119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman//===-- llvm/Mc/McInstrDesc.h - Instruction Descriptors -*- C++ -*-===// 219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman// 319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman// The LLVM Compiler Infrastructure 419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman// 519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman// This file is distributed under the University of Illinois Open Source 619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman// License. See LICENSE.TXT for details. 719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman// 819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman//===----------------------------------------------------------------------===// 919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman// 1019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman// This file defines the MCOperandInfo and MCInstrDesc classes, which 1119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman// are used to describe target instructions and their operands. 1219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman// 1319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman//===----------------------------------------------------------------------===// 1419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 1519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman#ifndef LLVM_MC_MCINSTRDESC_H 1619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman#define LLVM_MC_MCINSTRDESC_H 1719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 1819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman#include "llvm/Support/DataTypes.h" 1919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 2019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Baumannamespace llvm { 2119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 2219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman//===----------------------------------------------------------------------===// 2319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman// Machine Operand Flags and Description 2419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman//===----------------------------------------------------------------------===// 2519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 2619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Baumannamespace MCOI { 2719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman // Operand constraints 2819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman enum OperandConstraint { 2919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman TIED_TO = 0, // Must be allocated the same register as. 3019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman EARLY_CLOBBER // Operand is an early clobber register operand 3119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman }; 3219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 3319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// OperandFlags - These are flags set on operands, but should be considered 3419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// private, all access should go through the MCOperandInfo accessors. 3519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// See the accessors for a description of what these are. 3619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman enum OperandFlags { 3719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman LookupPtrRegClass = 0, 3819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman Predicate, 3919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman OptionalDef 4019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman }; 4119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 4219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// Operand Type - Operands are tagged with one of the values of this enum. 4319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman enum OperandType { 4419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman OPERAND_UNKNOWN, 4519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman OPERAND_IMMEDIATE, 4619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman OPERAND_REGISTER, 4719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman OPERAND_MEMORY, 4819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman OPERAND_PCREL 4919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman }; 5019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman} 5119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 5219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman/// MCOperandInfo - This holds information about one operand of a machine 5319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman/// instruction, indicating the register class for register operands, etc. 5419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman/// 5519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Baumanclass MCOperandInfo { 5619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Baumanpublic: 5719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// RegClass - This specifies the register class enumeration of the operand 5819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// if the operand is a register. If isLookupPtrRegClass is set, then this is 5919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// an index that is passed to TargetRegisterInfo::getPointerRegClass(x) to 6019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// get a dynamic register class. 6119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman short RegClass; 6219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 6319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// Flags - These are flags from the MCOI::OperandFlags enum. 6419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman unsigned short Flags; 6519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 6619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// Lower 16 bits are used to specify which constraints are set. The higher 16 6719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// bits are used to specify the value of constraints (4 bits each). 6819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman unsigned Constraints; 6919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 7019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// OperandType - Information about the type of the operand. 7119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman MCOI::OperandType OperandType; 7219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// Currently no other information. 7319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 7419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// isLookupPtrRegClass - Set if this operand is a pointer value and it 7519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// requires a callback to look up its register class. 7619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman bool isLookupPtrRegClass() const {return Flags&(1 <<MCOI::LookupPtrRegClass);} 7719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 7819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// isPredicate - Set if this is one of the operands that made up of 7919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// the predicate operand that controls an isPredicable() instruction. 8019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman bool isPredicate() const { return Flags & (1 << MCOI::Predicate); } 8119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 8219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// isOptionalDef - Set if this operand is a optional def. 8319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// 8419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman bool isOptionalDef() const { return Flags & (1 << MCOI::OptionalDef); } 8519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman}; 8619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 8719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 8819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman//===----------------------------------------------------------------------===// 8919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman// Machine Instruction Flags and Description 9019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman//===----------------------------------------------------------------------===// 9119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 9219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman/// MCInstrDesc flags - These should be considered private to the 9319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman/// implementation of the MCInstrDesc class. Clients should use the predicate 9419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman/// methods on MCInstrDesc, not use these directly. These all correspond to 9519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman/// bitfields in the MCInstrDesc::Flags field. 