Provide set of reserved registers

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@70704 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/MSP430/MSP430ISelLowering.cpp b/lib/Target/MSP430/MSP430ISelLowering.cpp
index 625df96d19850a3714c785de5ea226d2a0d96611..7577a53b8f2ba37a8c12f6eec3f12ae453efce49 100644 (file)
--- a/lib/Target/MSP430/MSP430ISelLowering.cpp
+++ b/lib/Target/MSP430/MSP430ISelLowering.cpp
@@ -80,8 +80,8 @@ SDValue MSP430TargetLowering::LowerFORMAL_ARGUMENTS(SDValue Op,
 /// generate load operations for arguments places on the stack.
 // FIXME: struct return stuff
 // FIXME: varargs
-SDValue MSP430TargetLowering:: LowerCCCArguments(SDValue Op,
-                                                 SelectionDAG &DAG) {
+SDValue MSP430TargetLowering::LowerCCCArguments(SDValue Op,
+                                                SelectionDAG &DAG) {
   MachineFunction &MF = DAG.getMachineFunction();
   MachineFrameInfo *MFI = MF.getFrameInfo();
   MachineRegisterInfo &RegInfo = MF.getRegInfo();
@@ -193,8 +193,8 @@ SDValue MSP430TargetLowering::LowerRET(SDValue Op, SelectionDAG &DAG) {
     Chain = DAG.getCopyToReg(Chain, dl, VA.getLocReg(),
                              Op.getOperand(i*2+1), Flag);
 
-    // guarantee that all emitted copies are
-    // stuck together, avoiding something bad
+    // Guarantee that all emitted copies are stuck together,
+    // avoiding something bad.
     Flag = Chain.getValue(1);
   }
 

diff --git a/lib/Target/MSP430/MSP430RegisterInfo.cpp b/lib/Target/MSP430/MSP430RegisterInfo.cpp
index 1b9fc67db6d1700df54f57d93eaee2630575fd8f..f86f120d2b604d972221bd0c0ffbfebbd569b75b 100644 (file)
--- a/lib/Target/MSP430/MSP430RegisterInfo.cpp
+++ b/lib/Target/MSP430/MSP430RegisterInfo.cpp
@@ -38,7 +38,19 @@ MSP430RegisterInfo::getCalleeSavedRegClasses(const MachineFunction *MF) const {
 
 BitVector
 MSP430RegisterInfo::getReservedRegs(const MachineFunction &MF) const {
-  assert(0 && "Not implemented yet!");
+  BitVector Reserved(getNumRegs());
+
+  // Mark 4 special registers as reserved.
+  Reserved.set(MSP430::PC);
+  Reserved.set(MSP430::SP);
+  Reserved.set(MSP430::SR);
+  Reserved.set(MSP430::CG);
+
+  // Mark frame pointer as reserved if needed.
+  if (hasFP(MF))
+    Reserved.set(MSP430::FP);
+
+  return Reserved;
 }
 
 bool MSP430RegisterInfo::hasFP(const MachineFunction &MF) const {