Another expansion for i64 multiply, suitable for PPC.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@43314 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp b/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
index 5998bc03f4edaf30589628da7adbcf1e584ad5da..23d132bb09e8a190e0dfaf36a521ddc7638eafd8 100644 (file)
--- a/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
+++ b/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
@@ -5930,6 +5930,15 @@ void SelectionDAGLegalize::ExpandOp(SDOperand Op, SDOperand &Lo, SDOperand &Hi){
         Hi = DAG.getNode(ISD::ADD, NVT, Hi, LH);
         break;
       }
+      if (HasMULHU) {
+        Lo = DAG.getNode(ISD::MUL, NVT, LL, RL);
+        Hi = DAG.getNode(ISD::MULHU, NVT, LL, RL);
+        RH = DAG.getNode(ISD::MUL, NVT, LL, RH);
+        LH = DAG.getNode(ISD::MUL, NVT, LH, RL);
+        Hi = DAG.getNode(ISD::ADD, NVT, Hi, RH);
+        Hi = DAG.getNode(ISD::ADD, NVT, Hi, LH);
+        break;
+      }
     }
 
     // If nothing else, we can make a libcall.