249 lines
11 KiB
C++
249 lines
11 KiB
C++
//==- llvm/CodeGen/SelectionDAGTargetInfo.h - SelectionDAG Info --*- C++ -*-==//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file declares the SelectionDAGTargetInfo class, which targets can
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// subclass to parameterize the SelectionDAG lowering and instruction
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// selection process.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CODEGEN_SELECTIONDAGTARGETINFO_H
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#define LLVM_CODEGEN_SELECTIONDAGTARGETINFO_H
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#include "llvm/CodeGen/MachineMemOperand.h"
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#include "llvm/CodeGen/SDNodeInfo.h"
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#include "llvm/CodeGen/SelectionDAGNodes.h"
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#include "llvm/Support/CodeGen.h"
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#include <utility>
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namespace llvm {
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class CallInst;
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class SelectionDAG;
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//===----------------------------------------------------------------------===//
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/// Targets can subclass this to parameterize the
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/// SelectionDAG lowering and instruction selection process.
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///
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class LLVM_ABI SelectionDAGTargetInfo {
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public:
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explicit SelectionDAGTargetInfo() = default;
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SelectionDAGTargetInfo(const SelectionDAGTargetInfo &) = delete;
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SelectionDAGTargetInfo &operator=(const SelectionDAGTargetInfo &) = delete;
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virtual ~SelectionDAGTargetInfo();
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/// Returns the name of the given target-specific opcode, suitable for
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/// debug printing.
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virtual const char *getTargetNodeName(unsigned Opcode) const {
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return nullptr;
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}
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/// Returns true if a node with the given target-specific opcode has
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/// a memory operand. Nodes with such opcodes can only be created with
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/// `SelectionDAG::getMemIntrinsicNode`.
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virtual bool isTargetMemoryOpcode(unsigned Opcode) const { return false; }
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/// Returns true if a node with the given target-specific opcode has
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/// strict floating-point semantics.
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virtual bool isTargetStrictFPOpcode(unsigned Opcode) const { return false; }
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/// Returns true if a node with the given target-specific opcode
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/// may raise a floating-point exception.
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virtual bool mayRaiseFPException(unsigned Opcode) const;
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/// Checks that the given target-specific node is valid. Aborts if it is not.
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virtual void verifyTargetNode(const SelectionDAG &DAG,
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const SDNode *N) const {}
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/// Emit target-specific code that performs a memcpy.
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/// This can be used by targets to provide code sequences for cases
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/// that don't fit the target's parameters for simple loads/stores and can be
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/// more efficient than using a library call. This function can return a null
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/// SDValue if the target declines to use custom code and a different
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/// lowering strategy should be used.
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///
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/// If AlwaysInline is true, the size is constant and the target should not
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/// emit any calls and is strongly encouraged to attempt to emit inline code
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/// even if it is beyond the usual threshold because this intrinsic is being
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/// expanded in a place where calls are not feasible (e.g. within the prologue
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/// for another call). If the target chooses to decline an AlwaysInline
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/// request here, legalize will resort to using simple loads and stores.
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virtual SDValue EmitTargetCodeForMemcpy(SelectionDAG &DAG, const SDLoc &dl,
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SDValue Chain, SDValue Op1,
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SDValue Op2, SDValue Op3,
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Align DstAlign, Align SrcAlign,
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bool isVolatile, bool AlwaysInline,
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MachinePointerInfo DstPtrInfo,
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MachinePointerInfo SrcPtrInfo) const {
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return SDValue();
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}
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/// Emit target-specific code that performs a memmove.
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/// This can be used by targets to provide code sequences for cases
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/// that don't fit the target's parameters for simple loads/stores and can be
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/// more efficient than using a library call. This function can return a null
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/// SDValue if the target declines to use custom code and a different
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/// lowering strategy should be used.
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virtual SDValue EmitTargetCodeForMemmove(
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SelectionDAG &DAG, const SDLoc &dl, SDValue Chain, SDValue Op1,
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SDValue Op2, SDValue Op3, Align DstAlign, Align SrcAlign, bool isVolatile,
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MachinePointerInfo DstPtrInfo, MachinePointerInfo SrcPtrInfo) const {
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return SDValue();
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}
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/// Emit target-specific code that performs a memset.
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/// This can be used by targets to provide code sequences for cases
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/// that don't fit the target's parameters for simple stores and can be more
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/// efficient than using a library call. This function can return a null
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/// SDValue if the target declines to use custom code and a different
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/// lowering strategy should be used. Note that if AlwaysInline is true the
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/// function has to return a valid SDValue.
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virtual SDValue EmitTargetCodeForMemset(SelectionDAG &DAG, const SDLoc &dl,
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SDValue Chain, SDValue Op1,
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SDValue Op2, SDValue Op3,
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Align Alignment, bool isVolatile,
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bool AlwaysInline,
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MachinePointerInfo DstPtrInfo) const {
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return SDValue();
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}
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/// Emit target-specific code that performs a strstr, in cases where that is
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/// faster than a libcall. The first returned SDValue is the result of the
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/// strstr and the second is the chain. Both SDValues can be null if a normal
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/// libcall should be used.
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virtual std::pair<SDValue, SDValue>
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EmitTargetCodeForStrstr(SelectionDAG &DAG, const SDLoc &dl, SDValue Chain,
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SDValue Op1, SDValue Op2, const CallInst *CI) const {
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return std::make_pair(SDValue(), SDValue());
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}
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/// Emit target-specific code that performs a memccpy, in cases where that is
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/// faster than a libcall. The first returned SDValue is the result of the
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/// memccpy and the second is the chain. Both SDValues can be null if a normal
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/// libcall should be used.
