bugs will have the relevant denormal mode tests added in their respective PRs.

https://github.com/llvm/llvm-project/pull/219091