1 files changed, 111 insertions, 0 deletions
diff --git a/llvm/lib/Target/PowerPC/PPCInstrInfo.cpp b/llvm/lib/Target/PowerPC/PPCInstrInfo.cpp
new file mode 100644
index 00000000000..314b7481263
--- /dev/null
+++ b/llvm/lib/Target/PowerPC/PPCInstrInfo.cpp
@@ -0,0 +1,111 @@
+//===- PPC32InstrInfo.cpp - PowerPC32 Instruction Information ---*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file was developed by the LLVM research group and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains the PowerPC implementation of the TargetInstrInfo class.
+//
+//===----------------------------------------------------------------------===//
+
+#include "PPCInstrInfo.h"
+#include "PPCGenInstrInfo.inc"
+#include "PPC.h"
+#include "llvm/CodeGen/MachineInstrBuilder.h"
+#include <iostream>
+using namespace llvm;
+
+PPC32InstrInfo::PPC32InstrInfo()
+  : TargetInstrInfo(PPCInsts, sizeof(PPCInsts)/sizeof(PPCInsts[0])) {}
+
+bool PPC32InstrInfo::isMoveInstr(const MachineInstr& MI,
+                                 unsigned& sourceReg,
+                                 unsigned& destReg) const {
+  MachineOpCode oc = MI.getOpcode();
+  if (oc == PPC::OR) {                      // or r1, r2, r2
+    assert(MI.getNumOperands() == 3 &&
+           MI.getOperand(0).isRegister() &&
+           MI.getOperand(1).isRegister() &&
+           MI.getOperand(2).isRegister() &&
+           "invalid PPC OR instruction!");
+    if (MI.getOperand(1).getReg() == MI.getOperand(2).getReg()) {
+      sourceReg = MI.getOperand(1).getReg();
+      destReg = MI.getOperand(0).getReg();
+      return true;
+    }
+  } else if (oc == PPC::ADDI) {             // addi r1, r2, 0
+    assert(MI.getNumOperands() == 3 &&
+           MI.getOperand(0).isRegister() &&
+           MI.getOperand(2).isImmediate() &&
+           "invalid PPC ADDI instruction!");
+    if (MI.getOperand(1).isRegister() && MI.getOperand(2).getImmedValue()==0) {
+      sourceReg = MI.getOperand(1).getReg();
+      destReg = MI.getOperand(0).getReg();
+      return true;
+    }
+  } else if (oc == PPC::ORI) {             // ori r1, r2, 0
+    assert(MI.getNumOperands() == 3 &&
+           MI.getOperand(0).isRegister() &&
+           MI.getOperand(1).isRegister() &&
+           MI.getOperand(2).isImmediate() &&
+           "invalid PPC ORI instruction!");
+    if (MI.getOperand(2).getImmedValue()==0) {
+      sourceReg = MI.getOperand(1).getReg();
+      destReg = MI.getOperand(0).getReg();
+      return true;
+    }
+  } else if (oc == PPC::FMRS || oc == PPC::FMRD ||
+             oc == PPC::FMRSD) {      // fmr r1, r2
+    assert(MI.getNumOperands() == 2 &&
+           MI.getOperand(0).isRegister() &&
+           MI.getOperand(1).isRegister() &&
+           "invalid PPC FMR instruction");
+    sourceReg = MI.getOperand(1).getReg();
+    destReg = MI.getOperand(0).getReg();
+    return true;
+  } else if (oc == PPC::MCRF) {             // mcrf cr1, cr2
+    assert(MI.getNumOperands() == 2 &&
+           MI.getOperand(0).isRegister() &&
+           MI.getOperand(1).isRegister() &&
+           "invalid PPC MCRF instruction");
+    sourceReg = MI.getOperand(1).getReg();
+    destReg = MI.getOperand(0).getReg();
+    return true;
+  }
+  return false;
+}
+
+// commuteInstruction - We can commute rlwimi instructions, but only if the
+// rotate amt is zero.  We also have to munge the immediates a bit.
+MachineInstr *PPC32InstrInfo::commuteInstruction(MachineInstr *MI) const {
+  // Normal instructions can be commuted the obvious way.
+  if (MI->getOpcode() != PPC::RLWIMI)
+    return TargetInstrInfo::commuteInstruction(MI);
+  
+  // Cannot commute if it has a non-zero rotate count.
+  if (MI->getOperand(3).getImmedValue() != 0)
+    return 0;
+  
+  // If we have a zero rotate count, we have:
+  //   M = mask(MB,ME)
+  //   Op0 = (Op1 & ~M) | (Op2 & M)
+  // Change this to:
+  //   M = mask((ME+1)&31, (MB-1)&31)
+  //   Op0 = (Op2 & ~M) | (Op1 & M)
+
+  // Swap op1/op2
+  unsigned Reg1 = MI->getOperand(1).getReg();
+  unsigned Reg2 = MI->getOperand(2).getReg();
+  MI->SetMachineOperandReg(2, Reg1);
+  MI->SetMachineOperandReg(1, Reg2);
+  
+  // Swap the mask around.
+  unsigned MB = MI->getOperand(4).getImmedValue();
+  unsigned ME = MI->getOperand(5).getImmedValue();
+  MI->getOperand(4).setImmedValue((ME+1) & 31);
+  MI->getOperand(5).setImmedValue((MB-1) & 31);
+  return MI;
+}