Implement a basic VectorTargetTransformInfo interface to be used by the loop and bb vectorizers for modeling the cost of instructions.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166593 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Target/TargetTransformImpl.h

@@ -47,7 +47,23 @@ public:
   virtual unsigned getJumpBufSize() const;
 };
 
-class VectorTargetTransformImpl : public VectorTargetTransformInfo { };
+class VectorTargetTransformImpl : public VectorTargetTransformInfo {
+private:
+  const TargetLowering *TLI;
+
+public:
+  explicit VectorTargetTransformImpl(const TargetLowering *TL) : TLI(TL) {}
+  
+  virtual ~VectorTargetTransformImpl() {}
+
+  virtual unsigned getInstrCost(unsigned Opcode, Type *Ty1, Type *Ty2) const;
+
+  virtual unsigned getBroadcastCost(Type *Tp) const;
+
+  virtual unsigned getMemoryOpCost(unsigned Opcode, Type *Src,
+                                   unsigned Alignment,
+                                   unsigned AddressSpace) const;
+};
 
 } // end llvm namespace
 

include/llvm/TargetTransformInfo.h

@@ -54,10 +54,10 @@ public:
   TargetTransformInfo(const TargetTransformInfo &T) :
     ImmutablePass(ID), STTI(T.STTI), VTTI(T.VTTI) { }
 
-  const ScalarTargetTransformInfo* getScalarTargetTransformInfo() {
+  const ScalarTargetTransformInfo* getScalarTargetTransformInfo() const {
     return STTI;
   }
-  const VectorTargetTransformInfo* getVectorTargetTransformInfo() {
+  const VectorTargetTransformInfo* getVectorTargetTransformInfo() const {
     return VTTI;
   }
 
@@ -119,8 +119,43 @@ public:
   }
 };
 
+/// VectorTargetTransformInfo - This interface is used by the vectorizers
+/// to estimate the profitability of vectorization for different instructions.
 class VectorTargetTransformInfo {
-  // TODO: define an interface for VectorTargetTransformInfo.
+public:
+  virtual ~VectorTargetTransformInfo() {}
+
+  /// Returns the expected cost of the instruction opcode. The opcode is one of
+  /// the enums like Instruction::Add. The type arguments are the type of the
+  /// operation.
+  /// Most instructions only use the first type and in that case the second
+  /// operand is ignored.
+  ///
+  /// Exceptions:
+  /// * Br instructions do not use any of the types.
+  /// * Select instructions pass the return type as Ty1 and the selector as Ty2.
+  /// * Cast instructions pass the destination as Ty1 and the source as Ty2.
+  /// * Insert/Extract element pass only the vector type as Ty1.
+  /// * ShuffleVector, Load, Store do not use this call.
+  virtual unsigned getInstrCost(unsigned Opcode,
+                                Type *Ty1 = 0,
+                                Type *Ty2 = 0) const {
+    return 1;
+  }
+
+  /// Returns the cost of a vector broadcast of a scalar at place zero to a
+  /// vector of type 'Tp'.
+  virtual unsigned getBroadcastCost(Type *Tp) const {
+    return 1;
+  }
+
+  /// Returns the cost of Load and Store instructions. 
+  virtual unsigned getMemoryOpCost(unsigned Opcode, Type *Src,
+                                   unsigned Alignment,
+                                   unsigned AddressSpace) const {
+    return 1;
+  }
+
 };
 
 } // End llvm namespace

lib/Target/ARM/ARMTargetMachine.cpp

@@ -72,7 +72,7 @@ ARMTargetMachine::ARMTargetMachine(const Target &T, StringRef TT,
     TLInfo(*this),
     TSInfo(*this),
     FrameLowering(Subtarget),
-    STTI(&TLInfo) {
+    STTI(&TLInfo), VTTI(&TLInfo) {
   if (!Subtarget.hasARMOps())
     report_fatal_error("CPU: '" + Subtarget.getCPUString() + "' does not "
                        "support ARM mode execution!");
@@ -106,7 +106,7 @@ ThumbTargetMachine::ThumbTargetMachine(const Target &T, StringRef TT,
     FrameLowering(Subtarget.hasThumb2()
               ? new ARMFrameLowering(Subtarget)
               : (ARMFrameLowering*)new Thumb1FrameLowering(Subtarget)),
-    STTI(&TLInfo){
+    STTI(&TLInfo), VTTI(&TLInfo) {
 }
 