9619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Baumannamespace MCID { 9719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman enum { 9819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman Variadic = 0, 9919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman HasOptionalDef, 10019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman Pseudo, 10119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman Return, 10219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman Call, 10319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman Barrier, 10419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman Terminator, 10519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman Branch, 10619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman IndirectBranch, 10719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman Compare, 10819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman MoveImm, 10919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman Bitcast, 11019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman DelaySlot, 11119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman FoldableAsLoad, 11219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman MayLoad, 11319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman MayStore, 11419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman Predicable, 11519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman NotDuplicable, 11619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman UnmodeledSideEffects, 11719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman Commutable, 11819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman ConvertibleTo3Addr, 11919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman UsesCustomInserter, 12019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman HasPostISelHook, 12119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman Rematerializable, 12219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman CheapAsAMove, 12319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman ExtraSrcRegAllocReq, 12419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman ExtraDefRegAllocReq 12519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman }; 12619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman} 12719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 12819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman/// MCInstrDesc - Describe properties that are true of each instruction in the 12919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman/// target description file. This captures information about side effects, 13019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman/// register use and many other things. There is one instance of this struct 13119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman/// for each target instruction class, and the MachineInstr class points to 13219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman/// this struct directly to describe itself. 13319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Baumanclass MCInstrDesc { 13419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Baumanpublic: 13519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman unsigned short Opcode; // The opcode number 13619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman unsigned short NumOperands; // Num of args (may be more if variable_ops) 13719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman unsigned short NumDefs; // Num of args that are definitions 13819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman unsigned short SchedClass; // enum identifying instr sched class 13919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman unsigned short Size; // Number of bytes in encoding. 14019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman const char * Name; // Name of the instruction record in td file 14119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman unsigned Flags; // Flags identifying machine instr class 14219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman uint64_t TSFlags; // Target Specific Flag values 14319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman const unsigned *ImplicitUses; // Registers implicitly read by this instr 14419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman const unsigned *ImplicitDefs; // Registers implicitly defined by this instr 14519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman const MCOperandInfo *OpInfo; // 'NumOperands' entries about operands 14619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 14719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// getOperandConstraint - Returns the value of the specific constraint if 14819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// it is set. Returns -1 if it is not set. 14919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman int getOperandConstraint(unsigned OpNum, 15019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman MCOI::OperandConstraint Constraint) const { 15119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman if (OpNum < NumOperands && 15219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman (OpInfo[OpNum].Constraints & (1 << Constraint))) { 15319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman unsigned Pos = 16 + Constraint * 4; 15419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman return (int)(OpInfo[OpNum].Constraints >> Pos) & 0xf; 15519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman } 15619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman return -1; 15719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman } 15819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 15919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// getOpcode - Return the opcode number for this descriptor. 16019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman unsigned getOpcode() const { 16119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman return Opcode; 16219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman } 16319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 16419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// getName - Return the name of the record in the .td file for this 16519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// instruction, for example "ADD8ri". 16619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman const char *getName() const { 16719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman return Name; 16819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman } 16919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 17019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// getNumOperands - Return the number of declared MachineOperands for this 17119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// MachineInstruction. Note that variadic (isVariadic() returns true) 17219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// instructions may have additional operands at the end of the list, and note 17319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// that the machine instruction may include implicit register def/uses as 17419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// well. 17519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman unsigned getNumOperands() const { 17619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman return NumOperands; 17719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman } 17819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 17919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// getNumDefs - Return the number of MachineOperands that are register 18019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// definitions. Register definitions always occur at the start of the 18119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// machine operand list. This is the number of "outs" in the .td file, 18219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// and does not include implicit defs. 18319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman unsigned getNumDefs() const { 18419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman return NumDefs; 18519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman } 18619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 18719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// isVariadic - Return true if this instruction can have a variable number of 18819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// operands. In this case, the variable operands will be after the normal 18919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// operands but before the implicit definitions and uses (if any are 19019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// present). 