lib/Target/PowerPC/PPCInstrBuilder.h

   1 //===-- PPCInstrBuilder.h - Aides for building PPC insts --------*- C++ -*-===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file was developed by the LLVM research group and is distributed under
   6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // This file exposes functions that may be used with BuildMI from the
  11 // MachineInstrBuilder.h file to simplify generating frame and constant pool
  12 // references.
  13 //
  14 // For reference, the order of operands for memory references is:
  15 // (Operand), Dest Reg, Base Reg, and either Reg Index or Immediate
  16 // Displacement.
  17 //
  18 //===----------------------------------------------------------------------===//
  19
  20 #ifndef POWERPC_INSTRBUILDER_H
  21 #define POWERPC_INSTRBUILDER_H
  22
  23 #include "llvm/CodeGen/MachineInstrBuilder.h"
  24
  25 namespace llvm {
  26
  27 /// addFrameReference - This function is used to add a reference to the base of
  28 /// an abstract object on the stack frame of the current function.  This
  29 /// reference has base register as the FrameIndex offset until it is resolved.
  30 /// This allows a constant offset to be specified as well...
  31 ///
  32 inline const MachineInstrBuilder&
  33 addFrameReference(const MachineInstrBuilder &MIB, int FI, int Offset = 0,
  34                   bool mem = true) {
  35   if (mem)
  36     return MIB.addSImm(Offset).addFrameIndex(FI);
  37   else
  38     return MIB.addFrameIndex(FI).addSImm(Offset);
  39 }
  40
  41 /// addConstantPoolReference - This function is used to add a reference to the
  42 /// base of a constant value spilled to the per-function constant pool.  The
  43 /// reference has base register ConstantPoolIndex offset which is retained until
  44 /// either machine code emission or assembly output.  This allows an optional
  45 /// offset to be added as well.
  46 ///
  47 inline const MachineInstrBuilder&
  48 addConstantPoolReference(const MachineInstrBuilder &MIB, unsigned CPI,
  49                          int Offset = 0) {
  50   return MIB.addSImm(Offset).addConstantPoolIndex(CPI);
  51 }
  52
  53 } // End llvm namespace
  54
  55 #endif