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, 8 insertions, 13 deletions

diff --git a/llvm/lib/Target/ARM/Thumb1FrameLowering.cpp b/llvm/lib/Target/ARM/Thumb1FrameLowering.cpp
index 70dab9a..05852d8 100644
--- a/llvm/lib/Target/ARM/Thumb1FrameLowering.cpp
+++ b/llvm/lib/Target/ARM/Thumb1FrameLowering.cpp
@@ -52,10 +52,9 @@ void Thumb1FrameLowering::
 eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
                               MachineBasicBlock::iterator I) const {
   const Thumb1InstrInfo &TII =
-      *static_cast<const Thumb1InstrInfo *>(
-          MF.getTarget().getSubtargetImpl()->getInstrInfo());
+      *static_cast<const Thumb1InstrInfo *>(MF.getSubtarget().getInstrInfo());
   const Thumb1RegisterInfo *RegInfo = static_cast<const Thumb1RegisterInfo *>(
-      MF.getTarget().getSubtargetImpl()->getRegisterInfo());
+      MF.getSubtarget().getRegisterInfo());
   if (!hasReservedCallFrame(MF)) {
     // If we have alloca, convert as follows:
     // ADJCALLSTACKDOWN -> sub, sp, sp, amount
@@ -91,10 +90,9 @@ void Thumb1FrameLowering::emitPrologue(MachineFunction &MF) const {
   MachineModuleInfo &MMI = MF.getMMI();
   const MCRegisterInfo *MRI = MMI.getContext().getRegisterInfo();
   const Thumb1RegisterInfo *RegInfo = static_cast<const Thumb1RegisterInfo *>(
-      MF.getTarget().getSubtargetImpl()->getRegisterInfo());
+      MF.getSubtarget().getRegisterInfo());
   const Thumb1InstrInfo &TII =
-      *static_cast<const Thumb1InstrInfo *>(
-          MF.getTarget().getSubtargetImpl()->getInstrInfo());
+      *static_cast<const Thumb1InstrInfo *>(MF.getSubtarget().getInstrInfo());
 
   unsigned Align = MF.getTarget()
                        .getSubtargetImpl()
@@ -327,10 +325,9 @@ void Thumb1FrameLowering::emitEpilogue(MachineFunction &MF,
   MachineFrameInfo *MFI = MF.getFrameInfo();
   ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
   const Thumb1RegisterInfo *RegInfo = static_cast<const Thumb1RegisterInfo *>(
-      MF.getTarget().getSubtargetImpl()->getRegisterInfo());
+      MF.getSubtarget().getRegisterInfo());
   const Thumb1InstrInfo &TII =
-      *static_cast<const Thumb1InstrInfo *>(
-          MF.getTarget().getSubtargetImpl()->getInstrInfo());
+      *static_cast<const Thumb1InstrInfo *>(MF.getSubtarget().getInstrInfo());
 
   unsigned Align = MF.getTarget()
                        .getSubtargetImpl()
@@ -426,8 +423,7 @@ spillCalleeSavedRegisters(MachineBasicBlock &MBB,
 
   DebugLoc DL;
   MachineFunction &MF = *MBB.getParent();
-  const TargetInstrInfo &TII =
-      *MF.getTarget().getSubtargetImpl()->getInstrInfo();
+  const TargetInstrInfo &TII = *MF.getSubtarget().getInstrInfo();
 
   if (MI != MBB.end()) DL = MI->getDebugLoc();
 
@@ -466,8 +462,7 @@ restoreCalleeSavedRegisters(MachineBasicBlock &MBB,
 
   MachineFunction &MF = *MBB.getParent();
   ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
-  const TargetInstrInfo &TII =
-      *MF.getTarget().getSubtargetImpl()->getInstrInfo();
+  const TargetInstrInfo &TII = *MF.getSubtarget().getInstrInfo();
 
   bool isVarArg = AFI->getArgRegsSaveSize() > 0;
   DebugLoc DL = MI->getDebugLoc();