llvm_unreachable->llvm_unreachable(0), LLVM_UNREACHABLE->llvm_unreachable.

[oota-llvm.git] / lib / Target / MSP430 / MSP430InstrInfo.cpp

diff --git a/lib/Target/MSP430/MSP430InstrInfo.cpp b/lib/Target/MSP430/MSP430InstrInfo.cpp
index c84c96e6569f6887159ecb5a42f9ddaa25550eca..37fbb6d9999bc31e95a862ff235c055830da3ddf 100644 (file)
--- a/lib/Target/MSP430/MSP430InstrInfo.cpp
+++ b/lib/Target/MSP430/MSP430InstrInfo.cpp
@@ -13,35 +13,81 @@
 
 #include "MSP430.h"
 #include "MSP430InstrInfo.h"
+#include "MSP430MachineFunctionInfo.h"
 #include "MSP430TargetMachine.h"
 #include "MSP430GenInstrInfo.inc"
 #include "llvm/Function.h"
-#include "llvm/CodeGen/MachineFunction.h"
+#include "llvm/CodeGen/MachineFrameInfo.h"
 #include "llvm/CodeGen/MachineInstrBuilder.h"
 #include "llvm/CodeGen/MachineRegisterInfo.h"
-
+#include "llvm/CodeGen/PseudoSourceValue.h"
+#include "llvm/Support/ErrorHandling.h"
 
 using namespace llvm;
 
 MSP430InstrInfo::MSP430InstrInfo(MSP430TargetMachine &tm)
   : TargetInstrInfoImpl(MSP430Insts, array_lengthof(MSP430Insts)),
-    RI(*this), TM(tm) {}
+    RI(tm, *this), TM(tm) {}
+
+void MSP430InstrInfo::storeRegToStackSlot(MachineBasicBlock &MBB,
+                                          MachineBasicBlock::iterator MI,
+                                    unsigned SrcReg, bool isKill, int FrameIdx,
+                                    const TargetRegisterClass *RC) const {
+  DebugLoc DL = DebugLoc::getUnknownLoc();
+  if (MI != MBB.end()) DL = MI->getDebugLoc();
+
+  if (RC == &MSP430::GR16RegClass)
+    BuildMI(MBB, MI, DL, get(MSP430::MOV16mr))
+      .addFrameIndex(FrameIdx).addImm(0)
+      .addReg(SrcReg, getKillRegState(isKill));
+  else if (RC == &MSP430::GR8RegClass)
+    BuildMI(MBB, MI, DL, get(MSP430::MOV8mr))
+      .addFrameIndex(FrameIdx).addImm(0)
+      .addReg(SrcReg, getKillRegState(isKill));
+  else
+    llvm_unreachable("Cannot store this register to stack slot!");
+}
+
+void MSP430InstrInfo::loadRegFromStackSlot(MachineBasicBlock &MBB,
+                                           MachineBasicBlock::iterator MI,
+                                           unsigned DestReg, int FrameIdx,
+                                           const TargetRegisterClass *RC) const{
+  DebugLoc DL = DebugLoc::getUnknownLoc();
+  if (MI != MBB.end()) DL = MI->getDebugLoc();
+
+  if (RC == &MSP430::GR16RegClass)
+    BuildMI(MBB, MI, DL, get(MSP430::MOV16rm))
+      .addReg(DestReg).addFrameIndex(FrameIdx).addImm(0);
+  else if (RC == &MSP430::GR8RegClass)
+    BuildMI(MBB, MI, DL, get(MSP430::MOV8rm))
+      .addReg(DestReg).addFrameIndex(FrameIdx).addImm(0);
+  else
+    llvm_unreachable("Cannot store this register to stack slot!");
+}
 
 bool MSP430InstrInfo::copyRegToReg(MachineBasicBlock &MBB,
                                    MachineBasicBlock::iterator I,
                                    unsigned DestReg, unsigned SrcReg,
                                    const TargetRegisterClass *DestRC,
                                    const TargetRegisterClass *SrcRC) const {
-  if (DestRC != SrcRC) {
-    // Not yet supported!
-    return false;
-  }
-
   DebugLoc DL = DebugLoc::getUnknownLoc();
   if (I != MBB.end()) DL = I->getDebugLoc();
 
