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27037aea90
Probing of allocated stack space is now done when this option is passed. The purpose is to protect against the stack clash attack (see https://www.qualys.com/2017/06/19/stack-clash/stack-clash.txt). Review: Ulrich Weigand Differential Revision: https://reviews.llvm.org/D78717
363 lines
15 KiB
C++
363 lines
15 KiB
C++
//===-- SystemZInstrInfo.h - SystemZ instruction information ----*- 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 contains the SystemZ implementation of the TargetInstrInfo class.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_TARGET_SYSTEMZ_SYSTEMZINSTRINFO_H
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#define LLVM_LIB_TARGET_SYSTEMZ_SYSTEMZINSTRINFO_H
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#include "SystemZ.h"
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#include "SystemZRegisterInfo.h"
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#include "llvm/ADT/ArrayRef.h"
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#include "llvm/CodeGen/MachineBasicBlock.h"
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/CodeGen/MachineInstrBuilder.h"
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#include "llvm/CodeGen/TargetInstrInfo.h"
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#include <cstdint>
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#define GET_INSTRINFO_HEADER
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#include "SystemZGenInstrInfo.inc"
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namespace llvm {
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class SystemZSubtarget;
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namespace SystemZII {
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enum {
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// See comments in SystemZInstrFormats.td.
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SimpleBDXLoad = (1 << 0),
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SimpleBDXStore = (1 << 1),
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Has20BitOffset = (1 << 2),
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HasIndex = (1 << 3),
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Is128Bit = (1 << 4),
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AccessSizeMask = (31 << 5),
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AccessSizeShift = 5,
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CCValuesMask = (15 << 10),
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CCValuesShift = 10,
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CompareZeroCCMaskMask = (15 << 14),
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CompareZeroCCMaskShift = 14,
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CCMaskFirst = (1 << 18),
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CCMaskLast = (1 << 19),
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IsLogical = (1 << 20),
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CCIfNoSignedWrap = (1 << 21)
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};
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static inline unsigned getAccessSize(unsigned int Flags) {
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return (Flags & AccessSizeMask) >> AccessSizeShift;
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}
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static inline unsigned getCCValues(unsigned int Flags) {
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return (Flags & CCValuesMask) >> CCValuesShift;
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}
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static inline unsigned getCompareZeroCCMask(unsigned int Flags) {
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return (Flags & CompareZeroCCMaskMask) >> CompareZeroCCMaskShift;
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}
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// SystemZ MachineOperand target flags.
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enum {
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// Masks out the bits for the access model.
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MO_SYMBOL_MODIFIER = (3 << 0),
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// @GOT (aka @GOTENT)
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MO_GOT = (1 << 0),
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// @INDNTPOFF
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MO_INDNTPOFF = (2 << 0)
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};
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// Classifies a branch.
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enum BranchType {
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// An instruction that branches on the current value of CC.
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BranchNormal,
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// An instruction that peforms a 32-bit signed comparison and branches
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// on the result.
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BranchC,
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// An instruction that peforms a 32-bit unsigned comparison and branches
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// on the result.
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BranchCL,
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// An instruction that peforms a 64-bit signed comparison and branches
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// on the result.
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BranchCG,
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// An instruction that peforms a 64-bit unsigned comparison and branches
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// on the result.
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BranchCLG,
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// An instruction that decrements a 32-bit register and branches if
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// the result is nonzero.
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BranchCT,
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// An instruction that decrements a 64-bit register and branches if
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// the result is nonzero.
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BranchCTG,
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// An instruction representing an asm goto statement.
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AsmGoto
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};
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// Information about a branch instruction.
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class Branch {
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// The target of the branch. In case of INLINEASM_BR, this is nullptr.
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const MachineOperand *Target;
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public:
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// The type of the branch.
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BranchType Type;
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// CCMASK_<N> is set if CC might be equal to N.
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unsigned CCValid;
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// CCMASK_<N> is set if the branch should be taken when CC == N.
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unsigned CCMask;
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Branch(BranchType type, unsigned ccValid, unsigned ccMask,
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const MachineOperand *target)
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: Target(target), Type(type), CCValid(ccValid), CCMask(ccMask) {}
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bool isIndirect() { return Target != nullptr && Target->isReg(); }
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bool hasMBBTarget() { return Target != nullptr && Target->isMBB(); }
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MachineBasicBlock *getMBBTarget() {
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return hasMBBTarget() ? Target->getMBB() : nullptr;
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}
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};
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// Kinds of fused compares in compare-and-* instructions. Together with type
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// of the converted compare, this identifies the compare-and-*
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// instruction.
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enum FusedCompareType {
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// Relative branch - CRJ etc.
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CompareAndBranch,
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// Indirect branch, used for return - CRBReturn etc.
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CompareAndReturn,
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// Indirect branch, used for sibcall - CRBCall etc.
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CompareAndSibcall,
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// Trap
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CompareAndTrap
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};
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} // end namespace SystemZII
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namespace SystemZ {
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int getTwoOperandOpcode(uint16_t Opcode);
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int getTargetMemOpcode(uint16_t Opcode);
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// Return a version of comparison CC mask CCMask in which the LT and GT
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// actions are swapped.
