Convert the TargetTransformInfo from an immutable pass with dynamic

interfaces which could be extracted from it, and must be provided on
construction, to a chained analysis group.

The end goal here is that TTI works much like AA -- there is a baseline
"no-op" and target independent pass which is in the group, and each
target can expose a target-specific pass in the group. These passes will
naturally chain allowing each target-specific pass to delegate to the
generic pass as needed.

In particular, this will allow a much simpler interface for passes that
would like to use TTI -- they can have a hard dependency on TTI and it
will just be satisfied by the stub implementation when that is all that
is available.

This patch is a WIP however. In particular, the "stub" pass is actually
the one and only pass, and everything there is implemented by delegating
to the target-provided interfaces. As a consequence the tools still have
to explicitly construct the pass. Switching targets to provide custom
passes and sinking the stub behavior into the NoTTI pass is the next
step.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@171621 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 247 insertions, 15 deletions

diff --git a/lib/IR/TargetTransformInfo.cpp b/lib/IR/TargetTransformInfo.cpp
index 209e1dba8f..8d5fb0d40b 100644
--- a/lib/IR/TargetTransformInfo.cpp
+++ b/lib/IR/TargetTransformInfo.cpp
@@ -12,20 +12,252 @@
 
 using namespace llvm;
 
-/// Default ctor.
-///
-/// @note This has to exist, because this is a pass, but it should never be
-/// used.
-TargetTransformInfo::TargetTransformInfo() : ImmutablePass(ID) {
-  /// You are seeing this error because your pass required the TTI
-  /// using a call to "getAnalysis<TargetTransformInfo>()", and you did
-  /// not initialize a machine target which can provide the TTI.
-  /// You should use "getAnalysisIfAvailable<TargetTransformInfo>()" instead.
-  report_fatal_error("Bad TargetTransformInfo ctor used.  "
-                     "Tool did not specify a TargetTransformInfo to use?");
-}
-
-INITIALIZE_PASS(TargetTransformInfo, "targettransforminfo",
-                "Target Transform Info", false, true)
+// Setup the analysis group to manage the TargetTransformInfo passes.
+INITIALIZE_ANALYSIS_GROUP(TargetTransformInfo, "Target Information", NoTTI)
 char TargetTransformInfo::ID = 0;
 
