#ifndef LLVM_TARGET_TARGETINSTRINFO_H
#define LLVM_TARGET_TARGETINSTRINFO_H
-#include "Support/DataTypes.h"
+#include "llvm/CodeGen/MachineBasicBlock.h"
+#include "llvm/Support/DataTypes.h"
#include <vector>
#include <cassert>
const unsigned M_BRANCH_FLAG = 1 << 1;
const unsigned M_CALL_FLAG = 1 << 2;
const unsigned M_RET_FLAG = 1 << 3;
+const unsigned M_BARRIER_FLAG = 1 << 4;
+const unsigned M_DELAY_SLOT_FLAG = 1 << 5;
const unsigned M_CC_FLAG = 1 << 6;
-const unsigned M_LOAD_FLAG = 1 << 10;
-const unsigned M_STORE_FLAG = 1 << 12;
-const unsigned M_DUMMY_PHI_FLAG = 1 << 13;
-const unsigned M_PSEUDO_FLAG = 1 << 14; // Pseudo instruction
-// 3-addr instructions which really work like 2-addr ones, eg. X86 add/sub
-const unsigned M_2_ADDR_FLAG = 1 << 15;
+const unsigned M_LOAD_FLAG = 1 << 7;
+const unsigned M_STORE_FLAG = 1 << 8;
+
+// M_2_ADDR_FLAG - 3-addr instructions which really work like 2-addr ones.
+const unsigned M_2_ADDR_FLAG = 1 << 9;
+
+// M_CONVERTIBLE_TO_3_ADDR - This is a M_2_ADDR_FLAG instruction which can be
+// changed into a 3-address instruction if the first two operands cannot be
+// assigned to the same register. The target must implement the
+// TargetInstrInfo::convertToThreeAddress method for this instruction.
+const unsigned M_CONVERTIBLE_TO_3_ADDR = 1 << 10;
+
+// This M_COMMUTABLE - is a 2- or 3-address instruction (of the form X = op Y,
+// Z), which produces the same result if Y and Z are exchanged.
+const unsigned M_COMMUTABLE = 1 << 11;
// M_TERMINATOR_FLAG - Is this instruction part of the terminator for a basic
// block? Typically this is things like return and branch instructions.
// Various passes use this to insert code into the bottom of a basic block, but
// before control flow occurs.
-const unsigned M_TERMINATOR_FLAG = 1 << 16;
+const unsigned M_TERMINATOR_FLAG = 1 << 12;
-struct TargetInstrDescriptor {
+class TargetInstrDescriptor {
+public:
const char * Name; // Assembly language mnemonic for the opcode.
int numOperands; // Number of args; -1 if variable #args
int resultPos; // Position of the result; -1 if no result
/// get - Return the machine instruction descriptor that corresponds to the
/// specified instruction opcode.
///
- const TargetInstrDescriptor& get(MachineOpCode opCode) const {
- assert((unsigned)opCode < NumOpcodes);
- return desc[opCode];
+ const TargetInstrDescriptor& get(MachineOpCode Opcode) const {
+ assert((unsigned)Opcode < NumOpcodes);
+ return desc[Opcode];
}
- const char *getName(MachineOpCode opCode) const {
- return get(opCode).Name;
+ const char *getName(MachineOpCode Opcode) const {
+ return get(Opcode).Name;
}
- int getNumOperands(MachineOpCode opCode) const {
- return get(opCode).numOperands;
+ int getNumOperands(MachineOpCode Opcode) const {
+ return get(Opcode).numOperands;
}
- InstrSchedClass getSchedClass(MachineOpCode opCode) const {
- return get(opCode).schedClass;
+ InstrSchedClass getSchedClass(MachineOpCode Opcode) const {
+ return get(Opcode).schedClass;
}
- const unsigned *getImplicitUses(MachineOpCode opCode) const {
- return get(opCode).ImplicitUses;
+ const unsigned *getImplicitUses(MachineOpCode Opcode) const {
+ return get(Opcode).ImplicitUses;
}
- const unsigned *getImplicitDefs(MachineOpCode opCode) const {
- return get(opCode).ImplicitDefs;
+ const unsigned *getImplicitDefs(MachineOpCode Opcode) const {
+ return get(Opcode).ImplicitDefs;
}
// Query instruction class flags according to the machine-independent
// flags listed above.
