#ifndef LLVM_CODEGEN_MACHINEINSTR_H
#define LLVM_CODEGEN_MACHINEINSTR_H
-#include "llvm/CodeGen/MachineOperand.h"
-#include "llvm/MC/MCInstrDesc.h"
-#include "llvm/Target/TargetOpcodes.h"
-#include "llvm/ADT/ilist.h"
-#include "llvm/ADT/ilist_node.h"
+#include "llvm/ADT/ArrayRef.h"
+#include "llvm/ADT/DenseMapInfo.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/StringRef.h"
-#include "llvm/ADT/DenseMapInfo.h"
+#include "llvm/ADT/ilist.h"
+#include "llvm/ADT/ilist_node.h"
+#include "llvm/CodeGen/MachineOperand.h"
+#include "llvm/IR/InlineAsm.h"
+#include "llvm/MC/MCInstrDesc.h"
#include "llvm/Support/DebugLoc.h"
+#include "llvm/Target/TargetOpcodes.h"
#include <vector>
namespace llvm {
NoFlags = 0,
FrameSetup = 1 << 0, // Instruction is used as a part of
// function frame setup code.
- InsideBundle = 1 << 1 // Instruction is inside a bundle (not
- // the first MI in a bundle)
+ BundledPred = 1 << 1, // Instruction has bundled predecessors.
+ BundledSucc = 1 << 2 // Instruction has bundled successors.
};
private:
const MCInstrDesc *MCID; // Instruction descriptor.
// anything other than to convey comment
// information to AsmPrinter.
+ uint16_t NumMemRefs; // information on memory references
+ mmo_iterator MemRefs;
+
std::vector<MachineOperand> Operands; // the operands
- mmo_iterator MemRefs; // information on memory references
- mmo_iterator MemRefsEnd;
MachineBasicBlock *Parent; // Pointer to the owning basic block.
DebugLoc debugLoc; // Source line information.
- MachineInstr(const MachineInstr&); // DO NOT IMPLEMENT
- void operator=(const MachineInstr&); // DO NOT IMPLEMENT
+ MachineInstr(const MachineInstr&) LLVM_DELETED_FUNCTION;
+ void operator=(const MachineInstr&) LLVM_DELETED_FUNCTION;
// Intrusive list support
friend struct ilist_traits<MachineInstr>;
/// MachineInstr in the given MachineFunction.
MachineInstr(MachineFunction &, const MachineInstr &);
- /// MachineInstr ctor - This constructor creates a dummy MachineInstr with
- /// MCID NULL and no operands.
- MachineInstr();
-
- // The next two constructors have DebugLoc and non-DebugLoc versions;
- // over time, the non-DebugLoc versions should be phased out and eventually
- // removed.
-
- /// MachineInstr ctor - This constructor creates a MachineInstr and adds the
- /// implicit operands. It reserves space for the number of operands specified
- /// by the MCInstrDesc. The version with a DebugLoc should be preferred.
- explicit MachineInstr(const MCInstrDesc &MCID, bool NoImp = false);
-
- /// MachineInstr ctor - Work exactly the same as the ctor above, except that
- /// the MachineInstr is created and added to the end of the specified basic
- /// block. The version with a DebugLoc should be preferred.
- MachineInstr(MachineBasicBlock *MBB, const MCInstrDesc &MCID);
-
/// MachineInstr ctor - This constructor create a MachineInstr and add the
/// implicit operands. It reserves space for number of operands specified by
/// MCInstrDesc. An explicit DebugLoc is supplied.
- explicit MachineInstr(const MCInstrDesc &MCID, const DebugLoc dl,
- bool NoImp = false);
-
- /// MachineInstr ctor - Work exactly the same as the ctor above, except that
- /// the MachineInstr is created and added to the end of the specified basic
- /// block.
- MachineInstr(MachineBasicBlock *MBB, const DebugLoc dl,
- const MCInstrDesc &MCID);
+ MachineInstr(MachineFunction&, const MCInstrDesc &MCID,
+ const DebugLoc dl, bool NoImp = false);
~MachineInstr();
}
void setFlags(unsigned flags) {
- Flags = flags;
+ // Filter out the automatically maintained flags.
