-//===-- llvm/Mc/McInstrDesc.h - Instruction Descriptors -*- C++ -*-===//
+//===-- llvm/MC/MCInstrDesc.h - Instruction Descriptors -*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
//===----------------------------------------------------------------------===//
//
// This file defines the MCOperandInfo and MCInstrDesc classes, which
-// are used to describe target instructions and their operands.
+// are used to describe target instructions and their operands.
//
//===----------------------------------------------------------------------===//
//===----------------------------------------------------------------------===//
// Machine Operand Flags and Description
//===----------------------------------------------------------------------===//
-
+
namespace MCOI {
// Operand constraints
enum OperandConstraint {
TIED_TO = 0, // Must be allocated the same register as.
EARLY_CLOBBER // Operand is an early clobber register operand
};
-
+
/// OperandFlags - These are flags set on operands, but should be considered
/// private, all access should go through the MCOperandInfo accessors.
/// See the accessors for a description of what these are.
Predicate,
OptionalDef
};
+
+ /// Operand Type - Operands are tagged with one of the values of this enum.
+ enum OperandType {
+ OPERAND_UNKNOWN,
+ OPERAND_IMMEDIATE,
+ OPERAND_REGISTER,
+ OPERAND_MEMORY,
+ OPERAND_PCREL
+ };
}
/// MCOperandInfo - This holds information about one operand of a machine
///
class MCOperandInfo {
public:
- /// RegClass - This specifies the register class enumeration of the operand
+ /// RegClass - This specifies the register class enumeration of the operand
/// if the operand is a register. If isLookupPtrRegClass is set, then this is
/// an index that is passed to TargetRegisterInfo::getPointerRegClass(x) to
/// get a dynamic register class.
- short RegClass;
-
+ int16_t RegClass;
+
/// Flags - These are flags from the MCOI::OperandFlags enum.
- unsigned short Flags;
-
+ uint8_t Flags;
+
+ /// OperandType - Information about the type of the operand.
+ uint8_t OperandType;
+
/// Lower 16 bits are used to specify which constraints are set. The higher 16
/// bits are used to specify the value of constraints (4 bits each).
- unsigned Constraints;
+ uint32_t Constraints;
/// Currently no other information.
-
+
/// isLookupPtrRegClass - Set if this operand is a pointer value and it
/// requires a callback to look up its register class.
- bool isLookupPtrRegClass() const { return Flags&(1 <<MCOI::LookupPtrRegClass);}
-
+ bool isLookupPtrRegClass() const {return Flags&(1 <<MCOI::LookupPtrRegClass);}
+
/// isPredicate - Set if this is one of the operands that made up of
/// the predicate operand that controls an isPredicable() instruction.
bool isPredicate() const { return Flags & (1 << MCOI::Predicate); }
-
+
/// isOptionalDef - Set if this operand is a optional def.
///
bool isOptionalDef() const { return Flags & (1 << MCOI::OptionalDef); }
};
-
+
//===----------------------------------------------------------------------===//
// Machine Instruction Flags and Description
//===----------------------------------------------------------------------===//
enum {
Variadic = 0,
HasOptionalDef,
+ Pseudo,
Return,
Call,
Barrier,
Compare,
MoveImm,
Bitcast,
+ Select,
DelaySlot,
FoldableAsLoad,
MayLoad,
Commutable,
ConvertibleTo3Addr,
UsesCustomInserter,
+ HasPostISelHook,
Rematerializable,
CheapAsAMove,
ExtraSrcRegAllocReq,
unsigned short NumDefs; // Num of args that are definitions
unsigned short SchedClass; // enum identifying instr sched class
unsigned short Size; // Number of bytes in encoding.
- const char * Name; // Name of the instruction record in td file
unsigned Flags; // Flags identifying machine instr class
uint64_t TSFlags; // Target Specific Flag values
- const unsigned *ImplicitUses; // Registers implicitly read by this instr
- const unsigned *ImplicitDefs; // Registers implicitly defined by this instr
+ const uint16_t *ImplicitUses; // Registers implicitly read by this instr
+ const uint16_t *ImplicitDefs; // Registers implicitly defined by this instr
const MCOperandInfo *OpInfo; // 'NumOperands' entries about operands
/// getOperandConstraint - Returns the value of the specific constraint if
unsigned getOpcode() const {
return Opcode;
}
-
- /// getName - Return the name of the record in the .td file for this
- /// instruction, for example "ADD8ri".
