Remove the target independent TargetMachine::getSubtarget and

TargetMachine::getSubtargetImpl routines.

This keeps the target independent code free of bare subtarget
calls while the remainder of the backends are migrated, or not
if they don't wish to support per-function subtargets as would
be needed for function multiversioning or LTO of disparate
cpu subarchitecture types, e.g.

clang -msse4.2 -c foo.c -emit-llvm -o foo.bc
clang -c bar.c -emit-llvm -o bar.bc
llvm-link foo.bc bar.bc -o baz.bc
llc baz.bc

and get appropriate code for what the command lines requested.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@232885 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Target/TargetMachine.h

@@ -108,11 +108,8 @@ public:
 
   /// getSubtargetImpl - virtual method implemented by subclasses that returns
   /// a reference to that target's TargetSubtargetInfo-derived member variable.
-  virtual const TargetSubtargetInfo *getSubtargetImpl() const {
-    return nullptr;
-  }
   virtual const TargetSubtargetInfo *getSubtargetImpl(const Function &) const {
-    return getSubtargetImpl();
+    return nullptr;
   }
   virtual TargetLoweringObjectFile *getObjFileLowering() const {
     return nullptr;
@@ -121,9 +118,6 @@ public:
   /// getSubtarget - This method returns a pointer to the specified type of
   /// TargetSubtargetInfo.  In debug builds, it verifies that the object being
   /// returned is of the correct type.
-  template<typename STC> const STC &getSubtarget() const {
-    return *static_cast<const STC*>(getSubtargetImpl());
-  }
   template <typename STC> const STC &getSubtarget(const Function &F) const {
     return *static_cast<const STC*>(getSubtargetImpl(F));
   }

lib/Target/ARM/ARMTargetMachine.h

@@ -44,7 +44,7 @@ public:
                        bool isLittle);
   ~ARMBaseTargetMachine() override;
 
-  const ARMSubtarget *getSubtargetImpl() const override { return &Subtarget; }
+  const ARMSubtarget *getSubtargetImpl() const { return &Subtarget; }
   const ARMSubtarget *getSubtargetImpl(const Function &F) const override;
   bool isLittleEndian() const { return isLittle; }
 

lib/Target/BPF/BPFTargetMachine.h

@@ -27,7 +27,10 @@ public:
                    const TargetOptions &Options, Reloc::Model RM,
                    CodeModel::Model CM, CodeGenOpt::Level OL);
 
-  const BPFSubtarget *getSubtargetImpl() const override { return &Subtarget; }
+  const BPFSubtarget *getSubtargetImpl() const { return &Subtarget; }
+  const BPFSubtarget *getSubtargetImpl(const Function &) const override {
+    return &Subtarget;
+  }
 
   TargetPassConfig *createPassConfig(PassManagerBase &PM) override;
 

lib/Target/CppBackend/CPPTargetMachine.h

@@ -22,20 +22,13 @@ namespace llvm {
 
 class formatted_raw_ostream;
 
-class CPPSubtarget : public TargetSubtargetInfo {
-};
-
 struct CPPTargetMachine : public TargetMachine {
   CPPTargetMachine(const Target &T, StringRef TT, StringRef CPU, StringRef FS,
                    const TargetOptions &Options, Reloc::Model RM,
                    CodeModel::Model CM, CodeGenOpt::Level OL)
-      : TargetMachine(T, "", TT, CPU, FS, Options), Subtarget() {}
+      : TargetMachine(T, "", TT, CPU, FS, Options) {}
-
-private:
-  CPPSubtarget Subtarget;
 
 public:
-  const CPPSubtarget *getSubtargetImpl() const override { return &Subtarget; }
   bool addPassesToEmitFile(PassManagerBase &PM, formatted_raw_ostream &Out,
                            CodeGenFileType FileType, bool DisableVerify,
                            AnalysisID StartAfter,

lib/Target/Hexagon/HexagonTargetMachine.h

@@ -32,7 +32,7 @@ public:
                        Reloc::Model RM, CodeModel::Model CM,
                        CodeGenOpt::Level OL);
   ~HexagonTargetMachine() override;
-  const HexagonSubtarget *getSubtargetImpl() const override {
+  const HexagonSubtarget *getSubtargetImpl(const Function &) const override {
     return &Subtarget;
   }
   static unsigned getModuleMatchQuality(const Module &M);

lib/Target/MSP430/MSP430TargetMachine.h

@@ -34,7 +34,7 @@ public:
                       CodeGenOpt::Level OL);
   ~MSP430TargetMachine() override;
 
