add a new CreateStackTemporary helper method.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42994 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 17 insertions, 0 deletions

diff --git a/include/llvm/CodeGen/SelectionDAG.h b/include/llvm/CodeGen/SelectionDAG.h
index 0120e99c8b..aef63d6edc 100644
--- a/include/llvm/CodeGen/SelectionDAG.h
+++ b/include/llvm/CodeGen/SelectionDAG.h
@@ -492,6 +492,10 @@ public:
 
   void dump() const;
 
+  /// CreateStackTemporary - Create a stack temporary, suitable for holding the
+  /// specified value type.
+  SDOperand CreateStackTemporary(MVT::ValueType VT);
+  
   /// FoldSetCC - Constant fold a setcc to true or false.
   SDOperand FoldSetCC(MVT::ValueType VT, SDOperand N1,
                       SDOperand N2, ISD::CondCode Cond);
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
index 9a1ea7cb38..b1b3bd4fb8 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@@ -19,6 +19,7 @@
 #include "llvm/Assembly/Writer.h"
 #include "llvm/CodeGen/MachineBasicBlock.h"
 #include "llvm/CodeGen/MachineConstantPool.h"
+#include "llvm/CodeGen/MachineFrameInfo.h"
 #include "llvm/Support/MathExtras.h"
 #include "llvm/Target/MRegisterInfo.h"
 #include "llvm/Target/TargetData.h"
@@ -913,6 +914,18 @@ SDOperand SelectionDAG::getSrcValue(const Value *V, int Offset) {
   return SDOperand(N, 0);
 }
 
+/// CreateStackTemporary - Create a stack temporary, suitable for holding the
+/// specified value type.
+SDOperand SelectionDAG::CreateStackTemporary(MVT::ValueType VT) {
+  MachineFrameInfo *FrameInfo = getMachineFunction().getFrameInfo();
+  unsigned ByteSize = MVT::getSizeInBits(VT)/8;
+  const Type *Ty = MVT::getTypeForValueType(VT);
+  unsigned StackAlign = (unsigned)TLI.getTargetData()->getPrefTypeAlignment(Ty);
+  int FrameIdx = FrameInfo->CreateStackObject(ByteSize, StackAlign);
+  return getFrameIndex(FrameIdx, TLI.getPointerTy());
+}
+
+
 SDOperand SelectionDAG::FoldSetCC(MVT::ValueType VT, SDOperand N1,
                                   SDOperand N2, ISD::CondCode Cond) {
   // These setcc operations always fold.