 namespace {

lib/Target/CellSPU/SPUTargetMachine.cpp

@@ -44,7 +44,7 @@ SPUTargetMachine::SPUTargetMachine(const Target &T, StringRef TT,
     TLInfo(*this),
     TSInfo(*this),
     InstrItins(Subtarget.getInstrItineraryData()),
-    STTI(&TLInfo){
+    STTI(&TLInfo), VTTI(&TLInfo) {
 }
 
 //===----------------------------------------------------------------------===//

lib/Target/Hexagon/HexagonTargetMachine.cpp

@@ -75,7 +75,7 @@ HexagonTargetMachine::HexagonTargetMachine(const Target &T, StringRef TT,
     TSInfo(*this),
     FrameLowering(Subtarget),
     InstrItins(&Subtarget.getInstrItineraryData()),
-    STTI(&TLInfo) {
+    STTI(&TLInfo), VTTI(&TLInfo) {
   setMCUseCFI(false);
 }
 

lib/Target/MBlaze/MBlazeTargetMachine.cpp

@@ -42,7 +42,8 @@ MBlazeTargetMachine(const Target &T, StringRef TT,
     InstrInfo(*this),
     FrameLowering(Subtarget),
     TLInfo(*this), TSInfo(*this), ELFWriterInfo(*this),
-    InstrItins(Subtarget.getInstrItineraryData()), STTI(&TLInfo) {
+    InstrItins(Subtarget.getInstrItineraryData()),
+    STTI(&TLInfo), VTTI(&TLInfo) {
 }
 
 namespace {

lib/Target/MSP430/MSP430TargetMachine.cpp

@@ -36,7 +36,7 @@ MSP430TargetMachine::MSP430TargetMachine(const Target &T,
     // FIXME: Check DataLayout string.
     DL("e-p:16:16:16-i8:8:8-i16:16:16-i32:16:32-n8:16"),
     InstrInfo(*this), TLInfo(*this), TSInfo(*this),
-    FrameLowering(Subtarget), STTI(&TLInfo) { }
+    FrameLowering(Subtarget), STTI(&TLInfo), VTTI(&TLInfo) { }
 
 namespace {
 /// MSP430 Code Generator Pass Configuration Options.

lib/Target/Mips/MipsTargetMachine.cpp

@@ -53,7 +53,7 @@ MipsTargetMachine(const Target &T, StringRef TT,
     InstrInfo(MipsInstrInfo::create(*this)),
     FrameLowering(MipsFrameLowering::create(*this, Subtarget)),
     TLInfo(*this), TSInfo(*this), JITInfo(),
-    ELFWriterInfo(false, isLittle), STTI(&TLInfo) {
+    ELFWriterInfo(false, isLittle), STTI(&TLInfo), VTTI(&TLInfo) {
 }
 
 void MipsebTargetMachine::anchor() { }

lib/Target/Mips/MipsTargetMachine.h

@@ -40,7 +40,7 @@ class MipsTargetMachine : public LLVMTargetMachine {
   MipsJITInfo JITInfo;
   MipsELFWriterInfo   ELFWriterInfo;
   ScalarTargetTransformImpl STTI;
-  VectorTargetTransformInfo VTTI; 
+  VectorTargetTransformImpl VTTI;
 
 public:
   MipsTargetMachine(const Target &T, StringRef TT,

lib/Target/NVPTX/NVPTXTargetMachine.cpp

@@ -73,7 +73,7 @@ NVPTXTargetMachine::NVPTXTargetMachine(const Target &T,
   Subtarget(TT, CPU, FS, is64bit),
   DL(Subtarget.getDataLayout()),
   InstrInfo(*this), TLInfo(*this), TSInfo(*this), FrameLowering(*this,is64bit),
-  STTI(&TLInfo)
+  STTI(&TLInfo), VTTI(&TLInfo)
 /*FrameInfo(TargetFrameInfo::StackGrowsUp, 8, 0)*/ {
 }
 