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unsigned reverseCCMask(unsigned CCMask);
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// Create a new basic block after MBB.
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MachineBasicBlock *emitBlockAfter(MachineBasicBlock *MBB);
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// Split MBB after MI and return the new block (the one that contains
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// instructions after MI).
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MachineBasicBlock *splitBlockAfter(MachineBasicBlock::iterator MI,
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MachineBasicBlock *MBB);
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// Split MBB before MI and return the new block (the one that contains MI).
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MachineBasicBlock *splitBlockBefore(MachineBasicBlock::iterator MI,
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MachineBasicBlock *MBB);
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}
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class SystemZInstrInfo : public SystemZGenInstrInfo {
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const SystemZRegisterInfo RI;
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SystemZSubtarget &STI;
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void splitMove(MachineBasicBlock::iterator MI, unsigned NewOpcode) const;
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void splitAdjDynAlloc(MachineBasicBlock::iterator MI) const;
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void expandRIPseudo(MachineInstr &MI, unsigned LowOpcode, unsigned HighOpcode,
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bool ConvertHigh) const;
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void expandRIEPseudo(MachineInstr &MI, unsigned LowOpcode,
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unsigned LowOpcodeK, unsigned HighOpcode) const;
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void expandRXYPseudo(MachineInstr &MI, unsigned LowOpcode,
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unsigned HighOpcode) const;
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void expandLOCPseudo(MachineInstr &MI, unsigned LowOpcode,
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unsigned HighOpcode) const;
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void expandZExtPseudo(MachineInstr &MI, unsigned LowOpcode,
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unsigned Size) const;
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void expandLoadStackGuard(MachineInstr *MI) const;
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MachineInstrBuilder
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emitGRX32Move(MachineBasicBlock &MBB, MachineBasicBlock::iterator MBBI,
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const DebugLoc &DL, unsigned DestReg, unsigned SrcReg,
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unsigned LowLowOpcode, unsigned Size, bool KillSrc,
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bool UndefSrc) const;
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virtual void anchor();
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protected:
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/// Commutes the operands in the given instruction by changing the operands
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/// order and/or changing the instruction's opcode and/or the immediate value
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/// operand.
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///
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/// The arguments 'CommuteOpIdx1' and 'CommuteOpIdx2' specify the operands
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/// to be commuted.
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///
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/// Do not call this method for a non-commutable instruction or
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/// non-commutable operands.
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/// Even though the instruction is commutable, the method may still
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/// fail to commute the operands, null pointer is returned in such cases.
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MachineInstr *commuteInstructionImpl(MachineInstr &MI, bool NewMI,
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unsigned CommuteOpIdx1,
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unsigned CommuteOpIdx2) const override;
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public:
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explicit SystemZInstrInfo(SystemZSubtarget &STI);
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// Override TargetInstrInfo.
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unsigned isLoadFromStackSlot(const MachineInstr &MI,
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int &FrameIndex) const override;
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unsigned isStoreToStackSlot(const MachineInstr &MI,
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int &FrameIndex) const override;
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bool isStackSlotCopy(const MachineInstr &MI, int &DestFrameIndex,
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int &SrcFrameIndex) const override;
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bool analyzeBranch(MachineBasicBlock &MBB, MachineBasicBlock *&TBB,
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MachineBasicBlock *&FBB,
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SmallVectorImpl<MachineOperand> &Cond,
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bool AllowModify) const override;
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unsigned removeBranch(MachineBasicBlock &MBB,
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int *BytesRemoved = nullptr) const override;
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unsigned insertBranch(MachineBasicBlock &MBB, MachineBasicBlock *TBB,
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MachineBasicBlock *FBB, ArrayRef<MachineOperand> Cond,
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const DebugLoc &DL,
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int *BytesAdded = nullptr) const override;
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bool analyzeCompare(const MachineInstr &MI, Register &SrcReg,
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Register &SrcReg2, int &Mask, int &Value) const override;
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bool canInsertSelect(const MachineBasicBlock &, ArrayRef<MachineOperand> Cond,
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Register, Register, Register, int &, int &,
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int &) const override;
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void insertSelect(MachineBasicBlock &MBB, MachineBasicBlock::iterator MI,
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const DebugLoc &DL, Register DstReg,
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ArrayRef<MachineOperand> Cond, Register TrueReg,
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Register FalseReg) const override;
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bool FoldImmediate(MachineInstr &UseMI, MachineInstr &DefMI, Register Reg,
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MachineRegisterInfo *MRI) const override;
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bool isPredicable(const MachineInstr &MI) const override;
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bool isProfitableToIfCvt(MachineBasicBlock &MBB, unsigned NumCycles,
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unsigned ExtraPredCycles,
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BranchProbability Probability) const override;
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bool isProfitableToIfCvt(MachineBasicBlock &TMBB,
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unsigned NumCyclesT, unsigned ExtraPredCyclesT,
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MachineBasicBlock &FMBB,
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unsigned NumCyclesF, unsigned ExtraPredCyclesF,
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BranchProbability Probability) const override;
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bool isProfitableToDupForIfCvt(MachineBasicBlock &MBB, unsigned NumCycles,
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BranchProbability Probability) const override;
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bool PredicateInstruction(MachineInstr &MI,
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ArrayRef<MachineOperand> Pred) const override;
