add a new CreateStackTemporary helper method.

llvm-svn: 42994

1 files changed, 13 insertions, 0 deletions

diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
index 9a1ea7cb386..b1b3bd4fb85 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ b/llvm/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.