Forgot to add

llvm-svn: 75972

llvm/lib/Target/SystemZ/SystemZInstrBuilder.h

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+//===- SystemZInstrBuilder.h - Functions to aid building  insts -*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file exposes functions that may be used with BuildMI from the
+// MachineInstrBuilder.h file to handle SystemZ'isms in a clean way.
+//
+// The BuildMem function may be used with the BuildMI function to add entire
+// memory references in a single, typed, function call.
+//
+// For reference, the order of operands for memory references is:
+// (Operand), Base, Displacement, Index.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef SYSTEMZINSTRBUILDER_H
+#define SYSTEMZINSTRBUILDER_H
+
+#include "llvm/CodeGen/MachineFrameInfo.h"
+#include "llvm/CodeGen/MachineInstrBuilder.h"
+#include "llvm/CodeGen/PseudoSourceValue.h"
+
+namespace llvm {
+
+/// SystemZAddressMode - This struct holds a generalized full x86 address mode.
+/// The base register can be a frame index, which will eventually be replaced
+/// with R15 or R11 and Disp being offsetted accordingly.
+struct SystemZAddressMode {
+  enum {
+    RegBase,
+    FrameIndexBase
+  } BaseType;
+
+  union {
+    unsigned Reg;
+    int FrameIndex;
+  } Base;
+
+  unsigned IndexReg;
+  int32_t Disp;
+  GlobalValue *GV;
+
+  SystemZAddressMode() : BaseType(RegBase), IndexReg(0), Disp(0) {
+    Base.Reg = 0;
+  }
+};
+
+/// addDirectMem - This function is used to add a direct memory reference to the
+/// current instruction -- that is, a dereference of an address in a register,
+/// with no index or displacement.
+///
+static inline const MachineInstrBuilder &
+addDirectMem(const MachineInstrBuilder &MIB, unsigned Reg) {
+  // Because memory references are always represented with 3
+  // values, this adds: Reg, [0, NoReg] to the instruction.
+  return MIB.addReg(Reg).addImm(0).addReg(0);
+}
+
+static inline const MachineInstrBuilder &
+addOffset(const MachineInstrBuilder &MIB, int Offset) {
+  return MIB.addImm(Offset).addReg(0);
+}
+
+/// addRegOffset - This function is used to add a memory reference of the form
+/// [Reg + Offset], i.e., one with no or index, but with a
+/// displacement. An example is: 10(%r15).
+///
+static inline const MachineInstrBuilder &
+addRegOffset(const MachineInstrBuilder &MIB,
+             unsigned Reg, bool isKill, int Offset) {
+  return addOffset(MIB.addReg(Reg, getKillRegState(isKill)), Offset);
+}
+
+/// addRegReg - This function is used to add a memory reference of the form:
+/// [Reg + Reg].
+static inline const MachineInstrBuilder &
+addRegReg(const MachineInstrBuilder &MIB,
+            unsigned Reg1, bool isKill1, unsigned Reg2, bool isKill2) {
+  return MIB.addReg(Reg1, getKillRegState(isKill1)).addImm(0)
+    .addReg(Reg2, getKillRegState(isKill2));
+}
+
+static inline const MachineInstrBuilder &
+addFullAddress(const MachineInstrBuilder &MIB, const SystemZAddressMode &AM) {
+  if (AM.BaseType == SystemZAddressMode::RegBase)
+    MIB.addReg(AM.Base.Reg);
+  else if (AM.BaseType == SystemZAddressMode::FrameIndexBase)
+    MIB.addFrameIndex(AM.Base.FrameIndex);
+  else
+    assert(0);
+
+  MIB.addImm(AM.Disp).addReg(AM.IndexReg);
+}
+
+/// addFrameReference - This function is used to add a reference to the base of
+/// an abstract object on the stack frame of the current function.  This
+/// reference has base register as the FrameIndex offset until it is resolved.
+/// This allows a constant offset to be specified as well...
+///
+static inline const MachineInstrBuilder &
+addFrameReference(const MachineInstrBuilder &MIB, int FI, int Offset = 0) {
+  MachineInstr *MI = MIB;
+  MachineFunction &MF = *MI->getParent()->getParent();
+  MachineFrameInfo &MFI = *MF.getFrameInfo();
+  const TargetInstrDesc &TID = MI->getDesc();
+  unsigned Flags = 0;
+  if (TID.mayLoad())
+    Flags |= MachineMemOperand::MOLoad;
+  if (TID.mayStore())
+    Flags |= MachineMemOperand::MOStore;
+  MachineMemOperand MMO(PseudoSourceValue::getFixedStack(FI),
+                        Flags,
+                        MFI.getObjectOffset(FI) + Offset,
+                        MFI.getObjectSize(FI),
+                        MFI.getObjectAlignment(FI));
+  return addOffset(MIB.addFrameIndex(FI), Offset)
+            .addMemOperand(MMO);
+}
+
+} // End llvm namespace
+
+#endif