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void copyPhysReg(MachineBasicBlock &MBB, MachineBasicBlock::iterator MBBI,
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const DebugLoc &DL, MCRegister DestReg, MCRegister SrcReg,
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bool KillSrc) const override;
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void storeRegToStackSlot(MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MBBI,
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Register SrcReg, bool isKill, int FrameIndex,
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const TargetRegisterClass *RC,
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const TargetRegisterInfo *TRI) const override;
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void loadRegFromStackSlot(MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MBBI,
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Register DestReg, int FrameIdx,
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const TargetRegisterClass *RC,
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const TargetRegisterInfo *TRI) const override;
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MachineInstr *convertToThreeAddress(MachineFunction::iterator &MFI,
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MachineInstr &MI,
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LiveVariables *LV) const override;
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MachineInstr *
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foldMemoryOperandImpl(MachineFunction &MF, MachineInstr &MI,
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ArrayRef<unsigned> Ops,
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MachineBasicBlock::iterator InsertPt, int FrameIndex,
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LiveIntervals *LIS = nullptr,
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VirtRegMap *VRM = nullptr) const override;
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MachineInstr *foldMemoryOperandImpl(
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MachineFunction &MF, MachineInstr &MI, ArrayRef<unsigned> Ops,
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MachineBasicBlock::iterator InsertPt, MachineInstr &LoadMI,
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LiveIntervals *LIS = nullptr) const override;
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bool expandPostRAPseudo(MachineInstr &MBBI) const override;
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bool reverseBranchCondition(SmallVectorImpl<MachineOperand> &Cond) const
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override;
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// Return the SystemZRegisterInfo, which this class owns.
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const SystemZRegisterInfo &getRegisterInfo() const { return RI; }
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// Return the size in bytes of MI.
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unsigned getInstSizeInBytes(const MachineInstr &MI) const override;
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// Return true if MI is a conditional or unconditional branch.
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// When returning true, set Cond to the mask of condition-code
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// values on which the instruction will branch, and set Target
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// to the operand that contains the branch target. This target
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// can be a register or a basic block.
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SystemZII::Branch getBranchInfo(const MachineInstr &MI) const;
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// Get the load and store opcodes for a given register class.
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void getLoadStoreOpcodes(const TargetRegisterClass *RC,
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unsigned &LoadOpcode, unsigned &StoreOpcode) const;
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// Opcode is the opcode of an instruction that has an address operand,
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// and the caller wants to perform that instruction's operation on an
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// address that has displacement Offset. Return the opcode of a suitable
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// instruction (which might be Opcode itself) or 0 if no such instruction
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// exists.
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unsigned getOpcodeForOffset(unsigned Opcode, int64_t Offset) const;
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// If Opcode is a load instruction that has a LOAD AND TEST form,
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// return the opcode for the testing form, otherwise return 0.
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unsigned getLoadAndTest(unsigned Opcode) const;
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// Return true if ROTATE AND ... SELECTED BITS can be used to select bits
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// Mask of the R2 operand, given that only the low BitSize bits of Mask are
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// significant. Set Start and End to the I3 and I4 operands if so.
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bool isRxSBGMask(uint64_t Mask, unsigned BitSize,
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unsigned &Start, unsigned &End) const;
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// If Opcode is a COMPARE opcode for which an associated fused COMPARE AND *
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// operation exists, return the opcode for the latter, otherwise return 0.
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// MI, if nonnull, is the compare instruction.
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unsigned getFusedCompare(unsigned Opcode,
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SystemZII::FusedCompareType Type,
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const MachineInstr *MI = nullptr) const;
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// Try to find all CC users of the compare instruction (MBBI) and update
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// all of them to maintain equivalent behavior after swapping the compare
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// operands. Return false if not all users can be conclusively found and
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// handled. The compare instruction is *not* changed.
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bool prepareCompareSwapOperands(MachineBasicBlock::iterator MBBI) const;
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// If Opcode is a LOAD opcode for with an associated LOAD AND TRAP
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// operation exists, returh the opcode for the latter, otherwise return 0.
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unsigned getLoadAndTrap(unsigned Opcode) const;
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// Emit code before MBBI in MI to move immediate value Value into
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// physical register Reg.
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void loadImmediate(MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MBBI,
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unsigned Reg, uint64_t Value) const;
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// Perform target specific instruction verification.
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bool verifyInstruction(const MachineInstr &MI,
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StringRef &ErrInfo) const override;
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// Sometimes, it is possible for the target to tell, even without
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// aliasing information, that two MIs access different memory
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// addresses. This function returns true if two MIs access different
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// memory addresses and false otherwise.
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bool
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areMemAccessesTriviallyDisjoint(const MachineInstr &MIa,
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const MachineInstr &MIb) const override;
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};
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} // end namespace llvm
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#endif // LLVM_LIB_TARGET_SYSTEMZ_SYSTEMZINSTRINFO_H
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