Move enabling the local stack allocation pass into the target where it belongs.

For now it's still a command line option, but the interface to the generic
code doesn't need to know that.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@111942 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/ARM/ARMBaseRegisterInfo.cpp

@@ -43,9 +43,12 @@ namespace llvm {
 cl::opt<bool>
 ReuseFrameIndexVals("arm-reuse-frame-index-vals", cl::Hidden, cl::init(true),
           cl::desc("Reuse repeated frame index values"));
-cl::opt<bool>
+static cl::opt<bool>
 ForceAllBaseRegAlloc("arm-force-base-reg-alloc", cl::Hidden, cl::init(true),
           cl::desc("Force use of virtual base registers for stack load/store"));
+static cl::opt<bool>
+EnableLocalStackAlloc("enable-local-stack-alloc", cl::init(false), cl::Hidden,
+          cl::desc("Enable pre-regalloc stack frame index allocation"));
 }
 
 using namespace llvm;
@@ -1285,6 +1288,11 @@ requiresFrameIndexScavenging(const MachineFunction &MF) const {
   return true;
 }
 
+bool ARMBaseRegisterInfo::
+requiresVirtualBaseRegisters(const MachineFunction &MF) const {
+  return EnableLocalStackAlloc;
+}
+
 // hasReservedCallFrame - Under normal circumstances, when a frame pointer is
 // not required, we reserve argument space for call sites in the function
 // immediately on entry to the current function. This eliminates the need for

lib/Target/ARM/ARMBaseRegisterInfo.h

@@ -154,6 +154,8 @@ public:
 
   virtual bool requiresFrameIndexScavenging(const MachineFunction &MF) const;
 
+  virtual bool requiresVirtualBaseRegisters(const MachineFunction &MF) const;
+
   virtual bool hasReservedCallFrame(const MachineFunction &MF) const;
   virtual bool canSimplifyCallFramePseudos(const MachineFunction &MF) const;