- const char *getName() const {
- return Name;
- }
-
+
/// getNumOperands - Return the number of declared MachineOperands for this
/// MachineInstruction. Note that variadic (isVariadic() returns true)
/// instructions may have additional operands at the end of the list, and note
unsigned getNumOperands() const {
return NumOperands;
}
-
+
/// getNumDefs - Return the number of MachineOperands that are register
- /// definitions. Register definitions always occur at the start of the
+ /// definitions. Register definitions always occur at the start of the
/// machine operand list. This is the number of "outs" in the .td file,
/// and does not include implicit defs.
unsigned getNumDefs() const {
return NumDefs;
}
-
+
+ /// getFlags - Return flags of this instruction.
+ ///
+ unsigned getFlags() const { return Flags; }
+
/// isVariadic - Return true if this instruction can have a variable number of
/// operands. In this case, the variable operands will be after the normal
/// operands but before the implicit definitions and uses (if any are
bool isVariadic() const {
return Flags & (1 << MCID::Variadic);
}
-
+
/// hasOptionalDef - Set if this instruction has an optional definition, e.g.
/// ARM instructions which can set condition code if 's' bit is set.
bool hasOptionalDef() const {
return Flags & (1 << MCID::HasOptionalDef);
}
-
- /// getImplicitUses - Return a list of registers that are potentially
- /// read by any instance of this machine instruction. For example, on X86,
- /// the "adc" instruction adds two register operands and adds the carry bit in
- /// from the flags register. In this case, the instruction is marked as
- /// implicitly reading the flags. Likewise, the variable shift instruction on
- /// X86 is marked as implicitly reading the 'CL' register, which it always
- /// does.
- ///
- /// This method returns null if the instruction has no implicit uses.
- const unsigned *getImplicitUses() const {
- return ImplicitUses;
- }
-
- /// getNumImplicitUses - Return the number of implicit uses this instruction
- /// has.
- unsigned getNumImplicitUses() const {
- if (ImplicitUses == 0) return 0;
- unsigned i = 0;
- for (; ImplicitUses[i]; ++i) /*empty*/;
- return i;
- }
-
- /// getImplicitDefs - Return a list of registers that are potentially
- /// written by any instance of this machine instruction. For example, on X86,
- /// many instructions implicitly set the flags register. In this case, they
- /// are marked as setting the FLAGS. Likewise, many instructions always
- /// deposit their result in a physical register. For example, the X86 divide
- /// instruction always deposits the quotient and remainder in the EAX/EDX
- /// registers. For that instruction, this will return a list containing the
- /// EAX/EDX/EFLAGS registers.
- ///
- /// This method returns null if the instruction has no implicit defs.
- const unsigned *getImplicitDefs() const {
- return ImplicitDefs;
- }
-
- /// getNumImplicitDefs - Return the number of implicit defs this instruction
- /// has.
- unsigned getNumImplicitDefs() const {
- if (ImplicitDefs == 0) return 0;
- unsigned i = 0;
- for (; ImplicitDefs[i]; ++i) /*empty*/;
- return i;
- }
-
- /// hasImplicitUseOfPhysReg - Return true if this instruction implicitly
- /// uses the specified physical register.
- bool hasImplicitUseOfPhysReg(unsigned Reg) const {
- if (const unsigned *ImpUses = ImplicitUses)
- for (; *ImpUses; ++ImpUses)
- if (*ImpUses == Reg) return true;
- return false;
- }
-
- /// hasImplicitDefOfPhysReg - Return true if this instruction implicitly
- /// defines the specified physical register.
- bool hasImplicitDefOfPhysReg(unsigned Reg) const {
- if (const unsigned *ImpDefs = ImplicitDefs)
- for (; *ImpDefs; ++ImpDefs)
- if (*ImpDefs == Reg) return true;
- return false;
- }
- /// getSchedClass - Return the scheduling class for this instruction. The
- /// scheduling class is an index into the InstrItineraryData table. This
- /// returns zero if there is no known scheduling information for the
- /// instruction.
+ /// isPseudo - Return true if this is a pseudo instruction that doesn't
+ /// correspond to a real machine instruction.
///
- unsigned getSchedClass() const {
- return SchedClass;
- }
-
- /// getSize - Return the number of bytes in the encoding of this instruction,
- /// or zero if the encoding size cannot be known from the opcode.
