[clang] [llvm] [PowerPC] Add Support for BCDSHIFT, BCDSHIFTR, BCDTRUNC, BCDUTRUNC, and BCDUSHIFT instruction support (PR #154715)

[Lei Huang via cfe-commits]

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@@ -11151,6 +11161,20 @@ SDValue 
PPCTargetLowering::LowerINTRINSIC_WO_CHAIN(SDValue Op,
 
   SDLoc dl(Op);
 
+  // Lowers BCD intrinsics with rounding operand
+  auto MapNodeWithSplatVector = [&](unsigned Opcode) -> SDValue {
+    SDValue SplatVal =
+        DAG.getNode(ISD::SPLAT_VECTOR, dl, MVT::v4i32, Op.getOperand(2));
----------------
lei137 wrote:

Maybe I am missing something... this lowering function seems very basic... any 
reason why it couldn't of been done in the td files?

https://github.com/llvm/llvm-project/pull/154715
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