-  BuildMI(MBB, I, DL, get(MSP430::MOV16rr), DestReg).addReg(SrcReg);
-  return true;
+  if (DestRC == SrcRC) {
+    unsigned Opc;
+    if (DestRC == &MSP430::GR16RegClass) {
+      Opc = MSP430::MOV16rr;
+    } else if (DestRC == &MSP430::GR8RegClass) {
+      Opc = MSP430::MOV8rr;
+    } else {
+      return false;
+    }
+
+    BuildMI(MBB, I, DL, get(Opc), DestReg).addReg(SrcReg);
+    return true;
+  }
+
+  return false;
 }
 
 bool
@@ -53,8 +99,9 @@ MSP430InstrInfo::isMoveInstr(const MachineInstr& MI,
   switch (MI.getOpcode()) {
   default:
     return false;
+  case MSP430::MOV8rr:
   case MSP430::MOV16rr:
-    assert(MI.getNumOperands() >= 2 &&
+   assert(MI.getNumOperands() >= 2 &&
            MI.getOperand(0).isReg() &&
            MI.getOperand(1).isReg() &&
            "invalid register-register move instruction");
@@ -63,3 +110,69 @@ MSP430InstrInfo::isMoveInstr(const MachineInstr& MI,
     return true;
   }
 }
+
+bool
+MSP430InstrInfo::spillCalleeSavedRegisters(MachineBasicBlock &MBB,
+                                           MachineBasicBlock::iterator MI,
+                                const std::vector<CalleeSavedInfo> &CSI) const {
+  if (CSI.empty())
+    return false;
+
+  DebugLoc DL = DebugLoc::getUnknownLoc();
+  if (MI != MBB.end()) DL = MI->getDebugLoc();
+
+  MachineFunction &MF = *MBB.getParent();
+  MSP430MachineFunctionInfo *MFI = MF.getInfo<MSP430MachineFunctionInfo>();
+  MFI->setCalleeSavedFrameSize(CSI.size() * 2);
+
+  for (unsigned i = CSI.size(); i != 0; --i) {
+    unsigned Reg = CSI[i-1].getReg();
+    // Add the callee-saved register as live-in. It's killed at the spill.
+    MBB.addLiveIn(Reg);
+    BuildMI(MBB, MI, DL, get(MSP430::PUSH16r))
+      .addReg(Reg, RegState::Kill);
+  }
+  return true;
+}
+
+bool
+MSP430InstrInfo::restoreCalleeSavedRegisters(MachineBasicBlock &MBB,
+                                             MachineBasicBlock::iterator MI,
+                                const std::vector<CalleeSavedInfo> &CSI) const {
+  if (CSI.empty())
+    return false;
+
+  DebugLoc DL = DebugLoc::getUnknownLoc();
+  if (MI != MBB.end()) DL = MI->getDebugLoc();
+
+  for (unsigned i = 0, e = CSI.size(); i != e; ++i)
+    BuildMI(MBB, MI, DL, get(MSP430::POP16r), CSI[i].getReg());
+
+  return true;
+}
+
+unsigned
+MSP430InstrInfo::InsertBranch(MachineBasicBlock &MBB, MachineBasicBlock *TBB,
+                              MachineBasicBlock *FBB,
+                            const SmallVectorImpl<MachineOperand> &Cond) const {
+  // FIXME this should probably have a DebugLoc operand
+  DebugLoc dl = DebugLoc::getUnknownLoc();
+
+  // Shouldn't be a fall through.
+  assert(TBB && "InsertBranch must not be told to insert a fallthrough");
+  assert((Cond.size() == 1 || Cond.size() == 0) &&
+         "MSP430 branch conditions have one component!");
+
+  if (Cond.empty()) {
+    // Unconditional branch?
+    assert(!FBB && "Unconditional branch with multiple successors!");
+    BuildMI(&MBB, dl, get(MSP430::JMP)).addMBB(TBB);
+    return 1;
+  }
+
+  // Conditional branch.
+  unsigned Count = 0;
+  llvm_unreachable("Implement conditional branches!");
+
+  return Count;
+}