+TargetTransformInfo::~TargetTransformInfo() {
+}
+
+void TargetTransformInfo::getAnalysisUsage(AnalysisUsage &AU) const {
+  AU.addRequired<TargetTransformInfo>();
+}
+
+bool TargetTransformInfo::isLegalAddImmediate(int64_t Imm) const {
+  return PrevTTI->isLegalAddImmediate(Imm);
+}
+
+bool TargetTransformInfo::isLegalICmpImmediate(int64_t Imm) const {
+  return PrevTTI->isLegalICmpImmediate(Imm);
+}
+
+bool TargetTransformInfo::isLegalAddressingMode(Type *Ty, GlobalValue *BaseGV,
+                                                int64_t BaseOffset,
+                                                bool HasBaseReg,
+                                                int64_t Scale) const {
+  return PrevTTI->isLegalAddressingMode(Ty, BaseGV, BaseOffset, HasBaseReg,
+                                        Scale);
+}
+
+bool TargetTransformInfo::isTruncateFree(Type *Ty1, Type *Ty2) const {
+  return PrevTTI->isTruncateFree(Ty1, Ty2);
+}
+
+bool TargetTransformInfo::isTypeLegal(Type *Ty) const {
+  return PrevTTI->isTypeLegal(Ty);
+}
+
+unsigned TargetTransformInfo::getJumpBufAlignment() const {
+  return PrevTTI->getJumpBufAlignment();
+}
+
+unsigned TargetTransformInfo::getJumpBufSize() const {
+  return PrevTTI->getJumpBufSize();
+}
+
+bool TargetTransformInfo::shouldBuildLookupTables() const {
+  return PrevTTI->shouldBuildLookupTables();
+}
+
+TargetTransformInfo::PopcntHwSupport
+TargetTransformInfo::getPopcntHwSupport(unsigned IntTyWidthInBit) const {
+  return PrevTTI->getPopcntHwSupport(IntTyWidthInBit);
+}
+
+unsigned TargetTransformInfo::getIntImmCost(const APInt &Imm, Type *Ty) const {
+  return PrevTTI->getIntImmCost(Imm, Ty);
+}
+
+unsigned TargetTransformInfo::getNumberOfRegisters(bool Vector) const {
+  return PrevTTI->getNumberOfRegisters(Vector);
+}
+
+unsigned TargetTransformInfo::getArithmeticInstrCost(unsigned Opcode,
+                                                     Type *Ty) const {
+  return PrevTTI->getArithmeticInstrCost(Opcode, Ty);
+}
+
+unsigned TargetTransformInfo::getShuffleCost(ShuffleKind Kind, Type *Tp,
+                                             int Index, Type *SubTp) const {
+  return PrevTTI->getShuffleCost(Kind, Tp, Index, SubTp);
+}
+
+unsigned TargetTransformInfo::getCastInstrCost(unsigned Opcode, Type *Dst,
+                                               Type *Src) const {
+  return PrevTTI->getCastInstrCost(Opcode, Dst, Src);
+}
+
+unsigned TargetTransformInfo::getCFInstrCost(unsigned Opcode) const {
+  return PrevTTI->getCFInstrCost(Opcode);
+}
+
+unsigned TargetTransformInfo::getCmpSelInstrCost(unsigned Opcode, Type *ValTy,
+                                                 Type *CondTy) const {
+  return PrevTTI->getCmpSelInstrCost(Opcode, ValTy, CondTy);
+}
+
+unsigned TargetTransformInfo::getVectorInstrCost(unsigned Opcode, Type *Val,
+                                                 unsigned Index) const {
+  return PrevTTI->getVectorInstrCost(Opcode, Val, Index);
+}
+
+unsigned TargetTransformInfo::getMemoryOpCost(unsigned Opcode, Type *Src,
+                                              unsigned Alignment,
+                                              unsigned AddressSpace) const {
+  return PrevTTI->getMemoryOpCost(Opcode, Src, Alignment, AddressSpace);
+  ;
+}
+
+unsigned
+TargetTransformInfo::getIntrinsicInstrCost(Intrinsic::ID ID,
+                                           Type *RetTy,
+                                           ArrayRef<Type *> Tys) const {
+  return PrevTTI->getIntrinsicInstrCost(ID, RetTy, Tys);
+}
+
+unsigned TargetTransformInfo::getNumberOfParts(Type *Tp) const {
+  return PrevTTI->getNumberOfParts(Tp);
+}
+
+
+namespace {
+
+class NoTTI : public ImmutablePass, public TargetTransformInfo {
+  const ScalarTargetTransformInfo *STTI;
+  const VectorTargetTransformInfo *VTTI;
+
+public:
+  // FIXME: This constructor doesn't work which breaks the use of NoTTI on the
+  // commandline. This has to be fixed for NoTTI to be fully usable as an
+  // analysis pass.
+  NoTTI() : ImmutablePass(ID), TargetTransformInfo(0) {
+    llvm_unreachable("Unsupported code path!");
