[llvm] [RISCV][GISel] Add support for G_IS_FPCLASS in F and D extensions (PR #72000)

[via llvm-commits]

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@@ -948,6 +952,30 @@ bool RISCVInstructionSelector::selectFPCompare(MachineInstr &MI,
   return true;
 }
 
+bool RISCVInstructionSelector::selectIsFPClass(MachineInstr &MI,
+                                               MachineIRBuilder &MIB,
+                                               MachineRegisterInfo &MRI) const {
+  Register CheckResult = MI.getOperand(0).getReg();
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tschuett wrote:

Would a `GISFPLASS` simplify the code?

https://github.com/llvm/llvm-project/pull/72000