Have MachineFunction cache a pointer to the subtarget to make lookups

shorter/easier and have the DAG use that to do the same lookup. This
can be used in the future for TargetMachine based caching lookups from
the MachineFunction easily.

Update the MIPS subtarget switching machinery to update this pointer
at the same time it runs.

llvm-svn: 214838

1 files changed, 5 insertions, 10 deletions

diff --git a/llvm/lib/Target/MSP430/MSP430RegisterInfo.cpp b/llvm/lib/Target/MSP430/MSP430RegisterInfo.cpp
index 41de23862c8..afd7e070b7f 100644
--- a/llvm/lib/Target/MSP430/MSP430RegisterInfo.cpp
+++ b/llvm/lib/Target/MSP430/MSP430RegisterInfo.cpp
@@ -37,8 +37,7 @@ MSP430RegisterInfo::MSP430RegisterInfo()
 
 const MCPhysReg*
 MSP430RegisterInfo::getCalleeSavedRegs(const MachineFunction *MF) const {
-  const TargetFrameLowering *TFI =
-      MF->getTarget().getSubtargetImpl()->getFrameLowering();
+  const TargetFrameLowering *TFI = MF->getSubtarget().getFrameLowering();
   const Function* F = MF->getFunction();
   static const MCPhysReg CalleeSavedRegs[] = {
     MSP430::FPW, MSP430::R5W, MSP430::R6W, MSP430::R7W,
@@ -74,8 +73,7 @@ MSP430RegisterInfo::getCalleeSavedRegs(const MachineFunction *MF) const {
 
 BitVector MSP430RegisterInfo::getReservedRegs(const MachineFunction &MF) const {
   BitVector Reserved(getNumRegs());
-  const TargetFrameLowering *TFI =
-      MF.getTarget().getSubtargetImpl()->getFrameLowering();
+  const TargetFrameLowering *TFI = MF.getSubtarget().getFrameLowering();
 
   // Mark 4 special registers with subregisters as reserved.
   Reserved.set(MSP430::PCB);
@@ -111,8 +109,7 @@ MSP430RegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II,
   MachineInstr &MI = *II;
   MachineBasicBlock &MBB = *MI.getParent();
   MachineFunction &MF = *MBB.getParent();
-  const TargetFrameLowering *TFI =
-      MF.getTarget().getSubtargetImpl()->getFrameLowering();
+  const TargetFrameLowering *TFI = MF.getSubtarget().getFrameLowering();
   DebugLoc dl = MI.getDebugLoc();
   int FrameIndex = MI.getOperand(FIOperandNum).getIndex();
 
@@ -134,8 +131,7 @@ MSP430RegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II,
     // This is actually "load effective address" of the stack slot
     // instruction. We have only two-address instructions, thus we need to
     // expand it into mov + add
-    const TargetInstrInfo &TII =
-        *MF.getTarget().getSubtargetImpl()->getInstrInfo();
+    const TargetInstrInfo &TII = *MF.getSubtarget().getInstrInfo();
 
     MI.setDesc(TII.get(MSP430::MOV16rr));
     MI.getOperand(FIOperandNum).ChangeToRegister(BasePtr, false);
@@ -160,8 +156,7 @@ MSP430RegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II,
 }
 
 unsigned MSP430RegisterInfo::getFrameRegister(const MachineFunction &MF) const {
-  const TargetFrameLowering *TFI =
-      MF.getTarget().getSubtargetImpl()->getFrameLowering();
+  const TargetFrameLowering *TFI = MF.getSubtarget().getFrameLowering();
 
   return TFI->hasFP(MF) ? MSP430::FPW : MSP430::SPW;
 }