[llvm] [NVPTX] Support llvm.{exp2, log2} for f32 and vector of f32 (PR #120519)

[Princeton Ferro via llvm-commits]

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@@ -968,7 +968,8 @@ NVPTXTargetLowering::NVPTXTargetLowering(const NVPTXTargetMachine &TM,
   setOperationAction(ISD::CopyToReg, MVT::i128, Custom);
   setOperationAction(ISD::CopyFromReg, MVT::i128, Custom);
 
-  // No FEXP2, FLOG2.  The PTX ex2 and log2 functions are always approximate.
+  setOperationAction(ISD::FEXP2, MVT::f32, Legal);
+  // No FLOG2. The PTX log2 function is always approximate.
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Prince781 wrote:

Added `log2`.

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