+  }
+
+  NoTTI(const ScalarTargetTransformInfo *S, const VectorTargetTransformInfo *V)
+      : ImmutablePass(ID),
+        TargetTransformInfo(0), // NoTTI is special and doesn't delegate here.
+        STTI(S), VTTI(V) {
+    initializeNoTTIPass(*PassRegistry::getPassRegistry());
+  }
+
+  void getAnalysisUsage(AnalysisUsage &AU) const {
+    // Note that this subclass is special, and must *not* call
+    // TTI::getAnalysisUsage as it breaks the recursion.
+  }
+
+  /// Pass identification.
+  static char ID;
+
+  /// Provide necessary pointer adjustments for the two base classes.
+  virtual void *getAdjustedAnalysisPointer(const void *ID) {
+    if (ID == &TargetTransformInfo::ID)
+      return (TargetTransformInfo*)this;
+    return this;
+  }
+
+
+  // Delegate all predicates through the STTI or VTTI interface.
+
+  bool isLegalAddImmediate(int64_t Imm) const {
+    return STTI->isLegalAddImmediate(Imm);
+  }
+
+  bool isLegalICmpImmediate(int64_t Imm) const {
+    return STTI->isLegalICmpImmediate(Imm);
+  }
+
+  bool isLegalAddressingMode(Type *Ty, GlobalValue *BaseGV, int64_t BaseOffset,
+                             bool HasBaseReg, int64_t Scale) const {
+    return STTI->isLegalAddressingMode(Ty, BaseGV, BaseOffset, HasBaseReg,
+                                       Scale);
+  }
+
+  bool isTruncateFree(Type *Ty1, Type *Ty2) const {
+    return STTI->isTruncateFree(Ty1, Ty2);
+  }
+
+  bool isTypeLegal(Type *Ty) const {
+    return STTI->isTypeLegal(Ty);
+  }
+
+  unsigned getJumpBufAlignment() const {
+    return STTI->getJumpBufAlignment();
+  }
+
+  unsigned getJumpBufSize() const {
+    return STTI->getJumpBufSize();
+  }
+
+  bool shouldBuildLookupTables() const {
+    return STTI->shouldBuildLookupTables();
+  }
+
+  PopcntHwSupport getPopcntHwSupport(unsigned IntTyWidthInBit) const {
+    return (PopcntHwSupport)STTI->getPopcntHwSupport(IntTyWidthInBit);
+  }
+
+  unsigned getIntImmCost(const APInt &Imm, Type *Ty) const {
+    return STTI->getIntImmCost(Imm, Ty);
+  }
+
+  unsigned getNumberOfRegisters(bool Vector) const {
+    return VTTI->getNumberOfRegisters(Vector);
+  }
+
+  unsigned getArithmeticInstrCost(unsigned Opcode, Type *Ty) const {
+    return VTTI->getArithmeticInstrCost(Opcode, Ty);
+  }
+
+  unsigned getShuffleCost(ShuffleKind Kind, Type *Tp,
+                          int Index = 0, Type *SubTp = 0) const {
+    return VTTI->getShuffleCost((VectorTargetTransformInfo::ShuffleKind)Kind,
+                                Tp, Index, SubTp);
+  }
+
+  unsigned getCastInstrCost(unsigned Opcode, Type *Dst,
+                            Type *Src) const {
+    return VTTI->getCastInstrCost(Opcode, Dst, Src);
+  }
+
+  unsigned getCFInstrCost(unsigned Opcode) const {
+    return VTTI->getCFInstrCost(Opcode);
+  }
+
+  unsigned getCmpSelInstrCost(unsigned Opcode, Type *ValTy,
+                              Type *CondTy = 0) const {
+    return VTTI->getCmpSelInstrCost(Opcode, ValTy, CondTy);
+  }
+
+  unsigned getVectorInstrCost(unsigned Opcode, Type *Val,
+                              unsigned Index = -1) const {
+    return VTTI->getVectorInstrCost(Opcode, Val, Index);
+  }
+
+  unsigned getMemoryOpCost(unsigned Opcode, Type *Src,
+                           unsigned Alignment,
+                           unsigned AddressSpace) const {
+    return VTTI->getMemoryOpCost(Opcode, Src, Alignment, AddressSpace);
+  }
+
+  unsigned getIntrinsicInstrCost(Intrinsic::ID ID,
+                                 Type *RetTy,
+                                 ArrayRef<Type*> Tys) const {
+    return VTTI->getIntrinsicInstrCost(ID, RetTy, Tys);
+  }
+
+  unsigned getNumberOfParts(Type *Tp) const {
+    return VTTI->getNumberOfParts(Tp);
+  }
+};
+
+} // end anonymous namespace
+
+INITIALIZE_AG_PASS(NoTTI, TargetTransformInfo, "no-tti",
+                   "No target information", true, true, true)
+char NoTTI::ID = 0;
+
+ImmutablePass *llvm::createNoTTIPass(const ScalarTargetTransformInfo *S,
+                                     const VectorTargetTransformInfo *V) {
+  return new NoTTI(S, V);
+}