[AArch64] Add support for TargetTransformInfo Analysis.

llvm-svn: 201793

lib/Target/AArch64/AArch64.h

@@ -33,6 +33,10 @@ FunctionPass *createAArch64CleanupLocalDynamicTLSPass();
 
 FunctionPass *createAArch64BranchFixupPass();
 
+/// \brief Creates an AArch64-specific Target Transformation Info pass.
+ImmutablePass *createAArch64TargetTransformInfoPass(
+                                                const AArch64TargetMachine *TM);
+
 void LowerAArch64MachineInstrToMCInst(const MachineInstr *MI, MCInst &OutMI,
                                       AArch64AsmPrinter &AP);
 

lib/Target/AArch64/AArch64TargetMachine.cpp

@@ -41,6 +41,14 @@ AArch64TargetMachine::AArch64TargetMachine(const Target &T, StringRef TT,
   initAsmInfo();
 }
 
+void AArch64TargetMachine::addAnalysisPasses(PassManagerBase &PM) {
+  // Add first the target-independent BasicTTI pass, then our AArch64 pass. This
+  // allows the AArch64 pass to delegate to the target independent layer when
+  // appropriate.
+  PM.add(createBasicTargetTransformInfoPass(this));
+  PM.add(createAArch64TargetTransformInfoPass(this));
+}
+
 namespace {
 /// AArch64 Code Generator Pass Configuration Options.
 class AArch64PassConfig : public TargetPassConfig {

lib/Target/AArch64/AArch64TargetMachine.h

@@ -62,6 +62,8 @@ public:
     return &InstrInfo.getRegisterInfo();
   }
   TargetPassConfig *createPassConfig(PassManagerBase &PM);
+
+  virtual void addAnalysisPasses(PassManagerBase &PM);
 };
 
 }

lib/Target/AArch64/AArch64TargetTransformInfo.cpp

@@ -0,0 +1,116 @@
+//===- AArch64TargetTransformInfo.cpp - AArch64 specific TTI pass ---------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+/// \file
+/// This file implements a TargetTransformInfo analysis pass specific to the
+/// AArch64 target machine. It uses the target's detailed information to provide
+/// more precise answers to certain TTI queries, while letting the target
+/// independent and default TTI implementations handle the rest.
+///
+//===----------------------------------------------------------------------===//
+
+#define DEBUG_TYPE "aarch64tti"
+#include "AArch64.h"
+#include "AArch64TargetMachine.h"
+#include "llvm/Analysis/TargetTransformInfo.h"
+#include "llvm/Support/Debug.h"
+#include "llvm/Target/CostTable.h"
+#include "llvm/Target/TargetLowering.h"
+using namespace llvm;
+
+// Declare the pass initialization routine locally as target-specific passes
+// don't have a target-wide initialization entry point, and so we rely on the
+// pass constructor initialization.
+namespace llvm {
+void initializeAArch64TTIPass(PassRegistry &);
+}
+
+namespace {
+
+class AArch64TTI LLVM_FINAL : public ImmutablePass, public TargetTransformInfo {
+  const AArch64TargetMachine *TM;
+  const AArch64Subtarget *ST;
+  const AArch64TargetLowering *TLI;
+
+  /// Estimate the overhead of scalarizing an instruction. Insert and Extract
+  /// are set if the result needs to be inserted and/or extracted from vectors.
+  unsigned getScalarizationOverhead(Type *Ty, bool Insert, bool Extract) const;
+
+public:
+  AArch64TTI() : ImmutablePass(ID), TM(0), ST(0), TLI(0) {
+    llvm_unreachable("This pass cannot be directly constructed");
+  }
+
+  AArch64TTI(const AArch64TargetMachine *TM)
+      : ImmutablePass(ID), TM(TM), ST(TM->getSubtargetImpl()),
+        TLI(TM->getTargetLowering()) {
+    initializeAArch64TTIPass(*PassRegistry::getPassRegistry());
+  }
+
+  virtual void initializePass() LLVM_OVERRIDE {
+    pushTTIStack(this);
+  }
+
+  virtual void finalizePass() {
+    popTTIStack();
+  }
+
+  virtual void getAnalysisUsage(AnalysisUsage &AU) const LLVM_OVERRIDE {
+    TargetTransformInfo::getAnalysisUsage(AU);
+  }
+
+  /// Pass identification.
+  static char ID;
+
+  /// Provide necessary pointer adjustments for the two base classes.
+  virtual void *getAdjustedAnalysisPointer(const void *ID) LLVM_OVERRIDE {
+    if (ID == &TargetTransformInfo::ID)
+      return (TargetTransformInfo*)this;
+    return this;
+  }
+
+  /// \name Scalar TTI Implementations
+  /// @{
+
+  /// @}
+
+
+  /// \name Vector TTI Implementations
+  /// @{
+
+  unsigned getNumberOfRegisters(bool Vector) const {
+    if (Vector) {
+      if (ST->hasNEON())
+        return 32;
+      return 0;
+    }
+    return 32;
+  }
+
+  unsigned getRegisterBitWidth(bool Vector) const {
+    if (Vector) {
+      if (ST->hasNEON())
+        return 128;
+      return 0;
+    }
+    return 64;
+  }
+
+  /// @}
+};
+
+} // end anonymous namespace
+
+INITIALIZE_AG_PASS(AArch64TTI, TargetTransformInfo, "aarch64tti",
+                   "AArch64 Target Transform Info", true, true, false)
+char AArch64TTI::ID = 0;
+
+ImmutablePass *
+llvm::createAArch64TargetTransformInfoPass(const AArch64TargetMachine *TM) {
+  return new AArch64TTI(TM);
+}

lib/Target/AArch64/CMakeLists.txt

@@ -26,6 +26,7 @@ add_llvm_target(AArch64CodeGen
   AArch64Subtarget.cpp
   AArch64TargetMachine.cpp
   AArch64TargetObjectFile.cpp
+  AArch64TargetTransformInfo.cpp
   )
 
 add_subdirectory(AsmParser)