[clang] [compiler-rt] [llvm] [SystemZ] Add support for half (fp16) (PR #109164)

[Jonas Paulsson via llvm-commits]

================
@@ -6108,6 +6160,133 @@ static SDValue lowerAddrSpaceCast(SDValue Op, SelectionDAG &DAG) {
   return Op;
 }
 
+SDValue SystemZTargetLowering::LowerFP_EXTEND(SDValue Op,
+                                              SelectionDAG &DAG) const {
+  bool IsStrict = Op->isStrictFPOpcode();
+  SDValue In = Op.getOperand(IsStrict ? 1 : 0);
+  MVT VT = Op.getSimpleValueType();
+  MVT SVT = In.getSimpleValueType();
+  if (SVT != MVT::f16)
+    return Op;
+
+  SDLoc DL(Op);
+  SDValue Chain = IsStrict ? Op.getOperand(0) : SDValue();
+
+  // Need a libcall.  XXX factor out (below)
----------------
JonPsson1 wrote:

huh - you're right. ExpandNode() fails but it fall-through to ConvertNodeToLibcall().

https://github.com/llvm/llvm-project/pull/109164