X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FCodeGen%2FTargetInstrInfoImpl.cpp;h=ff9c129994eb79713544fee6886f7d2e592069c7;hb=6fa1c051dc515b6fd1f9a26ac12fed985469bff5;hp=cd2bfcce0232b872c09ce9a0bef851eb4744c5a6;hpb=749c6f6b5ed301c84aac562e414486549d7b98eb;p=oota-llvm.git

diff --git a/lib/CodeGen/TargetInstrInfoImpl.cpp b/lib/CodeGen/TargetInstrInfoImpl.cpp
index cd2bfcce023..ff9c129994e 100644
--- a/lib/CodeGen/TargetInstrInfoImpl.cpp
+++ b/lib/CodeGen/TargetInstrInfoImpl.cpp
@@ -14,17 +14,39 @@
 
 #include "llvm/Target/TargetInstrInfo.h"
 #include "llvm/CodeGen/MachineInstr.h"
+#include "llvm/CodeGen/MachineInstrBuilder.h"
 using namespace llvm;
 
 // commuteInstruction - The default implementation of this method just exchanges
 // operand 1 and 2.
-MachineInstr *TargetInstrInfoImpl::commuteInstruction(MachineInstr *MI) const {
+MachineInstr *TargetInstrInfoImpl::commuteInstruction(MachineInstr *MI,
+                                                      bool NewMI) const {
   assert(MI->getOperand(1).isRegister() && MI->getOperand(2).isRegister() &&
          "This only knows how to commute register operands so far");
   unsigned Reg1 = MI->getOperand(1).getReg();
   unsigned Reg2 = MI->getOperand(2).getReg();
   bool Reg1IsKill = MI->getOperand(1).isKill();
   bool Reg2IsKill = MI->getOperand(2).isKill();
+  bool ChangeReg0 = false;
+  if (MI->getOperand(0).getReg() == Reg1) {
+    // Must be two address instruction!
+    assert(MI->getDesc().getOperandConstraint(0, TOI::TIED_TO) &&
+           "Expecting a two-address instruction!");
+    Reg2IsKill = false;
+    ChangeReg0 = true;
+  }
+
+  if (NewMI) {
+    // Create a new instruction.
+    unsigned Reg0 = ChangeReg0 ? Reg2 : MI->getOperand(0).getReg();
+    bool Reg0IsDead = MI->getOperand(0).isDead();
+    return BuildMI(MI->getDesc()).addReg(Reg0, true, false, false, Reg0IsDead)
+      .addReg(Reg2, false, false, Reg2IsKill)
+      .addReg(Reg1, false, false, Reg1IsKill);
+  }
+
+  if (ChangeReg0)
+    MI->getOperand(0).setReg(Reg2);
   MI->getOperand(2).setReg(Reg1);
   MI->getOperand(1).setReg(Reg2);
   MI->getOperand(2).setIsKill(Reg1IsKill);
@@ -32,8 +54,28 @@ MachineInstr *TargetInstrInfoImpl::commuteInstruction(MachineInstr *MI) const {
   return MI;
 }
 
+/// CommuteChangesDestination - Return true if commuting the specified
+/// instruction will also changes the destination operand. Also return the
+/// current operand index of the would be new destination register by
+/// reference. This can happen when the commutable instruction is also a
+/// two-address instruction.
+bool TargetInstrInfoImpl::CommuteChangesDestination(MachineInstr *MI,
+                                                    unsigned &OpIdx) const{
+  assert(MI->getOperand(1).isRegister() && MI->getOperand(2).isRegister() &&
+         "This only knows how to commute register operands so far");
+  if (MI->getOperand(0).getReg() == MI->getOperand(1).getReg()) {
+    // Must be two address instruction!
+    assert(MI->getDesc().getOperandConstraint(0, TOI::TIED_TO) &&
+           "Expecting a two-address instruction!");
+    OpIdx = 2;
+    return true;
+  }
+  return false;
+}
+
+
 bool TargetInstrInfoImpl::PredicateInstruction(MachineInstr *MI,
-                                               const std::vector<MachineOperand> &Pred) const {
+                                const std::vector<MachineOperand> &Pred) const {
   bool MadeChange = false;
   const TargetInstrDesc &TID = MI->getDesc();
   if (!TID.isPredicable())
@@ -57,3 +99,24 @@ bool TargetInstrInfoImpl::PredicateInstruction(MachineInstr *MI,
   }
   return MadeChange;
 }
+
+void TargetInstrInfoImpl::reMaterialize(MachineBasicBlock &MBB,
+                                        MachineBasicBlock::iterator I,
+                                        unsigned DestReg,
+                                        const MachineInstr *Orig) const {
+  MachineInstr *MI = Orig->clone();
+  MI->getOperand(0).setReg(DestReg);
+  MBB.insert(I, MI);
+}
+
+unsigned
+TargetInstrInfoImpl::GetFunctionSizeInBytes(const MachineFunction &MF) const {
+  unsigned FnSize = 0;
+  for (MachineFunction::const_iterator MBBI = MF.begin(), E = MF.end();
+       MBBI != E; ++MBBI) {
+    const MachineBasicBlock &MBB = *MBBI;
+    for (MachineBasicBlock::const_iterator I = MBB.begin(),E = MBB.end(); I != E; ++I)
+      FnSize += GetInstSizeInBytes(I);
+  }
+  return FnSize;
+}