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, 13 insertions, 26 deletions

diff --git a/llvm/lib/CodeGen/PrologEpilogInserter.cpp b/llvm/lib/CodeGen/PrologEpilogInserter.cpp
index 1f0110104bf..9d332cad9c5 100644
--- a/llvm/lib/CodeGen/PrologEpilogInserter.cpp
+++ b/llvm/lib/CodeGen/PrologEpilogInserter.cpp
@@ -111,10 +111,8 @@ typedef SmallSetVector<int, 8> StackObjSet;
 ///
 bool PEI::runOnMachineFunction(MachineFunction &Fn) {
   const Function* F = Fn.getFunction();
-  const TargetRegisterInfo *TRI =
-      Fn.getTarget().getSubtargetImpl()->getRegisterInfo();
-  const TargetFrameLowering *TFI =
-      Fn.getTarget().getSubtargetImpl()->getFrameLowering();
+  const TargetRegisterInfo *TRI = Fn.getSubtarget().getRegisterInfo();
+  const TargetFrameLowering *TFI = Fn.getSubtarget().getFrameLowering();
 
   assert(!Fn.getRegInfo().getNumVirtRegs() && "Regalloc must assign all vregs");
 
@@ -188,10 +186,8 @@ bool PEI::runOnMachineFunction(MachineFunction &Fn) {
 /// variables for the function's frame information and eliminate call frame
 /// pseudo instructions.
 void PEI::calculateCallsInformation(MachineFunction &Fn) {
-  const TargetInstrInfo &TII =
-      *Fn.getTarget().getSubtargetImpl()->getInstrInfo();
-  const TargetFrameLowering *TFI =
-      Fn.getTarget().getSubtargetImpl()->getFrameLowering();
+  const TargetInstrInfo &TII = *Fn.getSubtarget().getInstrInfo();
+  const TargetFrameLowering *TFI = Fn.getSubtarget().getFrameLowering();
   MachineFrameInfo *MFI = Fn.getFrameInfo();
 
   unsigned MaxCallFrameSize = 0;
@@ -244,10 +240,8 @@ void PEI::calculateCallsInformation(MachineFunction &Fn) {
 /// calculateCalleeSavedRegisters - Scan the function for modified callee saved
 /// registers.
 void PEI::calculateCalleeSavedRegisters(MachineFunction &F) {
-  const TargetRegisterInfo *RegInfo =
-      F.getTarget().getSubtargetImpl()->getRegisterInfo();
-  const TargetFrameLowering *TFI =
-      F.getTarget().getSubtargetImpl()->getFrameLowering();
+  const TargetRegisterInfo *RegInfo = F.getSubtarget().getRegisterInfo();
+  const TargetFrameLowering *TFI = F.getSubtarget().getFrameLowering();
   MachineFrameInfo *MFI = F.getFrameInfo();
 
   // Get the callee saved register list...
@@ -344,12 +338,9 @@ void PEI::insertCSRSpillsAndRestores(MachineFunction &Fn) {
   if (CSI.empty())
     return;
 
-  const TargetInstrInfo &TII =
-      *Fn.getTarget().getSubtargetImpl()->getInstrInfo();
-  const TargetFrameLowering *TFI =
-      Fn.getTarget().getSubtargetImpl()->getFrameLowering();
-  const TargetRegisterInfo *TRI =
-      Fn.getTarget().getSubtargetImpl()->getRegisterInfo();
+  const TargetInstrInfo &TII = *Fn.getSubtarget().getInstrInfo();
+  const TargetFrameLowering *TFI = Fn.getSubtarget().getFrameLowering();
+  const TargetRegisterInfo *TRI = Fn.getSubtarget().getRegisterInfo();
   MachineBasicBlock::iterator I;
 
   // Spill using target interface.
@@ -455,8 +446,7 @@ AssignProtectedObjSet(const StackObjSet &UnassignedObjs,
 /// abstract stack objects.
 ///
 void PEI::calculateFrameObjectOffsets(MachineFunction &Fn) {
-  const TargetFrameLowering &TFI =
-      *Fn.getTarget().getSubtargetImpl()->getFrameLowering();
+  const TargetFrameLowering &TFI = *Fn.getSubtarget().getFrameLowering();
   StackProtector *SP = &getAnalysis<StackProtector>();
 
   bool StackGrowsDown =
@@ -526,8 +516,7 @@ void PEI::calculateFrameObjectOffsets(MachineFunction &Fn) {
   // Make sure the special register scavenging spill slot is closest to the
   // incoming stack pointer if a frame pointer is required and is closer
   // to the incoming rather than the final stack pointer.
-  const TargetRegisterInfo *RegInfo =
-      Fn.getTarget().getSubtargetImpl()->getRegisterInfo();
+  const TargetRegisterInfo *RegInfo = Fn.getSubtarget().getRegisterInfo();
   bool EarlyScavengingSlots = (TFI.hasFP(Fn) &&
                                TFI.isFPCloseToIncomingSP() &&
                                RegInfo->useFPForScavengingIndex(Fn) &&
@@ -682,8 +671,7 @@ void PEI::calculateFrameObjectOffsets(MachineFunction &Fn) {
 /// prolog and epilog code to the function.
 ///
 void PEI::insertPrologEpilogCode(MachineFunction &Fn) {
-  const TargetFrameLowering &TFI =
-      *Fn.getTarget().getSubtargetImpl()->getFrameLowering();
+  const TargetFrameLowering &TFI = *Fn.getSubtarget().getFrameLowering();
 
   // Add prologue to the function...
   TFI.emitPrologue(Fn);
@@ -754,8 +742,7 @@ void PEI::replaceFrameIndices(MachineBasicBlock *BB, MachineFunction &Fn,
   const TargetMachine &TM = Fn.getTarget();
   assert(TM.getSubtargetImpl()->getRegisterInfo() &&
          "TM::getRegisterInfo() must be implemented!");
-  const TargetInstrInfo &TII =
-      *Fn.getTarget().getSubtargetImpl()->getInstrInfo();
+  const TargetInstrInfo &TII = *Fn.getSubtarget().getInstrInfo();
   const TargetRegisterInfo &TRI = *TM.getSubtargetImpl()->getRegisterInfo();
   const TargetFrameLowering *TFI = TM.getSubtargetImpl()->getFrameLowering();
   bool StackGrowsDown =