//
- bool isReturn(MachineOpCode opCode) const {
- return get(opCode).Flags & M_RET_FLAG;
+ bool isReturn(MachineOpCode Opcode) const {
+ return get(Opcode).Flags & M_RET_FLAG;
}
- bool isPseudoInstr(MachineOpCode opCode) const {
- return get(opCode).Flags & M_PSEUDO_FLAG;
- }
- bool isTwoAddrInstr(MachineOpCode opCode) const {
- return get(opCode).Flags & M_2_ADDR_FLAG;
+ bool isTwoAddrInstr(MachineOpCode Opcode) const {
+ return get(Opcode).Flags & M_2_ADDR_FLAG;
}
bool isTerminatorInstr(unsigned Opcode) const {
return get(Opcode).Flags & M_TERMINATOR_FLAG;
}
- //
- // Return true if the instruction is a register to register move and
- // leave the source and dest operands in the passed parameters.
- //
+ /// Return true if the instruction is a register to register move
+ /// and leave the source and dest operands in the passed parameters.
virtual bool isMoveInstr(const MachineInstr& MI,
unsigned& sourceReg,
unsigned& destReg) const {
return false;
}
+ /// convertToThreeAddress - This method must be implemented by targets that
+ /// set the M_CONVERTIBLE_TO_3_ADDR flag. When this flag is set, the target
+ /// may be able to convert a two-address instruction into a true
+ /// three-address instruction on demand. This allows the X86 target (for
+ /// example) to convert ADD and SHL instructions into LEA instructions if they
+ /// would require register copies due to two-addressness.
+ ///
+ /// This method returns a null pointer if the transformation cannot be
+ /// performed, otherwise it returns the new instruction.
+ ///
+ virtual MachineInstr *convertToThreeAddress(MachineInstr *TA) const {
+ return 0;
+ }
+ /// commuteInstruction - If a target has any instructions that are commutable,
+ /// but require converting to a different instruction or making non-trivial
+ /// changes to commute them, this method can overloaded to do this. The
+ /// default implementation of this method simply swaps the first two operands
+ /// of MI and returns it.
+ ///
+ /// If a target wants to make more aggressive changes, they can construct and
+ /// return a new machine instruction. If an instruction cannot commute, it
+ /// can also return null.
+ ///
+ virtual MachineInstr *commuteInstruction(MachineInstr *MI) const;
+ /// Insert a goto (unconditional branch) sequence to TMBB, at the
+ /// end of MBB
+ virtual void insertGoto(MachineBasicBlock& MBB,
+ MachineBasicBlock& TMBB) const {
+ assert(0 && "Target didn't implement insertGoto!");
+ }
+
+ /// Reverses the branch condition of the MachineInstr pointed by
+ /// MI. The instruction is replaced and the new MI is returned.