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virtual std::pair<SDValue, SDValue>
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EmitTargetCodeForMemccpy(SelectionDAG &DAG, const SDLoc &dl, SDValue Chain,
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SDValue Dst, SDValue Src, SDValue C, SDValue Size,
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const CallInst *CI) const {
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return std::make_pair(SDValue(), SDValue());
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}
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/// Emit target-specific code that performs a memcmp/bcmp, in cases where that is
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/// faster than a libcall. The first returned SDValue is the result of the
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/// memcmp and the second is the chain. Both SDValues can be null if a normal
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/// libcall should be used.
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virtual std::pair<SDValue, SDValue>
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EmitTargetCodeForMemcmp(SelectionDAG &DAG, const SDLoc &dl, SDValue Chain,
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SDValue Op1, SDValue Op2, SDValue Op3,
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const CallInst *CI) const {
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return std::make_pair(SDValue(), SDValue());
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}
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/// Emit target-specific code that performs a memchr, in cases where that is
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/// faster than a libcall. The first returned SDValue is the result of the
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/// memchr and the second is the chain. Both SDValues can be null if a normal
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/// libcall should be used.
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virtual std::pair<SDValue, SDValue>
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EmitTargetCodeForMemchr(SelectionDAG &DAG, const SDLoc &dl, SDValue Chain,
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SDValue Src, SDValue Char, SDValue Length,
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MachinePointerInfo SrcPtrInfo) const {
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return std::make_pair(SDValue(), SDValue());
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}
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/// Emit target-specific code that performs a strcpy or stpcpy, in cases
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/// where that is faster than a libcall.
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/// The first returned SDValue is the result of the copy (the start
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/// of the destination string for strcpy, a pointer to the null terminator
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/// for stpcpy) and the second is the chain. Both SDValues can be null
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/// if a normal libcall should be used.
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virtual std::pair<SDValue, SDValue> EmitTargetCodeForStrcpy(
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SelectionDAG &DAG, const SDLoc &DL, SDValue Chain, SDValue Dest,
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SDValue Src, MachinePointerInfo DestPtrInfo,
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MachinePointerInfo SrcPtrInfo, bool isStpcpy, const CallInst *CI) const {
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return std::make_pair(SDValue(), SDValue());
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}
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/// Emit target-specific code that performs a strcmp, in cases where that is
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/// faster than a libcall.
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/// The first returned SDValue is the result of the strcmp and the second is
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/// the chain. Both SDValues can be null if a normal libcall should be used.
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virtual std::pair<SDValue, SDValue> EmitTargetCodeForStrcmp(
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SelectionDAG &DAG, const SDLoc &dl, SDValue Chain, SDValue Op1,
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SDValue Op2, MachinePointerInfo Op1PtrInfo, MachinePointerInfo Op2PtrInfo,
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const CallInst *CI) const {
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return std::make_pair(SDValue(), SDValue());
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}
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virtual std::pair<SDValue, SDValue>
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EmitTargetCodeForStrlen(SelectionDAG &DAG, const SDLoc &DL, SDValue Chain,
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SDValue Src, const CallInst *CI) const {
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return std::make_pair(SDValue(), SDValue());
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}
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virtual std::pair<SDValue, SDValue>
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EmitTargetCodeForStrnlen(SelectionDAG &DAG, const SDLoc &DL, SDValue Chain,
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SDValue Src, SDValue MaxLength,
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MachinePointerInfo SrcPtrInfo) const {
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return std::make_pair(SDValue(), SDValue());
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}
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virtual SDValue EmitTargetCodeForSetTag(SelectionDAG &DAG, const SDLoc &dl,
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SDValue Chain, SDValue Addr,
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SDValue Size,
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MachinePointerInfo DstPtrInfo,
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bool ZeroData) const {
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return SDValue();
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}
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// Return true if the DAG Combiner should disable generic combines.
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virtual bool disableGenericCombines(CodeGenOptLevel OptLevel) const {
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return false;
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}
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};
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/// Proxy class that targets should inherit from if they wish to use
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/// the generated node descriptions.
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class LLVM_ABI SelectionDAGGenTargetInfo : public SelectionDAGTargetInfo {
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protected:
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const SDNodeInfo &GenNodeInfo;
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explicit SelectionDAGGenTargetInfo(const SDNodeInfo &GenNodeInfo)
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: GenNodeInfo(GenNodeInfo) {}
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public:
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~SelectionDAGGenTargetInfo() override;
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const char *getTargetNodeName(unsigned Opcode) const override {
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assert(GenNodeInfo.hasDesc(Opcode) &&
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"The name should be provided by the derived class");
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return GenNodeInfo.getName(Opcode).data();
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}
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bool isTargetMemoryOpcode(unsigned Opcode) const override {
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if (GenNodeInfo.hasDesc(Opcode))
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return GenNodeInfo.getDesc(Opcode).hasProperty(SDNPMemOperand);
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return false;
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}
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bool isTargetStrictFPOpcode(unsigned Opcode) const override {
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if (GenNodeInfo.hasDesc(Opcode))
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return GenNodeInfo.getDesc(Opcode).hasFlag(SDNFIsStrictFP);
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return false;
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}
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void verifyTargetNode(const SelectionDAG &DAG,
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const SDNode *N) const override {
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if (GenNodeInfo.hasDesc(N->getOpcode()))
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GenNodeInfo.verifyNode(DAG, N);
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}
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};
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} // end namespace llvm
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#endif // LLVM_CODEGEN_SELECTIONDAGTARGETINFO_H
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