19119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman bool isVariadic() const { 19219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman return Flags & (1 << MCID::Variadic); 19319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman } 19419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 19519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// hasOptionalDef - Set if this instruction has an optional definition, e.g. 19619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// ARM instructions which can set condition code if 's' bit is set. 19719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman bool hasOptionalDef() const { 19819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman return Flags & (1 << MCID::HasOptionalDef); 19919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman } 20019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 20119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// getImplicitUses - Return a list of registers that are potentially 20219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// read by any instance of this machine instruction. For example, on X86, 20319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// the "adc" instruction adds two register operands and adds the carry bit in 20419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// from the flags register. In this case, the instruction is marked as 20519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// implicitly reading the flags. Likewise, the variable shift instruction on 20619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// X86 is marked as implicitly reading the 'CL' register, which it always 20719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// does. 20819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// 20919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// This method returns null if the instruction has no implicit uses. 21019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman const unsigned *getImplicitUses() const { 21119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman return ImplicitUses; 21219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman } 21319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 21419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// getNumImplicitUses - Return the number of implicit uses this instruction 21519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// has. 21619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman unsigned getNumImplicitUses() const { 21719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman if (ImplicitUses == 0) return 0; 21819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman unsigned i = 0; 21919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman for (; ImplicitUses[i]; ++i) /*empty*/; 22019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman return i; 22119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman } 22219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 22319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// getImplicitDefs - Return a list of registers that are potentially 22419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// written by any instance of this machine instruction. For example, on X86, 22519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// many instructions implicitly set the flags register. In this case, they 22619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// are marked as setting the FLAGS. Likewise, many instructions always 22719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// deposit their result in a physical register. For example, the X86 divide 22819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// instruction always deposits the quotient and remainder in the EAX/EDX 22919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// registers. For that instruction, this will return a list containing the 23019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// EAX/EDX/EFLAGS registers. 23119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// 23219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// This method returns null if the instruction has no implicit defs. 23319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman const unsigned *getImplicitDefs() const { 23419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman return ImplicitDefs; 23519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman } 23619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 23719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// getNumImplicitDefs - Return the number of implicit defs this instruction 23819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// has. 23919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman unsigned getNumImplicitDefs() const { 24019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman if (ImplicitDefs == 0) return 0; 24119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman unsigned i = 0; 24219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman for (; ImplicitDefs[i]; ++i) /*empty*/; 24319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman return i; 24419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman } 24519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 24619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// hasImplicitUseOfPhysReg - Return true if this instruction implicitly 24719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// uses the specified physical register. 24819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman bool hasImplicitUseOfPhysReg(unsigned Reg) const { 24919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman if (const unsigned *ImpUses = ImplicitUses) 25019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman for (; *ImpUses; ++ImpUses) 25119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman if (*ImpUses == Reg) return true; 25219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman return false; 25319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman } 25419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 25519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// hasImplicitDefOfPhysReg - Return true if this instruction implicitly 25619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// defines the specified physical register. 25719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman bool hasImplicitDefOfPhysReg(unsigned Reg) const { 25819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman if (const unsigned *ImpDefs = ImplicitDefs) 25919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman for (; *ImpDefs; ++ImpDefs) 26019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman if (*ImpDefs == Reg) return true; 26119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman return false; 26219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman } 26319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 26419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// getSchedClass - Return the scheduling class for this instruction. The 26519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// scheduling class is an index into the InstrItineraryData table. This 26619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// returns zero if there is no known scheduling information for the 26719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// instruction. 26819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// 26919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman unsigned getSchedClass() const { 27019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman return SchedClass; 27119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman } 27219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 27319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// getSize - Return the number of bytes in the encoding of this instruction, 27419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// or zero if the encoding size cannot be known from the opcode. 