[llvm] [IR] Add `llvm.sincos` intrinsic (PR #109825)

[Simon Pilgrim via llvm-commits]

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@@ -3304,6 +3364,26 @@ SDValue DAGTypeLegalizer::SoftPromoteHalfRes_FFREXP(SDNode *N) {
   return DAG.getNode(GetPromotionOpcode(NVT, OVT), dl, MVT::i16, Res);
 }
 
+SDValue DAGTypeLegalizer::SoftPromoteHalfRes_FSINCOS(SDNode *N) {
+  EVT OVT = N->getValueType(0);
+  EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), OVT);
+  SDValue Op = GetSoftPromotedHalf(N->getOperand(0));
+  SDLoc dl(N);
+
+  // Promote to the larger FP type.
+  Op = DAG.getNode(GetPromotionOpcode(OVT, NVT), dl, NVT, Op);
+  SDValue Res = DAG.getNode(N->getOpcode(), dl, DAG.getVTList(NVT, NVT), Op);
+
+  // Convert back to FP16 as an integer.
+  ISD::NodeType Truncate = GetPromotionOpcode(NVT, OVT);
+  for (unsigned ResNum = 0; ResNum < N->getNumValues(); ResNum++) {
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RKSimon wrote:

(style) `for (unsigned ResNum = 0, NumValues = N->getNumValues(); ResNum < NumValues; ++ResNum)`


https://github.com/llvm/llvm-project/pull/109825