[SelectionDAG] Move RegsForValue into SelectionDAGBuilder.h. NFC.

Summary:
The exported class will be used in later change, in
StatepointLowering.cpp.  It is still internal to SelectionDAG (not
exported via include/).

Reviewers: reames, atrick

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D9478

llvm-svn: 236554

1 files changed, 74 insertions, 0 deletions

diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h
index f3e52538607..72f82002e3d 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h
@@ -17,6 +17,7 @@
 #include "StatepointLowering.h"
 #include "llvm/ADT/APInt.h"
 #include "llvm/ADT/DenseMap.h"
+#include "llvm/CodeGen/Analysis.h"
 #include "llvm/CodeGen/SelectionDAG.h"
 #include "llvm/CodeGen/SelectionDAGNodes.h"
 #include "llvm/IR/CallSite.h"
@@ -879,6 +880,79 @@ private:
   void updateDAGForMaybeTailCall(SDValue MaybeTC);
 };
 
+/// RegsForValue - This struct represents the registers (physical or virtual)
+/// that a particular set of values is assigned, and the type information about
+/// the value. The most common situation is to represent one value at a time,
+/// but struct or array values are handled element-wise as multiple values.  The
+/// splitting of aggregates is performed recursively, so that we never have
+/// aggregate-typed registers. The values at this point do not necessarily have
+/// legal types, so each value may require one or more registers of some legal
+/// type.
+///
+struct RegsForValue {
+  /// ValueVTs - The value types of the values, which may not be legal, and
+  /// may need be promoted or synthesized from one or more registers.
+  ///
+  SmallVector<EVT, 4> ValueVTs;
+
+  /// RegVTs - The value types of the registers. This is the same size as
+  /// ValueVTs and it records, for each value, what the type of the assigned
+  /// register or registers are. (Individual values are never synthesized
+  /// from more than one type of register.)
+  ///
+  /// With virtual registers, the contents of RegVTs is redundant with TLI's
+  /// getRegisterType member function, however when with physical registers
+  /// it is necessary to have a separate record of the types.
+  ///
+  SmallVector<MVT, 4> RegVTs;
+
+  /// Regs - This list holds the registers assigned to the values.
+  /// Each legal or promoted value requires one register, and each
+  /// expanded value requires multiple registers.
+  ///
+  SmallVector<unsigned, 4> Regs;
+
+  RegsForValue();
+
+  RegsForValue(const SmallVector<unsigned, 4> &regs, MVT regvt, EVT valuevt);
+
+  RegsForValue(LLVMContext &Context, const TargetLowering &tli, unsigned Reg,
+               Type *Ty);
+
+  /// append - Add the specified values to this one.
+  void append(const RegsForValue &RHS) {
+    ValueVTs.append(RHS.ValueVTs.begin(), RHS.ValueVTs.end());
+    RegVTs.append(RHS.RegVTs.begin(), RHS.RegVTs.end());
+    Regs.append(RHS.Regs.begin(), RHS.Regs.end());
+  }
+
+  /// getCopyFromRegs - Emit a series of CopyFromReg nodes that copies from
+  /// this value and returns the result as a ValueVTs value.  This uses
+  /// Chain/Flag as the input and updates them for the output Chain/Flag.
+  /// If the Flag pointer is NULL, no flag is used.
+  SDValue getCopyFromRegs(SelectionDAG &DAG, FunctionLoweringInfo &FuncInfo,
+                          SDLoc dl,
+                          SDValue &Chain, SDValue *Flag,
+                          const Value *V = nullptr) const;
+
+  /// getCopyToRegs - Emit a series of CopyToReg nodes that copies the
+  /// specified value into the registers specified by this object.  This uses
+  /// Chain/Flag as the input and updates them for the output Chain/Flag.
+  /// If the Flag pointer is NULL, no flag is used.
+  void
+  getCopyToRegs(SDValue Val, SelectionDAG &DAG, SDLoc dl, SDValue &Chain,
+                SDValue *Flag, const Value *V,
+                ISD::NodeType PreferredExtendType = ISD::ANY_EXTEND) const;
+
+  /// AddInlineAsmOperands - Add this value to the specified inlineasm node
+  /// operand list.  This adds the code marker, matching input operand index
+  /// (if applicable), and includes the number of values added into it.
+  void AddInlineAsmOperands(unsigned Kind,
+                            bool HasMatching, unsigned MatchingIdx, SDLoc dl,
+                            SelectionDAG &DAG,
+                            std::vector<SDValue> &Ops) const;
+};
+
 } // end namespace llvm
 
 #endif