+ virtual MachineBasicBlock::iterator
+ reverseBranchCondition(MachineBasicBlock::iterator MI) const {
+ assert(0 && "Target didn't implement reverseBranchCondition!");
+ abort();
+ return MI;
+ }
//-------------------------------------------------------------------------
// Code generation support for creating individual machine instructions
//
//-------------------------------------------------------------------------
- int getResultPos(MachineOpCode opCode) const {
- return get(opCode).resultPos;
+ unsigned getNumDelaySlots(MachineOpCode Opcode) const {
+ return get(Opcode).numDelaySlots;
}
- unsigned getNumDelaySlots(MachineOpCode opCode) const {
- return get(opCode).numDelaySlots;
+ bool isCCInstr(MachineOpCode Opcode) const {
+ return get(Opcode).Flags & M_CC_FLAG;
}
- bool isCCInstr(MachineOpCode opCode) const {
- return get(opCode).Flags & M_CC_FLAG;
+ bool isNop(MachineOpCode Opcode) const {
+ return get(Opcode).Flags & M_NOP_FLAG;
}
- bool isNop(MachineOpCode opCode) const {
- return get(opCode).Flags & M_NOP_FLAG;
+ bool isBranch(MachineOpCode Opcode) const {
+ return get(Opcode).Flags & M_BRANCH_FLAG;
}
- bool isBranch(MachineOpCode opCode) const {
- return get(opCode).Flags & M_BRANCH_FLAG;
+ /// 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(MachineOpCode Opcode) const {
+ return get(Opcode).Flags & M_BARRIER_FLAG;
}
- bool isCall(MachineOpCode opCode) const {
- return get(opCode).Flags & M_CALL_FLAG;
+
+ bool isCall(MachineOpCode Opcode) const {
+ return get(Opcode).Flags & M_CALL_FLAG;
}
- bool isLoad(MachineOpCode opCode) const {
- return get(opCode).Flags & M_LOAD_FLAG;
+ bool isLoad(MachineOpCode Opcode) const {
+ return get(Opcode).Flags & M_LOAD_FLAG;
}
- bool isStore(MachineOpCode opCode) const {
- return get(opCode).Flags & M_STORE_FLAG;
+ bool isStore(MachineOpCode Opcode) const {
+ return get(Opcode).Flags & M_STORE_FLAG;
}
- bool isDummyPhiInstr(MachineOpCode opCode) const {
- return get(opCode).Flags & M_DUMMY_PHI_FLAG;
+
+ /// hasDelaySlot - Returns true if the specified instruction has a delay slot
+ /// which must be filled by the code generator.
+ bool hasDelaySlot(unsigned Opcode) const {
+ return get(Opcode).Flags & M_DELAY_SLOT_FLAG;
}
- // Check if an instruction can be issued before its operands are ready,
- // or if a subsequent instruction that uses its result can be issued
- // before the results are ready.
- // Default to true since most instructions on many architectures allow this.
- //
- virtual bool hasOperandInterlock(MachineOpCode opCode) const {
- return true;
- }
- virtual bool hasResultInterlock(MachineOpCode opCode) const {
+
+ virtual bool hasResultInterlock(MachineOpCode Opcode) const {
return true;
}
-
+
//
// Latencies for individual instructions and instruction pairs
//
- virtual int minLatency(MachineOpCode opCode) const {
- return get(opCode).latency;
+ virtual int minLatency(MachineOpCode Opcode) const {
+ return get(Opcode).latency;
}
- virtual int maxLatency(MachineOpCode opCode) const {
- return get(opCode).latency;
+ virtual int maxLatency(MachineOpCode Opcode) const {
+ return get(Opcode).latency;
}
//
// Which operand holds an immediate constant? Returns -1 if none
//
- virtual int getImmedConstantPos(MachineOpCode opCode) const {
+ virtual int getImmedConstantPos(MachineOpCode Opcode) const {
return -1; // immediate position is machine specific, so say -1 == "none"
}
// Check if the specified constant fits in the immediate field
// of this machine instruction
//
- virtual bool constantFitsInImmedField(MachineOpCode opCode,
+ virtual bool constantFitsInImmedField(MachineOpCode Opcode,
int64_t intValue) const;
// Return the largest positive constant that can be held in the IMMED field
// (this is true for all immediate fields in SPARC instructions).
// Return 0 if the instruction has no IMMED field.
//
- virtual uint64_t maxImmedConstant(MachineOpCode opCode,
+ virtual uint64_t maxImmedConstant(MachineOpCode Opcode,
bool &isSignExtended) const {
- isSignExtended = get(opCode).immedIsSignExtended;
- return get(opCode).maxImmedConst;
+ isSignExtended = get(Opcode).immedIsSignExtended;
+ return get(Opcode).maxImmedConst;
}
-
- //-------------------------------------------------------------------------
- // Queries about representation of LLVM quantities (e.g., constants)
- //-------------------------------------------------------------------------
-
- /// ConstantTypeMustBeLoaded - Test if this type of constant must be loaded
- /// from memory into a register, i.e., cannot be set bitwise in register and
- /// cannot use immediate fields of instructions. Note that this only makes
- /// sense for primitive types.
- ///
- virtual bool ConstantTypeMustBeLoaded(const Constant* CV) const;
};
} // End llvm namespace
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