Move callee-saved regs spills / reloads to TFI

llvm-svn: 120228

1 files changed, 71 insertions, 0 deletions

diff --git a/llvm/lib/Target/X86/X86FrameInfo.cpp b/llvm/lib/Target/X86/X86FrameInfo.cpp
index 420568ab774..192ed8ebe01 100644
--- a/llvm/lib/Target/X86/X86FrameInfo.cpp
+++ b/llvm/lib/Target/X86/X86FrameInfo.cpp
@@ -799,3 +799,74 @@ int X86FrameInfo::getFrameIndexOffset(const MachineFunction &MF, int FI) const {
 
   return Offset;
 }
+
+bool X86FrameInfo::spillCalleeSavedRegisters(MachineBasicBlock &MBB,
+                                             MachineBasicBlock::iterator MI,
+                                        const std::vector<CalleeSavedInfo> &CSI,
+                                          const TargetRegisterInfo *TRI) const {
+  if (CSI.empty())
+    return false;
+
+  DebugLoc DL = MBB.findDebugLoc(MI);
+
+  MachineFunction &MF = *MBB.getParent();
+
+  bool isWin64 = STI.isTargetWin64();
+  unsigned SlotSize = STI.is64Bit() ? 8 : 4;
+  unsigned FPReg = TRI->getFrameRegister(MF);
+  unsigned CalleeFrameSize = 0;
+
+  const TargetInstrInfo &TII = *MF.getTarget().getInstrInfo();
+  X86MachineFunctionInfo *X86FI = MF.getInfo<X86MachineFunctionInfo>();
+
+  unsigned Opc = STI.is64Bit() ? X86::PUSH64r : X86::PUSH32r;
+  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);
+    if (Reg == FPReg)
+      // X86RegisterInfo::emitPrologue will handle spilling of frame register.
+      continue;
+    if (!X86::VR128RegClass.contains(Reg) && !isWin64) {
+      CalleeFrameSize += SlotSize;
+      BuildMI(MBB, MI, DL, TII.get(Opc)).addReg(Reg, RegState::Kill);
+    } else {
+      const TargetRegisterClass *RC = TRI->getMinimalPhysRegClass(Reg);
+      TII.storeRegToStackSlot(MBB, MI, Reg, true, CSI[i-1].getFrameIdx(),
+                              RC, TRI);
+    }
+  }
+
+  X86FI->setCalleeSavedFrameSize(CalleeFrameSize);
+  return true;
+}
+
+bool X86FrameInfo::restoreCalleeSavedRegisters(MachineBasicBlock &MBB,
+                                               MachineBasicBlock::iterator MI,
+                                        const std::vector<CalleeSavedInfo> &CSI,
+                                          const TargetRegisterInfo *TRI) const {
+  if (CSI.empty())
+    return false;
+
+  DebugLoc DL = MBB.findDebugLoc(MI);
+
+  MachineFunction &MF = *MBB.getParent();
+  const TargetInstrInfo &TII = *MF.getTarget().getInstrInfo();
+  unsigned FPReg = TRI->getFrameRegister(MF);
+  bool isWin64 = STI.isTargetWin64();
+  unsigned Opc = STI.is64Bit() ? X86::POP64r : X86::POP32r;
+  for (unsigned i = 0, e = CSI.size(); i != e; ++i) {
+    unsigned Reg = CSI[i].getReg();
+    if (Reg == FPReg)
+      // X86RegisterInfo::emitEpilogue will handle restoring of frame register.
+      continue;
+    if (!X86::VR128RegClass.contains(Reg) && !isWin64) {
+      BuildMI(MBB, MI, DL, TII.get(Opc), Reg);
+    } else {
+      const TargetRegisterClass *RC = TRI->getMinimalPhysRegClass(Reg);
+      TII.loadRegFromStackSlot(MBB, MI, Reg, CSI[i].getFrameIdx(),
+                               RC, TRI);
+    }
+  }
+  return true;
+}