27519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman unsigned getSize() const { 27619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman return Size; 27719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman } 27819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 27919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// isPseudo - Return true if this is a pseudo instruction that doesn't 28019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// correspond to a real machine instruction. 28119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// 28219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman bool isPseudo() const { 28319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman return Flags & (1 << MCID::Pseudo); 28419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman } 28519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 28619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman bool isReturn() const { 28719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman return Flags & (1 << MCID::Return); 28819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman } 28919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 29019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman bool isCall() const { 29119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman return Flags & (1 << MCID::Call); 29219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman } 29319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 29419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// isBarrier - Returns true if the specified instruction stops control flow 29519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// from executing the instruction immediately following it. Examples include 29619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// unconditional branches and return instructions. 29719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman bool isBarrier() const { 29819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman return Flags & (1 << MCID::Barrier); 29919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman } 30019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 30119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// findFirstPredOperandIdx() - Find the index of the first operand in the 30219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// operand list that is used to represent the predicate. It returns -1 if 30319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// none is found. 30419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman int findFirstPredOperandIdx() const { 30519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman if (isPredicable()) { 30619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman for (unsigned i = 0, e = getNumOperands(); i != e; ++i) 30719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman if (OpInfo[i].isPredicate()) 30819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman return i; 30919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman } 31019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman return -1; 31119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman } 31219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 31319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// isTerminator - Returns true if this instruction part of the terminator for 31419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// a basic block. Typically this is things like return and branch 31519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// instructions. 31619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// 31719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// Various passes use this to insert code into the bottom of a basic block, 31819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// but before control flow occurs. 31919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman bool isTerminator() const { 32019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman return Flags & (1 << MCID::Terminator); 32119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman } 32219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 32319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// isBranch - Returns true if this is a conditional, unconditional, or 32419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// indirect branch. Predicates below can be used to discriminate between 32519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// these cases, and the TargetInstrInfo::AnalyzeBranch method can be used to 32619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// get more information. 32719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman bool isBranch() const { 32819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman return Flags & (1 << MCID::Branch); 32919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman } 33019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 33119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// isIndirectBranch - Return true if this is an indirect branch, such as a 33219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// branch through a register. 33319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman bool isIndirectBranch() const { 33419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman return Flags & (1 << MCID::IndirectBranch); 33519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman } 33619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 33719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// isConditionalBranch - Return true if this is a branch which may fall 33819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// through to the next instruction or may transfer control flow to some other 33919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// block. The TargetInstrInfo::AnalyzeBranch method can be used to get more 34019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// information about this branch. 34119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman bool isConditionalBranch() const { 34219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman return isBranch() & !isBarrier() & !isIndirectBranch(); 34319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman } 34419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 34519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// isUnconditionalBranch - Return true if this is a branch which always 34619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// transfers control flow to some other block. The 34719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// TargetInstrInfo::AnalyzeBranch method can be used to get more information 34819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// about this branch. 34919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman bool isUnconditionalBranch() const { 35019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman return isBranch() & isBarrier() & !isIndirectBranch(); 35119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman } 35219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 35319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman // isPredicable - Return true if this instruction has a predicate operand that 35419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman // controls execution. It may be set to 'always', or may be set to other 35519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// values. There are various methods in TargetInstrInfo that can be used to 35619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// control and modify the predicate in this instruction. 35719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman bool isPredicable() const { 35819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman return Flags & (1 << MCID::Predicable); 35919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman } 36019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 36119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// isCompare - Return true if this instruction is a comparison. 36219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman bool isCompare() const { 36319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman return Flags & (1 << MCID::Compare); 36419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman } 36519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 36619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// isMoveImmediate - Return true if this instruction is a move immediate 36719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// (including conditional moves) instruction. 