[llvm-commits] [llvm] r136001 - /llvm/trunk/lib/Target/X86/X86ISelLowering.cpp

[Bruno Cardoso Lopes]

Author: bruno
Date: Mon Jul 25 18:05:16 2011
New Revision: 136001

URL: http://llvm.org/viewvc/llvm-project?rev=136001&view=rev
Log:
Reintroduce r135730, this is indeed the right approach, there is no
native 256-bit vector instruction to do scalar_to_vector.

Modified:
    llvm/trunk/lib/Target/X86/X86ISelLowering.cpp

Modified: llvm/trunk/lib/Target/X86/X86ISelLowering.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/X86/X86ISelLowering.cpp?rev=136001&r1=136000&r2=136001&view=diff
==============================================================================
--- llvm/trunk/lib/Target/X86/X86ISelLowering.cpp (original)
+++ llvm/trunk/lib/Target/X86/X86ISelLowering.cpp Mon Jul 25 18:05:16 2011
@@ -983,6 +983,7 @@
       setOperationAction(ISD::VECTOR_SHUFFLE,     SVT, Custom);
       setOperationAction(ISD::INSERT_VECTOR_ELT,  SVT, Custom);
       setOperationAction(ISD::EXTRACT_VECTOR_ELT, SVT, Custom);
+      setOperationAction(ISD::SCALAR_TO_VECTOR,   SVT, Custom);
       setOperationAction(ISD::INSERT_SUBVECTOR,   SVT, Custom);
     }
 
@@ -6324,9 +6325,26 @@
 
 SDValue
 X86TargetLowering::LowerSCALAR_TO_VECTOR(SDValue Op, SelectionDAG &DAG) const {
+  LLVMContext *Context = DAG.getContext();
   DebugLoc dl = Op.getDebugLoc();
   EVT OpVT = Op.getValueType();
 
+  // If this is a 256-bit vector result, first insert into a 128-bit
+  // vector and then insert into the 256-bit vector.
+  if (OpVT.getSizeInBits() > 128) {
+    // Insert into a 128-bit vector.
+    EVT VT128 = EVT::getVectorVT(*Context,
+                                 OpVT.getVectorElementType(),
+                                 OpVT.getVectorNumElements() / 2);
+
+    Op = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, VT128, Op.getOperand(0));
+
+    // Insert the 128-bit vector.
+    return Insert128BitVector(DAG.getNode(ISD::UNDEF, dl, OpVT), Op,
+                              DAG.getConstant(0, MVT::i32),
+                              DAG, dl);
+  }
+
   if (Op.getValueType() == MVT::v1i64 &&
       Op.getOperand(0).getValueType() == MVT::i64)
     return DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, MVT::v1i64, Op.getOperand(0));