- unsigned getSize() const {
- return Size;
+ bool isPseudo() const {
+ return Flags & (1 << MCID::Pseudo);
}
bool isReturn() const {
return Flags & (1 << MCID::Return);
}
-
+
bool isCall() const {
return Flags & (1 << MCID::Call);
}
-
+
/// isBarrier - Returns true if the specified instruction stops control flow
/// from executing the instruction immediately following it. Examples include
/// unconditional branches and return instructions.
bool isBarrier() const {
return Flags & (1 << MCID::Barrier);
}
-
+
/// isTerminator - Returns true if this instruction part of the terminator for
/// a basic block. Typically this is things like return and branch
/// instructions.
bool isTerminator() const {
return Flags & (1 << MCID::Terminator);
}
-
+
/// isBranch - Returns true if this is a conditional, unconditional, or
/// indirect branch. Predicates below can be used to discriminate between
/// these cases, and the TargetInstrInfo::AnalyzeBranch method can be used to
bool isConditionalBranch() const {
return isBranch() & !isBarrier() & !isIndirectBranch();
}
-
+
/// isUnconditionalBranch - Return true if this is a branch which always
/// transfers control flow to some other block. The
/// TargetInstrInfo::AnalyzeBranch method can be used to get more information
bool isUnconditionalBranch() const {
return isBranch() & isBarrier() & !isIndirectBranch();
}
-
+
// isPredicable - Return true if this instruction has a predicate operand that
// controls execution. It may be set to 'always', or may be set to other
/// values. There are various methods in TargetInstrInfo that can be used to
bool isPredicable() const {
return Flags & (1 << MCID::Predicable);
}
-
+
/// isCompare - Return true if this instruction is a comparison.
bool isCompare() const {
return Flags & (1 << MCID::Compare);
}
-
+
/// isMoveImmediate - Return true if this instruction is a move immediate
- /// (including conditional moves) instruction.
+ /// (including conditional moves) instruction.
bool isMoveImmediate() const {
return Flags & (1 << MCID::MoveImm);
}
bool isBitcast() const {
return Flags & (1 << MCID::Bitcast);
}
-
+
+ /// isSelect - Return true if this is a select instruction.
+ ///
+ bool isSelect() const {
+ return Flags & (1 << MCID::Select);
+ }
+
/// isNotDuplicable - Return true if this instruction cannot be safely
/// duplicated. For example, if the instruction has a unique labels attached
/// to it, duplicating it would cause multiple definition errors.
bool isNotDuplicable() const {
return Flags & (1 << MCID::NotDuplicable);
}
-
+
/// hasDelaySlot - Returns true if the specified instruction has a delay slot
/// which must be filled by the code generator.
bool hasDelaySlot() const {
return Flags & (1 << MCID::DelaySlot);
}
-
+
/// canFoldAsLoad - Return true for instructions that can be folded as
/// memory operands in other instructions. The most common use for this
/// is instructions that are simple loads from memory that don't modify
bool canFoldAsLoad() const {
return Flags & (1 << MCID::FoldableAsLoad);
}
-
+
//===--------------------------------------------------------------------===//
// Side Effect Analysis
//===--------------------------------------------------------------------===//
bool mayLoad() const {
return Flags & (1 << MCID::MayLoad);
}
-
-
+
+
/// mayStore - Return true if this instruction could possibly modify memory.
/// Instructions with this flag set are not necessarily simple store
/// instructions, they may store a modified value based on their operands, or
bool mayStore() const {
return Flags & (1 << MCID::MayStore);
}
-
+
/// hasUnmodeledSideEffects - Return true if this instruction has side
/// effects that are not modeled by other flags. This does not return true
/// for instructions whose effects are captured by:
bool hasUnmodeledSideEffects() const {
return Flags & (1 << MCID::UnmodeledSideEffects);
}
-
+
//===--------------------------------------------------------------------===//
// Flags that indicate whether an instruction can be modified by a method.
//===--------------------------------------------------------------------===//
-
+
/// isCommutable - Return true if this may be a 2- or 3-address
/// instruction (of the form "X = op Y, Z, ..."), which produces the same
- /// result if Y and Z are exchanged. If this flag is set, then the
+ /// result if Y and Z are exchanged. If this flag is set, then the
/// TargetInstrInfo::commuteInstruction method may be used to hack on the
/// instruction.
///
bool isCommutable() const {
return Flags & (1 << MCID::Commutable);
}
-
+
/// isConvertibleTo3Addr - Return true if this is a 2-address instruction
/// which can be changed into a 3-address instruction if needed. Doing this
/// transformation can be profitable in the register allocator, because it
bool isConvertibleTo3Addr() const {
return Flags & (1 << MCID::ConvertibleTo3Addr);
}
-
+
/// usesCustomInsertionHook - Return true if this instruction requires
/// custom insertion support when the DAG scheduler is inserting it into a
/// machine basic block. If this is true for the instruction, it basically
- /// means that it is a pseudo instruction used at SelectionDAG time that is
+ /// means that it is a pseudo instruction used at SelectionDAG time that is
/// expanded out into magic code by the target when MachineInstrs are formed.