-  const MSP430Subtarget *getSubtargetImpl() const override {
+  const MSP430Subtarget *getSubtargetImpl(const Function &F) const override {
     return &Subtarget;
   }
   TargetPassConfig *createPassConfig(PassManagerBase &PM) override;

lib/Target/Mips/MipsTargetMachine.h

@@ -46,7 +46,7 @@ public:
 
   TargetIRAnalysis getTargetIRAnalysis() override;
 
-  const MipsSubtarget *getSubtargetImpl() const override {
+  const MipsSubtarget *getSubtargetImpl() const {
     if (Subtarget)
       return Subtarget;
     return &DefaultSubtarget;

lib/Target/NVPTX/NVPTXTargetMachine.h

@@ -39,7 +39,10 @@ public:
                      CodeModel::Model CM, CodeGenOpt::Level OP, bool is64bit);
 
   ~NVPTXTargetMachine() override;
-  const NVPTXSubtarget *getSubtargetImpl() const override { return &Subtarget; }
+  const NVPTXSubtarget *getSubtargetImpl(const Function &) const override {
+    return &Subtarget;
+  }
+  const NVPTXSubtarget *getSubtargetImpl() const { return &Subtarget; }
   bool is64Bit() const { return is64bit; }
   NVPTX::DrvInterface getDrvInterface() const { return drvInterface; }
   ManagedStringPool *getManagedStrPool() const {

lib/Target/R600/AMDGPUTargetMachine.h

@@ -42,7 +42,8 @@ public:
                       CodeModel::Model CM, CodeGenOpt::Level OL);
   ~AMDGPUTargetMachine();
 
-  const AMDGPUSubtarget *getSubtargetImpl() const override {
+  const AMDGPUSubtarget *getSubtargetImpl() const { return &Subtarget; }
+  const AMDGPUSubtarget *getSubtargetImpl(const Function &) const override {
     return &Subtarget;
   }
   const AMDGPUIntrinsicInfo *getIntrinsicInfo() const override {

lib/Target/Sparc/SparcTargetMachine.h

@@ -30,7 +30,9 @@ public:
                      CodeGenOpt::Level OL, bool is64bit);
   ~SparcTargetMachine() override;
 
-  const SparcSubtarget *getSubtargetImpl() const override { return &Subtarget; }
+  const SparcSubtarget *getSubtargetImpl(const Function &) const override {
+    return &Subtarget;
+  }
 
   // Pass Pipeline Configuration
   TargetPassConfig *createPassConfig(PassManagerBase &PM) override;

lib/Target/SystemZ/SystemZTargetMachine.h

@@ -33,7 +33,8 @@ public:
                        CodeGenOpt::Level OL);
   ~SystemZTargetMachine() override;
 
-  const SystemZSubtarget *getSubtargetImpl() const override {
+  const SystemZSubtarget *getSubtargetImpl() const { return &Subtarget; }
+  const SystemZSubtarget *getSubtargetImpl(const Function &) const override {
     return &Subtarget;
   }
   // Override LLVMTargetMachine

lib/Target/XCore/XCoreTargetMachine.h

@@ -29,7 +29,10 @@ public:
                      CodeGenOpt::Level OL);
   ~XCoreTargetMachine() override;
 
-  const XCoreSubtarget *getSubtargetImpl() const override { return &Subtarget; }
+  const XCoreSubtarget *getSubtargetImpl() const { return &Subtarget; }
+  const XCoreSubtarget *getSubtargetImpl(const Function &) const override {
+    return &Subtarget;
+  }
 
   // Pass Pipeline Configuration
   TargetPassConfig *createPassConfig(PassManagerBase &PM) override;