Add code for save/restore of callee-saved registers
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@70739 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/MSP430/MSP430InstrInfo.cpp b/lib/Target/MSP430/MSP430InstrInfo.cpp
index c32dbdc..199a323 100644
--- a/lib/Target/MSP430/MSP430InstrInfo.cpp
+++ b/lib/Target/MSP430/MSP430InstrInfo.cpp
@@ -13,6 +13,7 @@
#include "MSP430.h"
#include "MSP430InstrInfo.h"
+#include "MSP430MachineFunctionInfo.h"
#include "MSP430TargetMachine.h"
#include "MSP430GenInstrInfo.inc"
#include "llvm/Function.h"
@@ -108,3 +109,43 @@
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, /*isDef=*/false, /*isImp=*/false, /*isKill=*/true);
+ }
+ 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;
+}