36819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman bool isMoveImmediate() const { 36919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman return Flags & (1 << MCID::MoveImm); 37019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman } 37119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 37219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// isBitcast - Return true if this instruction is a bitcast instruction. 37319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// 37419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman bool isBitcast() const { 37519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman return Flags & (1 << MCID::Bitcast); 37619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman } 37719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 37819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// isNotDuplicable - Return true if this instruction cannot be safely 37919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// duplicated. For example, if the instruction has a unique labels attached 38019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// to it, duplicating it would cause multiple definition errors. 38119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman bool isNotDuplicable() const { 38219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman return Flags & (1 << MCID::NotDuplicable); 38319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman } 38419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 38519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// hasDelaySlot - Returns true if the specified instruction has a delay slot 38619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// which must be filled by the code generator. 38719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman bool hasDelaySlot() const { 38819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman return Flags & (1 << MCID::DelaySlot); 38919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman } 39019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 39119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// canFoldAsLoad - Return true for instructions that can be folded as 39219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// memory operands in other instructions. The most common use for this 39319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// is instructions that are simple loads from memory that don't modify 39419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// the loaded value in any way, but it can also be used for instructions 39519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// that can be expressed as constant-pool loads, such as V_SETALLONES 39619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// on x86, to allow them to be folded when it is beneficial. 39719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// This should only be set on instructions that return a value in their 39819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// only virtual register definition. 39919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman bool canFoldAsLoad() const { 40019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman return Flags & (1 << MCID::FoldableAsLoad); 40119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman } 40219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 40319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman //===--------------------------------------------------------------------===// 40419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman // Side Effect Analysis 40519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman //===--------------------------------------------------------------------===// 40619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 40719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// mayLoad - Return true if this instruction could possibly read memory. 40819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// Instructions with this flag set are not necessarily simple load 40919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// instructions, they may load a value and modify it, for example. 41019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman bool mayLoad() const { 41119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman return Flags & (1 << MCID::MayLoad); 41219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman } 41319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 41419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 41519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// mayStore - Return true if this instruction could possibly modify memory. 41619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// Instructions with this flag set are not necessarily simple store 41719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// instructions, they may store a modified value based on their operands, or 41819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// may not actually modify anything, for example. 41919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman bool mayStore() const { 42019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman return Flags & (1 << MCID::MayStore); 42119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman } 42219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 42319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// hasUnmodeledSideEffects - Return true if this instruction has side 42419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// effects that are not modeled by other flags. This does not return true 42519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// for instructions whose effects are captured by: 42619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// 42719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// 1. Their operand list and implicit definition/use list. Register use/def 42819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// info is explicit for instructions. 42919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// 2. Memory accesses. Use mayLoad/mayStore. 43019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// 3. Calling, branching, returning: use isCall/isReturn/isBranch. 43119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// 43219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// Examples of side effects would be modifying 'invisible' machine state like 43319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// a control register, flushing a cache, modifying a register invisible to 43419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// LLVM, etc. 43519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// 43619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman bool hasUnmodeledSideEffects() const { 43719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman return Flags & (1 << MCID::UnmodeledSideEffects); 43819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman } 43919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 44019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman //===--------------------------------------------------------------------===// 44119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman // Flags that indicate whether an instruction can be modified by a method. 44219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman //===--------------------------------------------------------------------===// 44319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 44419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// isCommutable - Return true if this may be a 2- or 3-address 44519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// instruction (of the form "X = op Y, Z, ..."), which produces the same 44619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// result if Y and Z are exchanged. If this flag is set, then the 44719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// TargetInstrInfo::commuteInstruction method may be used to hack on the 44819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// instruction. 