+ unsigned Mask = BundledPred | BundledSucc;
+ Flags = (Flags & Mask) | (flags & ~Mask);
}
/// clearFlag - Clear a MI flag.
/// ----------------
/// |
/// ----------------
- /// | MI * |
+ /// | MI * |
/// ----------------
/// |
/// ----------------
- /// | MI * |
+ /// | MI * |
/// ----------------
/// In this case, the first MI starts a bundle but is not inside a bundle, the
/// next 2 MIs are considered "inside" the bundle.
/// ----------------
/// |
/// ----------------
- /// | MI * |
+ /// | MI * |
/// ----------------
/// |
/// ----------------
- /// | MI * |
+ /// | MI * |
/// ----------------
/// The first instruction has the special opcode "BUNDLE". It's not "inside"
/// a bundle, but the next three MIs are.
bool isInsideBundle() const {
- return getFlag(InsideBundle);
+ return getFlag(BundledPred);
}
- /// setIsInsideBundle - Set InsideBundle bit.
- ///
- void setIsInsideBundle(bool Val = true) {
- if (Val)
- setFlag(InsideBundle);
- else
- clearFlag(InsideBundle);
+ /// isBundled - Return true if this instruction part of a bundle. This is true
+ /// if either itself or its following instruction is marked "InsideBundle".
+ bool isBundled() const {
+ return isBundledWithPred() || isBundledWithSucc();
}
+ /// Return true if this instruction is part of a bundle, and it is not the
+ /// first instruction in the bundle.
+ bool isBundledWithPred() const { return getFlag(BundledPred); }
+
+ /// Return true if this instruction is part of a bundle, and it is not the
+ /// last instruction in the bundle.
+ bool isBundledWithSucc() const { return getFlag(BundledSucc); }
+
+ /// Bundle this instruction with its predecessor. This can be an unbundled
+ /// instruction, or it can be the first instruction in a bundle.
+ void bundleWithPred();
+
+ /// Bundle this instruction with its successor. This can be an unbundled
+ /// instruction, or it can be the last instruction in a bundle.
+ void bundleWithSucc();
+
+ /// Break bundle above this instruction.
+ void unbundleFromPred();
+
+ /// Break bundle below this instruction.
+ void unbundleFromSucc();
+
/// getDebugLoc - Returns the debug location id of this MachineInstr.
///
DebugLoc getDebugLoc() const { return debugLoc; }
/// Access to memory operands of the instruction
mmo_iterator memoperands_begin() const { return MemRefs; }
- mmo_iterator memoperands_end() const { return MemRefsEnd; }
- bool memoperands_empty() const { return MemRefsEnd == MemRefs; }
+ mmo_iterator memoperands_end() const { return MemRefs + NumMemRefs; }
+ bool memoperands_empty() const { return NumMemRefs == 0; }
/// hasOneMemOperand - Return true if this instruction has exactly one
/// MachineMemOperand.
bool hasOneMemOperand() const {
- return MemRefsEnd - MemRefs == 1;
+ return NumMemRefs == 1;
}
/// API for querying MachineInstr properties. They are the same as MCInstrDesc
/// The first argument is the property being queried.
/// The second argument indicates whether the query should look inside
/// instruction bundles.
- bool hasProperty(unsigned Flag, QueryType Type = AnyInBundle) const;
+ bool hasProperty(unsigned MCFlag, QueryType Type = AnyInBundle) const {
+ // Inline the fast path.
+ if (Type == IgnoreBundle || !isBundle())
+ return getDesc().getFlags() & (1 << MCFlag);
+
+ // If we have a bundle, take the slow path.
+ return hasPropertyInBundle(1 << MCFlag, Type);
+ }
/// isVariadic - Return true if this instruction can have a variable number of
/// operands. In this case, the variable operands will be after the normal
return hasProperty(MCID::Bitcast, Type);
}
+ /// isSelect - Return true if this instruction is a select instruction.
