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, 6 insertions, 8 deletions

diff --git a/llvm/lib/CodeGen/IfConversion.cpp b/llvm/lib/CodeGen/IfConversion.cpp
index 5b6702befab..79eb0fc6fe8 100644
--- a/llvm/lib/CodeGen/IfConversion.cpp
+++ b/llvm/lib/CodeGen/IfConversion.cpp
@@ -269,9 +269,9 @@ INITIALIZE_PASS_DEPENDENCY(MachineBranchProbabilityInfo)
 INITIALIZE_PASS_END(IfConverter, "if-converter", "If Converter", false, false)
 
 bool IfConverter::runOnMachineFunction(MachineFunction &MF) {
-  TLI = MF.getTarget().getSubtargetImpl()->getTargetLowering();
-  TII = MF.getTarget().getSubtargetImpl()->getInstrInfo();
-  TRI = MF.getTarget().getSubtargetImpl()->getRegisterInfo();
+  TLI = MF.getSubtarget().getTargetLowering();
+  TII = MF.getSubtarget().getInstrInfo();
+  TRI = MF.getSubtarget().getRegisterInfo();
   MBPI = &getAnalysis<MachineBranchProbabilityInfo>();
   MRI = &MF.getRegInfo();
 
@@ -287,9 +287,8 @@ bool IfConverter::runOnMachineFunction(MachineFunction &MF) {
   if (!PreRegAlloc) {
     // Tail merge tend to expose more if-conversion opportunities.
     BranchFolder BF(true, false);
-    BFChange = BF.OptimizeFunction(
-        MF, TII, MF.getTarget().getSubtargetImpl()->getRegisterInfo(),
-        getAnalysisIfAvailable<MachineModuleInfo>());
+    BFChange = BF.OptimizeFunction(MF, TII, MF.getSubtarget().getRegisterInfo(),
+                                   getAnalysisIfAvailable<MachineModuleInfo>());
   }
 
   DEBUG(dbgs() << "\nIfcvt: function (" << ++FnNum <<  ") \'"
@@ -421,8 +420,7 @@ bool IfConverter::runOnMachineFunction(MachineFunction &MF) {
 
   if (MadeChange && IfCvtBranchFold) {
     BranchFolder BF(false, false);
-    BF.OptimizeFunction(MF, TII,
-                        MF.getTarget().getSubtargetImpl()->getRegisterInfo(),
+    BF.OptimizeFunction(MF, TII, MF.getSubtarget().getRegisterInfo(),
                         getAnalysisIfAvailable<MachineModuleInfo>());
   }