TargetLowering: Add finalizeLowering() function; NFC

Adds a new method finalizeLowering to TargetLoweringBase. This is in
preparation for an upcoming commit.

This function is meant for target specific adjustments to
MachineFrameInfo or register reservations.

Move the freezeRegisters() and the hasCopyImplyingStackAdjustment()
handling into the new function to prove the concept. As an added bonus
GlobalISel no longer missed the hasCopyImplyingStackAdjustment()
handling with this.

Differential Revision: https://reviews.llvm.org/D32621

llvm-svn: 301679

3 files changed, 7 insertions, 10 deletions

diff --git a/llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp b/llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp
index 5fb8dfc95d3..7d4aceda228 100644
--- a/llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp
+++ b/llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp
@@ -1199,9 +1199,7 @@ bool IRTranslator::runOnMachineFunction(MachineFunction &CurMF) {
 
   finishPendingPhis();
 
-  // Now that the MachineFrameInfo has been configured, no further changes to
-  // the reserved registers are possible.
-  MRI->freezeReservedRegs(*MF);
+  TLI->finalizeLowering(*MF);
 
   // Merge the argument lowering and constants block with its single
   // successor, the LLVM-IR entry block.  We want the basic block to
diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
index e7ef782e77f..3aabdaeaa09 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
@@ -593,13 +593,7 @@ bool SelectionDAGISel::runOnMachineFunction(MachineFunction &mf) {
     MRI.replaceRegWith(From, To);
   }
 
-  if (TLI->hasCopyImplyingStackAdjustment(MF))
-    MFI.setHasCopyImplyingStackAdjustment(true);
-
-  // Freeze the set of reserved registers now that MachineFrameInfo has been
-  // set up. All the information required by getReservedRegs() should be
-  // available now.
-  MRI.freezeReservedRegs(*MF);
+  TLI->finalizeLowering(*MF);
 
   // Release function-specific state. SDB and CurDAG are already cleared
   // at this point.
diff --git a/llvm/lib/CodeGen/TargetLoweringBase.cpp b/llvm/lib/CodeGen/TargetLoweringBase.cpp
index 9b9f45f0404..7474d5ab9dc 100644
--- a/llvm/lib/CodeGen/TargetLoweringBase.cpp
+++ b/llvm/lib/CodeGen/TargetLoweringBase.cpp
@@ -21,6 +21,7 @@
 #include "llvm/CodeGen/MachineFunction.h"
 #include "llvm/CodeGen/MachineInstrBuilder.h"
 #include "llvm/CodeGen/MachineJumpTableInfo.h"
+#include "llvm/CodeGen/MachineRegisterInfo.h"
 #include "llvm/CodeGen/StackMaps.h"
 #include "llvm/IR/DataLayout.h"
 #include "llvm/IR/DerivedTypes.h"
@@ -2108,3 +2109,7 @@ int TargetLoweringBase::getDivRefinementSteps(EVT VT,
                                               MachineFunction &MF) const {
   return getOpRefinementSteps(false, VT, getRecipEstimateForFunc(MF));
 }
+
+void TargetLoweringBase::finalizeLowering(MachineFunction &MF) const {
+  MF.getRegInfo().freezeReservedRegs(MF);
+}