================
@@ -18410,6 +18410,24 @@ Value *CodeGenFunction::EmitAMDGPUBuiltinExpr(unsigned 
BuiltinID,
         CGM.getIntrinsic(Intrinsic::amdgcn_update_dpp, Args[0]->getType());
     return Builder.CreateCall(F, Args);
   }
+  case AMDGPU::BI__builtin_amdgcn_readlane:
+  case AMDGPU::BI__builtin_amdgcn_readfirstlane: {
----------------
arsenm wrote:

readfirstlane case can just call emitUnaryBuiltin. readlane can probably get 
away with emitBinaryBuiltin, although it doesn't quite fit the binary intrinsic 
signature 

https://github.com/llvm/llvm-project/pull/89217
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