44919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// 45019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// Note that this flag may be set on instructions that are only commutable 45119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// sometimes. In these cases, the call to commuteInstruction will fail. 45219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// Also note that some instructions require non-trivial modification to 45319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// commute them. 45419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman bool isCommutable() const { 45519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman return Flags & (1 << MCID::Commutable); 45619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman } 45719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 45819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// isConvertibleTo3Addr - Return true if this is a 2-address instruction 45919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// which can be changed into a 3-address instruction if needed. Doing this 46019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// transformation can be profitable in the register allocator, because it 46119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// means that the instruction can use a 2-address form if possible, but 46219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// degrade into a less efficient form if the source and dest register cannot 46319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// be assigned to the same register. For example, this allows the x86 46419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// backend to turn a "shl reg, 3" instruction into an LEA instruction, which 46519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// is the same speed as the shift but has bigger code size. 46619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// 46719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// If this returns true, then the target must implement the 46819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// TargetInstrInfo::convertToThreeAddress method for this instruction, which 46919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// is allowed to fail if the transformation isn't valid for this specific 47019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// instruction (e.g. shl reg, 4 on x86). 47119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// 47219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman bool isConvertibleTo3Addr() const { 47319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman return Flags & (1 << MCID::ConvertibleTo3Addr); 47419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman } 47519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 47619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// usesCustomInsertionHook - Return true if this instruction requires 47719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// custom insertion support when the DAG scheduler is inserting it into a 47819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// machine basic block. If this is true for the instruction, it basically 47919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// means that it is a pseudo instruction used at SelectionDAG time that is 48019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// expanded out into magic code by the target when MachineInstrs are formed. 48119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// 48219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// If this is true, the TargetLoweringInfo::InsertAtEndOfBasicBlock method 48319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// is used to insert this into the MachineBasicBlock. 48419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman bool usesCustomInsertionHook() const { 48519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman return Flags & (1 << MCID::UsesCustomInserter); 48619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman } 48719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 48819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// hasPostISelHook - Return true if this instruction requires *adjustment* 48919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// after instruction selection by calling a target hook. For example, this 49019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// can be used to fill in ARM 's' optional operand depending on whether 49119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// the conditional flag register is used. 49219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman bool hasPostISelHook() const { 49319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman return Flags & (1 << MCID::HasPostISelHook); 49419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman } 49519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 49619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// isRematerializable - Returns true if this instruction is a candidate for 49719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// remat. This flag is deprecated, please don't use it anymore. If this 49819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// flag is set, the isReallyTriviallyReMaterializable() method is called to 49919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// verify the instruction is really rematable. 50019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman bool isRematerializable() const { 50119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman return Flags & (1 << MCID::Rematerializable); 50219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman } 50319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 50419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// isAsCheapAsAMove - Returns true if this instruction has the same cost (or 50519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// less) than a move instruction. This is useful during certain types of 50619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// optimizations (e.g., remat during two-address conversion or machine licm) 50719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// where we would like to remat or hoist the instruction, but not if it costs 50819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// more than moving the instruction into the appropriate register. Note, we 50919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// are not marking copies from and to the same register class with this flag. 51019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman bool isAsCheapAsAMove() const { 51119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman return Flags & (1 << MCID::CheapAsAMove); 51219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman } 51319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 51419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// hasExtraSrcRegAllocReq - Returns true if this instruction source operands 51519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// have special register allocation requirements that are not captured by the 51619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// operand register classes. e.g. ARM::STRD's two source registers must be an 51719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// even / odd pair, ARM::STM registers have to be in ascending order. 51819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// Post-register allocation passes should not attempt to change allocations 51919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// for sources of instructions with this flag. 52019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman bool hasExtraSrcRegAllocReq() const { 52119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman return Flags & (1 << MCID::ExtraSrcRegAllocReq); 52219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman } 52319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 52419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// hasExtraDefRegAllocReq - Returns true if this instruction def operands 52519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// have special register allocation requirements that are not captured by the 52619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// operand register classes. e.g. ARM::LDRD's two def registers must be an 52719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// even / odd pair, ARM::LDM registers have to be in ascending order. 52819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// Post-register allocation passes should not attempt to change allocations 52919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// for definitions of instructions with this flag. 53019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman bool hasExtraDefRegAllocReq() const { 53119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman return Flags & (1 << MCID::ExtraDefRegAllocReq); 53219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman } 53319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman}; 53419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 53519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman} // end namespace llvm 53619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 53719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman#endif 538