R600: Add helper functions.

Extract these from some of my other patches, since this
is the only thing really making them dependent on each other.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@210627 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/R600/AMDGPUISelLowering.cpp

@@ -84,6 +84,25 @@ static bool allocateStack(unsigned ValNo, MVT ValVT, MVT LocVT,
 
 #include "AMDGPUGenCallingConv.inc"
 
+// Find a larger type to do a load / store of a vector with.
+EVT AMDGPUTargetLowering::getEquivalentMemType(LLVMContext &Ctx, EVT VT) {
+  unsigned StoreSize = VT.getStoreSizeInBits();
+  if (StoreSize <= 32)
+    return EVT::getIntegerVT(Ctx, StoreSize);
+
+  assert(StoreSize % 32 == 0 && "Store size not a multiple of 32");
+  return EVT::getVectorVT(Ctx, MVT::i32, StoreSize / 32);
+}
+
+// Type for a vector that will be loaded to.
+EVT AMDGPUTargetLowering::getEquivalentLoadRegType(LLVMContext &Ctx, EVT VT) {
+  unsigned StoreSize = VT.getStoreSizeInBits();
+  if (StoreSize <= 32)
+    return EVT::getIntegerVT(Ctx, 32);
+
+  return EVT::getVectorVT(Ctx, MVT::i32, StoreSize / 32);
+}
+
 AMDGPUTargetLowering::AMDGPUTargetLowering(TargetMachine &TM) :
   TargetLowering(TM, new TargetLoweringObjectFileELF()) {
 

lib/Target/R600/AMDGPUISelLowering.h

@@ -46,6 +46,8 @@ class AMDGPUTargetLowering : public TargetLowering {
   SDValue LowerUINT_TO_FP(SDValue Op, SelectionDAG &DAG) const;
 
 protected:
+  static EVT getEquivalentMemType(LLVMContext &Context, EVT VT);
+  static EVT getEquivalentLoadRegType(LLVMContext &Context, EVT VT);
 
   /// \brief Helper function that adds Reg to the LiveIn list of the DAG's
   /// MachineFunction.