[FPEnv] Strict versions of llvm.minimum/llvm.maximum

[uweigand]

Summary

Add new intrinsics llvm.experimental.constrained.minimum and llvm.experimental.constrained.maximum as strict versions of llvm.minimum and llvm.maximum. Includes SystemZ back-end support.

[craig.topper]

llvm/docs/LangRef.rst

16596

Should this refer to 754-2019 now?

[uweigand]

llvm/docs/LangRef.rst

16596

Well, I just copied the current wording from llvm.minimum. I guess we should use 754-2019 now; it looks like this was discussed in D67507 but the patch wasn't applied for some reasons ...

[kpn]

llvm/include/llvm/IR/ConstrainedOps.def

74

Adding this file has made new intrinsics so much easier. I'm almost irritated at how easy this was.

[craig.topper]

LGTM We can take the IEEE 754-2019 up as a separate issue.