///
/// If this is true, the TargetLoweringInfo::InsertAtEndOfBasicBlock method
bool usesCustomInsertionHook() const {
return Flags & (1 << MCID::UsesCustomInserter);
}
-
+
+ /// hasPostISelHook - Return true if this instruction requires *adjustment*
+ /// after instruction selection by calling a target hook. For example, this
+ /// can be used to fill in ARM 's' optional operand depending on whether
+ /// the conditional flag register is used.
+ bool hasPostISelHook() const {
+ return Flags & (1 << MCID::HasPostISelHook);
+ }
+
/// isRematerializable - Returns true if this instruction is a candidate for
/// remat. This flag is deprecated, please don't use it anymore. If this
/// flag is set, the isReallyTriviallyReMaterializable() method is called to
bool hasExtraDefRegAllocReq() const {
return Flags & (1 << MCID::ExtraDefRegAllocReq);
}
+
+
+ /// getImplicitUses - Return a list of registers that are potentially
+ /// read by any instance of this machine instruction. For example, on X86,
+ /// the "adc" instruction adds two register operands and adds the carry bit in
+ /// from the flags register. In this case, the instruction is marked as
+ /// implicitly reading the flags. Likewise, the variable shift instruction on
+ /// X86 is marked as implicitly reading the 'CL' register, which it always
+ /// does.
+ ///
+ /// This method returns null if the instruction has no implicit uses.
+ const uint16_t *getImplicitUses() const {
+ return ImplicitUses;
+ }
+
+ /// getNumImplicitUses - Return the number of implicit uses this instruction
+ /// has.
+ unsigned getNumImplicitUses() const {
+ if (ImplicitUses == 0) return 0;
+ unsigned i = 0;
+ for (; ImplicitUses[i]; ++i) /*empty*/;
+ return i;
+ }
+
+ /// getImplicitDefs - Return a list of registers that are potentially
+ /// written by any instance of this machine instruction. For example, on X86,
+ /// many instructions implicitly set the flags register. In this case, they
+ /// are marked as setting the FLAGS. Likewise, many instructions always
+ /// deposit their result in a physical register. For example, the X86 divide
+ /// instruction always deposits the quotient and remainder in the EAX/EDX
+ /// registers. For that instruction, this will return a list containing the
+ /// EAX/EDX/EFLAGS registers.
+ ///
+ /// This method returns null if the instruction has no implicit defs.
+ const uint16_t *getImplicitDefs() const {
+ return ImplicitDefs;
+ }
+
+ /// getNumImplicitDefs - Return the number of implicit defs this instruction
+ /// has.
+ unsigned getNumImplicitDefs() const {
+ if (ImplicitDefs == 0) return 0;
+ unsigned i = 0;
+ for (; ImplicitDefs[i]; ++i) /*empty*/;
+ return i;
+ }
+
+ /// hasImplicitUseOfPhysReg - Return true if this instruction implicitly
+ /// uses the specified physical register.
+ bool hasImplicitUseOfPhysReg(unsigned Reg) const {
+ if (const uint16_t *ImpUses = ImplicitUses)
+ for (; *ImpUses; ++ImpUses)
+ if (*ImpUses == Reg) return true;
+ return false;
+ }
+
+ /// hasImplicitDefOfPhysReg - Return true if this instruction implicitly
+ /// defines the specified physical register.
+ bool hasImplicitDefOfPhysReg(unsigned Reg) const {
+ if (const uint16_t *ImpDefs = ImplicitDefs)
+ for (; *ImpDefs; ++ImpDefs)
+ if (*ImpDefs == Reg) return true;
+ return false;
+ }
+
+ /// getSchedClass - Return the scheduling class for this instruction. The
+ /// scheduling class is an index into the InstrItineraryData table. This
+ /// returns zero if there is no known scheduling information for the
+ /// instruction.
+ ///
+ unsigned getSchedClass() const {
+ return SchedClass;
+ }
+
+ /// getSize - Return the number of bytes in the encoding of this instruction,
+ /// or zero if the encoding size cannot be known from the opcode.
+ unsigned getSize() const {
+ return Size;
+ }
+
+ /// findFirstPredOperandIdx() - Find the index of the first operand in the
+ /// operand list that is used to represent the predicate. It returns -1 if
+ /// none is found.
+ int findFirstPredOperandIdx() const {
+ if (isPredicable()) {
+ for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
+ if (OpInfo[i].isPredicate())
+ return i;
+ }
+ return -1;
+ }
};
} // end namespace llvm
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