lib/Target/TargetInstrInfo.cpp

   1 //===-- TargetInstrInfo.cpp - Target Instruction Information --------------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // This file implements the TargetInstrInfo class.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "llvm/Target/TargetInstrInfo.h"
  15 #include "llvm/Target/TargetRegisterInfo.h"
  16 #include "llvm/Constant.h"
  17 #include "llvm/DerivedTypes.h"
  18 using namespace llvm;
  19
  20 TargetInstrInfo::TargetInstrInfo(const TargetInstrDesc* Desc,
  21                                  unsigned numOpcodes)
  22   : Descriptors(Desc), NumOpcodes(numOpcodes) {
  23 }
  24
  25 TargetInstrInfo::~TargetInstrInfo() {
  26 }
  27
  28 bool TargetInstrInfo::isUnpredicatedTerminator(const MachineInstr *MI) const {
  29   const TargetInstrDesc &TID = MI->getDesc();
  30   if (!TID.isTerminator()) return false;
  31
  32   // Conditional branch is a special case.
  33   if (TID.isBranch() && !TID.isBarrier())
  34     return true;
  35   if (!TID.isPredicable())
  36     return true;
  37   return !isPredicated(MI);
  38 }
  39
  40 /// getInstrOperandRegClass - Return register class of the operand of an
  41 /// instruction of the specified TargetInstrDesc.
  42 const TargetRegisterClass*
  43 llvm::getInstrOperandRegClass(const TargetRegisterInfo *TRI,
  44                         const TargetInstrDesc &II, unsigned Op) {
  45   if (Op >= II.getNumOperands())
  46     return NULL;
  47   if (II.OpInfo[Op].isLookupPtrRegClass())
  48     return TRI->getPointerRegClass();
  49   return TRI->getRegClass(II.OpInfo[Op].RegClass);
  50 }