lib/Target/PowerPC/PPCTargetMachine.cpp

@@ -44,7 +44,7 @@ PPCTargetMachine::PPCTargetMachine(const Target &T, StringRef TT,
     FrameLowering(Subtarget), JITInfo(*this, is64Bit),
     TLInfo(*this), TSInfo(*this),
     InstrItins(Subtarget.getInstrItineraryData()),
-    STTI(&TLInfo){
+    STTI(&TLInfo), VTTI(&TLInfo) {
 
   // The binutils for the BG/P are too old for CFI.
   if (Subtarget.isBGP())

lib/Target/Sparc/SparcTargetMachine.cpp

@@ -36,7 +36,7 @@ SparcTargetMachine::SparcTargetMachine(const Target &T, StringRef TT,
     DL(Subtarget.getDataLayout()),
     InstrInfo(Subtarget),
     TLInfo(*this), TSInfo(*this),
-    FrameLowering(Subtarget),STTI(&TLInfo) {
+    FrameLowering(Subtarget), STTI(&TLInfo), VTTI(&TLInfo) {
 }
 
 namespace {

lib/Target/TargetTransformImpl.cpp

@@ -12,6 +12,12 @@
 
 using namespace llvm;
 
+//===----------------------------------------------------------------------===//
+//
+// Calls used by scalar transformations.
+//
+//===----------------------------------------------------------------------===//
+
 bool ScalarTargetTransformImpl::isLegalAddImmediate(int64_t imm) const {
   return TLI->isLegalAddImmediate(imm);
 }
@@ -41,3 +47,27 @@ unsigned ScalarTargetTransformImpl::getJumpBufAlignment() const {
 unsigned ScalarTargetTransformImpl::getJumpBufSize() const {
   return TLI->getJumpBufSize();
 }
+
+//===----------------------------------------------------------------------===//
+//
+// Calls used by the vectorizers.
+//
+//===----------------------------------------------------------------------===//
+
+unsigned
+VectorTargetTransformImpl::getInstrCost(unsigned Opcode, Type *Ty1,
+                                        Type *Ty2) const {
+  return 1;
+}
+
+unsigned
+VectorTargetTransformImpl::getBroadcastCost(Type *Tp) const {
+  return 1;
+}
+
+unsigned
+VectorTargetTransformImpl::getMemoryOpCost(unsigned Opcode, Type *Src,
+                                           unsigned Alignment,
+                                           unsigned AddressSpace) const {
+  return 1;
+}

lib/Target/X86/X86TargetMachine.cpp

@@ -49,7 +49,7 @@ X86_32TargetMachine::X86_32TargetMachine(const Target &T, StringRef TT,
     TSInfo(*this),
     TLInfo(*this),
     JITInfo(*this),
-    STTI(&TLInfo) {
+    STTI(&TLInfo), VTTI(&TLInfo) {
 }
 
 void X86_64TargetMachine::anchor() { }
@@ -66,7 +66,7 @@ X86_64TargetMachine::X86_64TargetMachine(const Target &T, StringRef TT,
     TSInfo(*this),
     TLInfo(*this),
     JITInfo(*this),
-    STTI(&TLInfo) {
+    STTI(&TLInfo), VTTI(&TLInfo){
 }
 
 /// X86TargetMachine ctor - Create an X86 target.

lib/Target/XCore/XCoreTargetMachine.cpp

@@ -32,7 +32,7 @@ XCoreTargetMachine::XCoreTargetMachine(const Target &T, StringRef TT,
     InstrInfo(),
     FrameLowering(Subtarget),
     TLInfo(*this),
-    TSInfo(*this), STTI(&TLInfo) {
+    TSInfo(*this), STTI(&TLInfo), VTTI(&TLInfo) {
 }
 
 namespace {