namespace llvm {
/// finalizeBundle - Finalize a machine instruction bundle which includes
-/// a sequence of instructions starting from FirstMI to LastMI (inclusive).
+/// a sequence of instructions starting from FirstMI to LastMI (exclusive).
/// This routine adds a BUNDLE instruction to represent the bundle, it adds
/// IsInternalRead markers to MachineOperands which are defined inside the
/// bundle, and it copies externally visible defs and uses to the BUNDLE
MachineBasicBlock::instr_iterator FirstMI,
MachineBasicBlock::instr_iterator LastMI);
+/// finalizeBundle - Same functionality as the previous finalizeBundle except
+/// the last instruction in the bundle is not provided as an input. This is
+/// used in cases where bundles are pre-determined by marking instructions
+/// with 'InsideBundle' marker. It returns the MBB instruction iterator that
+/// points to the end of the bundle.
+MachineBasicBlock::instr_iterator finalizeBundle(MachineBasicBlock &MBB,
+ MachineBasicBlock::instr_iterator FirstMI);
+
+/// finalizeBundles - Finalize instruction bundles in the specified
+/// MachineFunction. Return true if any bundles are finalized.
+bool finalizeBundles(MachineFunction &MF);
+
+/// getBundleStart - Returns the first instruction in the bundle containing MI.
+///
+inline MachineInstr *getBundleStart(MachineInstr *MI) {
+ MachineBasicBlock::instr_iterator I = MI;
+ while (I->isInsideBundle())
+ --I;
+ return I;
+}
+
+inline const MachineInstr *getBundleStart(const MachineInstr *MI) {
+ MachineBasicBlock::const_instr_iterator I = MI;
+ while (I->isInsideBundle())
+ --I;
+ return I;
+}
+
+//===----------------------------------------------------------------------===//
+// MachineOperand iterator
+//
+
+/// MachineOperandIteratorBase - Iterator that can visit all operands on a
+/// MachineInstr, or all operands on a bundle of MachineInstrs. This class is
+/// not intended to be used directly, use one of the sub-classes instead.
+///
+/// Intended use:
+///
+/// for (MIBundleOperands MIO(MI); MIO.isValid(); ++MIO) {
+/// if (!MIO->isReg())
+/// continue;
+/// ...
+/// }
+///
+class MachineOperandIteratorBase {
+ MachineBasicBlock::instr_iterator InstrI, InstrE;
+ MachineInstr::mop_iterator OpI, OpE;
+
+ // If the operands on InstrI are exhausted, advance InstrI to the next
+ // bundled instruction with operands.
+ void advance() {
+ while (OpI == OpE) {
+ // Don't advance off the basic block, or into a new bundle.
+ if (++InstrI == InstrE || !InstrI->isInsideBundle())
+ break;
+ OpI = InstrI->operands_begin();
+ OpE = InstrI->operands_end();
+ }
+ }
+
+protected:
+ /// MachineOperandIteratorBase - Create an iterator that visits all operands
+ /// on MI, or all operands on every instruction in the bundle containing MI.
+ ///
+ /// @param MI The instruction to examine.
+ /// @param WholeBundle When true, visit all operands on the entire bundle.
+ ///
+ explicit MachineOperandIteratorBase(MachineInstr *MI, bool WholeBundle) {
+ if (WholeBundle) {
+ InstrI = getBundleStart(MI);
+ InstrE = MI->getParent()->instr_end();
+ } else {
+ InstrI = InstrE = MI;
+ ++InstrE;
+ }
+ OpI = InstrI->operands_begin();
+ OpE = InstrI->operands_end();
+ if (WholeBundle)
+ advance();
+ }
+
+ MachineOperand &deref() const { return *OpI; }
+
+public:
+ /// isValid - Returns true until all the operands have been visited.
+ bool isValid() const { return OpI != OpE; }
+
+ /// Preincrement. Move to the next operand.
+ void operator++() {
+ assert(isValid() && "Cannot advance MIOperands beyond the last operand");
+ ++OpI;
+ advance();
+ }
+
+ /// getOperandNo - Returns the number of the current operand relative to its
+ /// instruction.
+ ///
+ unsigned getOperandNo() const {
+ return OpI - InstrI->operands_begin();
+ }
+
+ /// RegInfo - Information about a virtual register used by a set of operands.
+ ///
+ struct RegInfo {
+ /// Reads - One of the operands read the virtual register. This does not
+ /// include <undef> or <internal> use operands, see MO::readsReg().
+ bool Reads;
+
+ /// Writes - One of the operands writes the virtual register.
+ bool Writes;
+
+ /// Tied - Uses and defs must use the same register. This can be because of
+ /// a two-address constraint, or there may be a partial redefinition of a
+ /// sub-register.
+ bool Tied;
+ };
+
+ /// analyzeVirtReg - Analyze how the current instruction or bundle uses a
+ /// virtual register. This function should not be called after operator++(),
+ /// it expects a fresh iterator.
+ ///
+ /// @param Reg The virtual register to analyze.
+ /// @param Ops When set, this vector will receive an (MI, OpNum) entry for
+ /// each operand referring to Reg.
+ /// @returns A filled-in RegInfo struct.
+ RegInfo analyzeVirtReg(unsigned Reg,
+ SmallVectorImpl<std::pair<MachineInstr*, unsigned> > *Ops = 0);
+};
+
+/// MIOperands - Iterate over operands of a single instruction.
+///
+class MIOperands : public MachineOperandIteratorBase {
+public:
+ MIOperands(MachineInstr *MI) : MachineOperandIteratorBase(MI, false) {}
+ MachineOperand &operator* () const { return deref(); }
+ MachineOperand *operator->() const { return &deref(); }
+};
+
+/// ConstMIOperands - Iterate over operands of a single const instruction.
+///
+class ConstMIOperands : public MachineOperandIteratorBase {
+public:
+ ConstMIOperands(const MachineInstr *MI)
+ : MachineOperandIteratorBase(const_cast<MachineInstr*>(MI), false) {}
+ const MachineOperand &operator* () const { return deref(); }
+ const MachineOperand *operator->() const { return &deref(); }
+};
+
+/// MIBundleOperands - Iterate over all operands in a bundle of machine
+/// instructions.
+///
+class MIBundleOperands : public MachineOperandIteratorBase {
+public:
+ MIBundleOperands(MachineInstr *MI) : MachineOperandIteratorBase(MI, true) {}
+ MachineOperand &operator* () const { return deref(); }
+ MachineOperand *operator->() const { return &deref(); }
+};
+
+/// ConstMIBundleOperands - Iterate over all operands in a const bundle of
+/// machine instructions.
+///
+class ConstMIBundleOperands : public MachineOperandIteratorBase {
+public:
+ ConstMIBundleOperands(const MachineInstr *MI)
+ : MachineOperandIteratorBase(const_cast<MachineInstr*>(MI), true) {}
+ const MachineOperand &operator* () const { return deref(); }
+ const MachineOperand *operator->() const { return &deref(); }
+};
+
} // End llvm namespace
#endif
projects / oota-llvm.git / blobdiff