+ ///
+ bool isSelect(QueryType Type = IgnoreBundle) const {
+ return hasProperty(MCID::Select, Type);
+ }
+
/// 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.
/// Instructions with this flag set are not necessarily simple load
/// instructions, they may load a value and modify it, for example.
bool mayLoad(QueryType Type = AnyInBundle) const {
+ if (isInlineAsm()) {
+ unsigned ExtraInfo = getOperand(InlineAsm::MIOp_ExtraInfo).getImm();
+ if (ExtraInfo & InlineAsm::Extra_MayLoad)
+ return true;
+ }
return hasProperty(MCID::MayLoad, Type);
}
/// instructions, they may store a modified value based on their operands, or
/// may not actually modify anything, for example.
bool mayStore(QueryType Type = AnyInBundle) const {
+ if (isInlineAsm()) {
+ unsigned ExtraInfo = getOperand(InlineAsm::MIOp_ExtraInfo).getImm();
+ if (ExtraInfo & InlineAsm::Extra_MayStore)
+ return true;
+ }
return hasProperty(MCID::MayStore, Type);
}
bool isIdenticalTo(const MachineInstr *Other,
MICheckType Check = CheckDefs) const;
- /// removeFromParent - This method unlinks 'this' from the containing basic
- /// block, and returns it, but does not delete it.
+ /// Unlink 'this' from the containing basic block, and return it without
+ /// deleting it.
+ ///
+ /// This function can not be used on bundled instructions, use
+ /// removeFromBundle() to remove individual instructions from a bundle.
MachineInstr *removeFromParent();
- /// eraseFromParent - This method unlinks 'this' from the containing basic
- /// block and deletes it.
+ /// Unlink this instruction from its basic block and return it without
+ /// deleting it.
+ ///
+ /// If the instruction is part of a bundle, the other instructions in the
+ /// bundle remain bundled.
+ MachineInstr *removeFromBundle();
+
+ /// Unlink 'this' from the containing basic block and delete it.
+ ///
+ /// If this instruction is the header of a bundle, the whole bundle is erased.
+ /// This function can not be used for instructions inside a bundle, use
+ /// eraseFromBundle() to erase individual bundled instructions.
void eraseFromParent();
+ /// Unlink 'this' form its basic block and delete it.
+ ///
+ /// If the instruction is part of a bundle, the other instructions in the
+ /// bundle remain bundled.
+ void eraseFromBundle();
+
/// isLabel - Returns true if the MachineInstr represents a label.
///
bool isLabel() const {
bool isImplicitDef() const { return getOpcode()==TargetOpcode::IMPLICIT_DEF; }
bool isInlineAsm() const { return getOpcode() == TargetOpcode::INLINEASM; }
bool isStackAligningInlineAsm() const;
+ InlineAsm::AsmDialect getInlineAsmDialect() const;
bool isInsertSubreg() const {
return getOpcode() == TargetOpcode::INSERT_SUBREG;
}
getOperand(0).getSubReg() == getOperand(1).getSubReg();
}
+ /// isTransient - Return true if this is a transient instruction that is
+ /// either very likely to be eliminated during register allocation (such as
+ /// copy-like instructions), or if this instruction doesn't have an
+ /// execution-time cost.
+ bool isTransient() const {
+ switch(getOpcode()) {
+ default: return false;
+ // Copy-like instructions are usually eliminated during register allocation.
+ case TargetOpcode::PHI:
+ case TargetOpcode::COPY:
+ case TargetOpcode::INSERT_SUBREG:
+ case TargetOpcode::SUBREG_TO_REG:
+ case TargetOpcode::REG_SEQUENCE:
+ // Pseudo-instructions that don't produce any real output.
