[SDAG] Merge multiple-result libcall expansion into DAG.expandMultipleResultFPLibCall() (#114792)

This merges the logic for expanding both FFREXP and FSINCOS into one
method `DAG.expandMultipleResultFPLibCall()`. This reduces duplication
and also allows FFREXP to benefit from the stack slot elimination
implemented for FSINCOS. This method will also be used in future to
implement more multiple-result intrinsics (such as modf and sincospi).

1 files changed, 5 insertions, 3 deletions

diff --git a/llvm/lib/CodeGen/SelectionDAG/LegalizeVectorOps.cpp b/llvm/lib/CodeGen/SelectionDAG/LegalizeVectorOps.cpp
index 8403c98..db21e70 100644
--- a/llvm/lib/CodeGen/SelectionDAG/LegalizeVectorOps.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/LegalizeVectorOps.cpp
@@ -1192,11 +1192,13 @@ void VectorLegalizer::Expand(SDNode *Node, SmallVectorImpl<SDValue> &Results) {
       return;
 
     break;
-  case ISD::FSINCOS:
-    if (DAG.expandFSINCOS(Node, Results))
+  case ISD::FSINCOS: {
+    RTLIB::Libcall LC =
+        RTLIB::getFSINCOS(Node->getValueType(0).getVectorElementType());
+    if (DAG.expandMultipleResultFPLibCall(LC, Node, Results))
       return;
-
     break;
+  }
   case ISD::VECTOR_COMPRESS:
     Results.push_back(TLI.expandVECTOR_COMPRESS(Node, DAG));
     return;