Reapply the TargerTransformInfo changes, minus the changes to LSR and Lowerinvoke.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166248 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 128 insertions, 0 deletions

diff --git a/include/llvm/TargetTransformInfo.h b/include/llvm/TargetTransformInfo.h
new file mode 100644
index 0000000..82fc14d
--- /dev/null
+++ b/include/llvm/TargetTransformInfo.h
@@ -0,0 +1,128 @@
+//===- llvm/Transforms/TargetTransformInfo.h --------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This pass exposes codegen information to IR-level passes. Every
+// transformation that uses codegen information is broken into three parts:
+// 1. The IR-level analysis pass.
+// 2. The IR-level transformation interface which provides the needed
+//    information.
+// 3. Codegen-level implementation which uses target-specific hooks.
+//
+// This file defines #2, which is the interface that IR-level transformations
+// use for querying the codegen.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_TRANSFORMS_TARGET_TRANSFORM_INTERFACE
+#define LLVM_TRANSFORMS_TARGET_TRANSFORM_INTERFACE
+
+#include "llvm/Pass.h"
+#include "llvm/AddressingMode.h"
+#include "llvm/Support/DataTypes.h"
+#include "llvm/Type.h"
+
+namespace llvm {
+
+class ScalarTargetTransformInfo;
+class VectorTargetTransformInfo;
+
+/// TargetTransformInfo - This pass provides access to the codegen
+/// interfaces that are needed for IR-level transformations.
+class TargetTransformInfo : public ImmutablePass {
+private:
+  const ScalarTargetTransformInfo *STTI;
+  const VectorTargetTransformInfo *VTTI;
+public:
+  /// Default ctor.
+  ///
+  /// @note This has to exist, because this is a pass, but it should never be
+  /// used.
+  TargetTransformInfo();
+
+  explicit TargetTransformInfo(const ScalarTargetTransformInfo* S,
+                               const VectorTargetTransformInfo *V)
+    : ImmutablePass(ID), STTI(S), VTTI(V) {
+      initializeTargetTransformInfoPass(*PassRegistry::getPassRegistry());
+    }
+
+  TargetTransformInfo(const TargetTransformInfo &T) :
+    ImmutablePass(ID), STTI(T.STTI), VTTI(T.VTTI) { }
+
+  const ScalarTargetTransformInfo* getScalarTargetTransformInfo() {
+    return STTI;
+  }
+  const VectorTargetTransformInfo* getVectorTargetTransformInfo() {
+    return VTTI;
+  }
+
+  /// Pass identification, replacement for typeid.
+  static char ID;
+};
+
+// ---------------------------------------------------------------------------//
+//  The classes below are inherited and implemented by target-specific classes
+//  in the codegen.
+// ---------------------------------------------------------------------------//
+
+/// ScalarTargetTransformInfo - This interface is used by IR-level passes
+/// that need target-dependent information for generic scalar transformations.
+/// LSR, and LowerInvoke use this interface.
+class ScalarTargetTransformInfo {
+public:
+  virtual ~ScalarTargetTransformInfo() {}
+
+  /// isLegalAddImmediate - Return true if the specified immediate is legal
+  /// add immediate, that is the target has add instructions which can add
+  /// a register with the immediate without having to materialize the
+  /// immediate into a register.
+  virtual bool isLegalAddImmediate(int64_t) const {
+    return false;
+  }
+  /// isLegalICmpImmediate - Return true if the specified immediate is legal
+  /// icmp immediate, that is the target has icmp instructions which can compare
+  /// a register against the immediate without having to materialize the
+  /// immediate into a register.
+  virtual bool isLegalICmpImmediate(int64_t) const {
+    return false;
+  }
+  /// isLegalAddressingMode - Return true if the addressing mode represented by
+  /// AM is legal for this target, for a load/store of the specified type.
+  /// The type may be VoidTy, in which case only return true if the addressing
+  /// mode is legal for a load/store of any legal type.
+  /// TODO: Handle pre/postinc as well.
+  virtual bool isLegalAddressingMode(const AddrMode &AM, Type *Ty) const {
+    return false;
+  }
+  /// isTruncateFree - Return true if it's free to truncate a value of
+  /// type Ty1 to type Ty2. e.g. On x86 it's free to truncate a i32 value in
+  /// register EAX to i16 by referencing its sub-register AX.
+  virtual bool isTruncateFree(Type * /*Ty1*/, Type * /*Ty2*/) const {
+    return false;
+  }
+  /// Is this type legal.
+  virtual bool isTypeLegal(Type *Ty) const {
+    return false;
+  }
+  /// getJumpBufAlignment - returns the target's jmp_buf alignment in bytes
+  virtual unsigned getJumpBufAlignment() const {
+    return 0;
+  }
+  /// getJumpBufSize - returns the target's jmp_buf size in bytes.
+  virtual unsigned getJumpBufSize() const {
+    return 0;
+  }
+};
+
+class VectorTargetTransformInfo {
+  // TODO: define an interface for VectorTargetTransformInfo.
+};
+
+} // End llvm namespace
+
+#endif