+ case TargetOpcode::IMPLICIT_DEF:
+ case TargetOpcode::KILL:
+ case TargetOpcode::PROLOG_LABEL:
+ case TargetOpcode::EH_LABEL:
+ case TargetOpcode::GC_LABEL:
+ case TargetOpcode::DBG_VALUE:
+ return true;
+ }
+ }
+
/// getBundleSize - Return the number of instructions inside the MI bundle.
unsigned getBundleSize() const;
/// that are not dead are skipped. If Overlap is true, then it also looks for
/// defs that merely overlap the specified register. If TargetRegisterInfo is
/// non-null, then it also checks if there is a def of a super-register.
+ /// This may also return a register mask operand when Overlap is true.
int findRegisterDefOperandIdx(unsigned Reg,
bool isDead = false, bool Overlap = false,
const TargetRegisterInfo *TRI = NULL) const;
const TargetInstrInfo *TII,
const TargetRegisterInfo *TRI) const;
+ /// tieOperands - Add a tie between the register operands at DefIdx and
+ /// UseIdx. The tie will cause the register allocator to ensure that the two
+ /// operands are assigned the same physical register.
+ ///
+ /// Tied operands are managed automatically for explicit operands in the
+ /// MCInstrDesc. This method is for exceptional cases like inline asm.
+ void tieOperands(unsigned DefIdx, unsigned UseIdx);
+
+ /// findTiedOperandIdx - Given the index of a tied register operand, find the
+ /// operand it is tied to. Defs are tied to uses and vice versa. Returns the
+ /// index of the tied operand which must exist.
+ unsigned findTiedOperandIdx(unsigned OpIdx) const;
+
/// isRegTiedToUseOperand - Given the index of a register def operand,
/// check if the register def is tied to a source operand, due to either
/// two-address elimination or inline assembly constraints. Returns the
- /// first tied use operand index by reference is UseOpIdx is not null.
- bool isRegTiedToUseOperand(unsigned DefOpIdx, unsigned *UseOpIdx = 0) const;
+ /// first tied use operand index by reference if UseOpIdx is not null.
+ bool isRegTiedToUseOperand(unsigned DefOpIdx, unsigned *UseOpIdx = 0) const {
+ const MachineOperand &MO = getOperand(DefOpIdx);
+ if (!MO.isReg() || !MO.isDef() || !MO.isTied())
+ return false;
+ if (UseOpIdx)
+ *UseOpIdx = findTiedOperandIdx(DefOpIdx);
+ return true;
+ }
/// isRegTiedToDefOperand - Return true if the use operand of the specified
/// index is tied to an def operand. It also returns the def operand index by
/// reference if DefOpIdx is not null.
- bool isRegTiedToDefOperand(unsigned UseOpIdx, unsigned *DefOpIdx = 0) const;
+ bool isRegTiedToDefOperand(unsigned UseOpIdx, unsigned *DefOpIdx = 0) const {
+ const MachineOperand &MO = getOperand(UseOpIdx);
+ if (!MO.isReg() || !MO.isUse() || !MO.isTied())
+ return false;
+ if (DefOpIdx)
+ *DefOpIdx = findTiedOperandIdx(UseOpIdx);
+ return true;
+ }
/// clearKillInfo - Clears kill flags on all operands.
///
void clearKillInfo();
- /// copyKillDeadInfo - Copies kill / dead operand properties from MI.
- ///
- void copyKillDeadInfo(const MachineInstr *MI);
-
- /// copyPredicates - Copies predicate operand(s) from MI.
- void copyPredicates(const MachineInstr *MI);
-
/// substituteRegister - Replace all occurrences of FromReg with ToReg:SubIdx,
/// properly composing subreg indices where necessary.
void substituteRegister(unsigned FromReg, unsigned ToReg, unsigned SubIdx,
/// setPhysRegsDeadExcept - Mark every physreg used by this instruction as
/// dead except those in the UsedRegs list.
- void setPhysRegsDeadExcept(const SmallVectorImpl<unsigned> &UsedRegs,
+ ///
+ /// On instructions with register mask operands, also add implicit-def
+ /// operands for all registers in UsedRegs.
