[llvm] [NVPTX] Improve support for {ex2,lg2}.approx (PR #120519)

[Alex MacLean via llvm-commits]

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@@ -1193,6 +1213,8 @@ defm FNEG_H: F2_Support_Half<"neg", fneg>;
 
 defm FSQRT : F2<"sqrt.rn", fsqrt>;
 
+defm FEXP2_H: F2_Support_Half_2<"ex2.approx", fexp2>;
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AlexMaclean wrote:

Are the f16 and f16x2 variants needed? won't the Patterns in NVPTXIntrinsics.td already handle this?

https://github.com/llvm/llvm-project/pull/120519