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-Wnon-virtual-dtor for real. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@165787 91177308-0d34-0410-b5e6-96231b3b80d8
129 lines
4.6 KiB
C++
129 lines
4.6 KiB
C++
//===- llvm/Transforms/TargetTransformInfo.h --------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This pass exposes codegen information to IR-level passes. Every
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// transformation that uses codegen information is broken into three parts:
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// 1. The IR-level analysis pass.
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// 2. The IR-level transformation interface which provides the needed
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// information.
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// 3. Codegen-level implementation which uses target-specific hooks.
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//
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// This file defines #2, which is the interface that IR-level transformations
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// use for querying the codegen.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_TRANSFORMS_TARGET_TRANSFORM_INTERFACE
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#define LLVM_TRANSFORMS_TARGET_TRANSFORM_INTERFACE
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#include "llvm/Pass.h"
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#include "llvm/AddressingMode.h"
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#include "llvm/Support/DataTypes.h"
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#include "llvm/Type.h"
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namespace llvm {
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class ScalarTargetTransformInfo;
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class VectorTargetTransformInfo;
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/// TargetTransformInfo - This pass provides access to the codegen
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/// interfaces that are needed for IR-level transformations.
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class TargetTransformInfo : public ImmutablePass {
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private:
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const ScalarTargetTransformInfo *STTI;
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const VectorTargetTransformInfo *VTTI;
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public:
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/// Default ctor.
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///
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/// @note This has to exist, because this is a pass, but it should never be
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/// used.
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TargetTransformInfo();
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explicit TargetTransformInfo(const ScalarTargetTransformInfo* S,
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const VectorTargetTransformInfo *V)
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: ImmutablePass(ID), STTI(S), VTTI(V) {
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initializeTargetTransformInfoPass(*PassRegistry::getPassRegistry());
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}
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TargetTransformInfo(const TargetTransformInfo &T) :
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ImmutablePass(ID), STTI(T.STTI), VTTI(T.VTTI) { }
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const ScalarTargetTransformInfo* getScalarTargetTransformInfo() {
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return STTI;
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}
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const VectorTargetTransformInfo* getVectorTargetTransformInfo() {
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return VTTI;
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}
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/// Pass identification, replacement for typeid.
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static char ID;
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};
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// ---------------------------------------------------------------------------//
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// The classes below are inherited and implemented by target-specific classes
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// in the codegen.
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// ---------------------------------------------------------------------------//
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/// ScalarTargetTransformInfo - This interface is used by IR-level passes
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/// that need target-dependent information for generic scalar transformations.
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/// LSR, and LowerInvoke use this interface.
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class ScalarTargetTransformInfo {
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public:
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virtual ~ScalarTargetTransformInfo() {}
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/// isLegalAddImmediate - Return true if the specified immediate is legal
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/// add immediate, that is the target has add instructions which can add
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/// a register with the immediate without having to materialize the
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/// immediate into a register.
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virtual bool isLegalAddImmediate(int64_t) const {
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return false;
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}
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/// isLegalICmpImmediate - Return true if the specified immediate is legal
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/// icmp immediate, that is the target has icmp instructions which can compare
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/// a register against the immediate without having to materialize the
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/// immediate into a register.
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virtual bool isLegalICmpImmediate(int64_t) const {
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return false;
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}
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/// isLegalAddressingMode - Return true if the addressing mode represented by
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/// AM is legal for this target, for a load/store of the specified type.
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/// The type may be VoidTy, in which case only return true if the addressing
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/// mode is legal for a load/store of any legal type.
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/// TODO: Handle pre/postinc as well.
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virtual bool isLegalAddressingMode(const AddrMode &AM, Type *Ty) const {
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return false;
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}
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/// isTruncateFree - Return true if it's free to truncate a value of
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/// type Ty1 to type Ty2. e.g. On x86 it's free to truncate a i32 value in
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/// register EAX to i16 by referencing its sub-register AX.
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virtual bool isTruncateFree(Type * /*Ty1*/, Type * /*Ty2*/) const {
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return false;
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}
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/// Is this type legal.
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virtual bool isTypeLegal(Type *Ty) const {
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return false;
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}
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/// getJumpBufAlignment - returns the target's jmp_buf alignment in bytes
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virtual unsigned getJumpBufAlignment() const {
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return 0;
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}
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/// getJumpBufSize - returns the target's jmp_buf size in bytes.
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virtual unsigned getJumpBufSize() const {
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return 0;
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}
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};
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class VectorTargetTransformInfo {
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// TODO: define an interface for VectorTargetTransformInfo.
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};
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} // End llvm namespace
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#endif
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