+ void setPhysRegsDeadExcept(ArrayRef<unsigned> UsedRegs,
const TargetRegisterInfo &TRI);
/// isSafeToMove - Return true if it is safe to move this instruction. If
bool isSafeToReMat(const TargetInstrInfo *TII, AliasAnalysis *AA,
unsigned DstReg) const;
- /// hasVolatileMemoryRef - Return true if this instruction may have a
- /// volatile memory reference, or if the information describing the
- /// memory reference is not available. Return false if it is known to
- /// have no volatile memory references.
- bool hasVolatileMemoryRef() const;
+ /// hasOrderedMemoryRef - Return true if this instruction may have an ordered
+ /// or volatile memory reference, or if the information describing the memory
+ /// reference is not available. Return false if it is known to have no
+ /// ordered or volatile memory references.
+ bool hasOrderedMemoryRef() const;
/// isInvariantLoad - Return true if this instruction is loading from a
/// location whose value is invariant across the function. For example,
/// copyImplicitOps - Copy implicit register operands from specified
/// instruction to this instruction.
- void copyImplicitOps(const MachineInstr *MI);
+ void copyImplicitOps(MachineFunction &MF, const MachineInstr *MI);
//
// Debugging support
//===--------------------------------------------------------------------===//
// Accessors used to build up machine instructions.
- /// addOperand - Add the specified operand to the instruction. If it is an
- /// implicit operand, it is added to the end of the operand list. If it is
- /// an explicit operand it is added at the end of the explicit operand list
+ /// Add the specified operand to the instruction. If it is an implicit
+ /// operand, it is added to the end of the operand list. If it is an
+ /// explicit operand it is added at the end of the explicit operand list
/// (before the first implicit operand).
+ ///
+ /// MF must be the machine function that was used to allocate this
+ /// instruction.
+ ///
+ /// MachineInstrBuilder provides a more convenient interface for creating
+ /// instructions and adding operands.
+ void addOperand(MachineFunction &MF, const MachineOperand &Op);
+
+ /// Add an operand without providing an MF reference. This only works for
+ /// instructions that are inserted in a basic block.
+ ///
+ /// MachineInstrBuilder and the two-argument addOperand(MF, MO) should be
+ /// preferred.
void addOperand(const MachineOperand &Op);
/// setDesc - Replace the instruction descriptor (thus opcode) of
/// list. This does not transfer ownership.
void setMemRefs(mmo_iterator NewMemRefs, mmo_iterator NewMemRefsEnd) {
MemRefs = NewMemRefs;
- MemRefsEnd = NewMemRefsEnd;
+ NumMemRefs = NewMemRefsEnd - NewMemRefs;
}
private:
/// return null.
MachineRegisterInfo *getRegInfo();
+ /// untieRegOperand - Break any tie involving OpIdx.
+ void untieRegOperand(unsigned OpIdx) {
+ MachineOperand &MO = getOperand(OpIdx);
+ if (MO.isReg() && MO.isTied()) {
+ getOperand(findTiedOperandIdx(OpIdx)).TiedTo = 0;
+ MO.TiedTo = 0;
+ }
+ }
+
/// addImplicitDefUseOperands - Add all implicit def and use operands to
/// this instruction.
- void addImplicitDefUseOperands();
+ void addImplicitDefUseOperands(MachineFunction &MF);
/// RemoveRegOperandsFromUseLists - Unlink all of the register operands in
/// this instruction from their respective use lists. This requires that the
/// operands already be on their use lists.
- void RemoveRegOperandsFromUseLists();
+ void RemoveRegOperandsFromUseLists(MachineRegisterInfo&);
/// AddRegOperandsToUseLists - Add all of the register operands in
/// this instruction from their respective use lists. This requires that the
/// operands not be on their use lists yet.
- void AddRegOperandsToUseLists(MachineRegisterInfo &RegInfo);
+ void AddRegOperandsToUseLists(MachineRegisterInfo&);
+
+ /// hasPropertyInBundle - Slow path for hasProperty when we're dealing with a
+ /// bundle.
+ bool hasPropertyInBundle(unsigned Mask, QueryType Type) const;
};
/// MachineInstrExpressionTrait - Special DenseMapInfo traits to compare
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