#ifndef LLVM_CODEGEN_MACHINEREGISTERINFO_H
#define LLVM_CODEGEN_MACHINEREGISTERINFO_H
-#include "llvm/Target/MRegisterInfo.h"
+#include "llvm/Target/TargetRegisterInfo.h"
#include "llvm/ADT/BitVector.h"
-#include "llvm/ADT/iterator"
+#include "llvm/ADT/iterator.h"
#include <vector>
namespace llvm {
-/// MachineRegisterInfo - Keep track of information for each virtual register,
-/// including its register class.
+/// MachineRegisterInfo - Keep track of information for virtual and physical
+/// registers, including vreg register classes, use/def chains for registers,
+/// etc.
class MachineRegisterInfo {
/// VRegInfo - Information we keep for each virtual register. The entries in
/// this vector are actually converted to vreg numbers by adding the
- /// MRegisterInfo::FirstVirtualRegister delta to their index.
+ /// TargetRegisterInfo::FirstVirtualRegister delta to their index.
///
/// Each element in this list contains the register class of the vreg and the
/// start of the use/def list for the register.
std::vector<std::pair<const TargetRegisterClass*, MachineOperand*> > VRegInfo;
+
+ /// RegClassVRegMap - This vector acts as a map from TargetRegisterClass to
+ /// virtual registers. For each target register class, it keeps a list of
+ /// virtual registers belonging to the class.
+ std::vector<std::vector<unsigned> > RegClass2VRegMap;
/// PhysRegUseDefLists - This is an array of the head of the use/def list for
/// physical registers.
MachineRegisterInfo(const MachineRegisterInfo&); // DO NOT IMPLEMENT
void operator=(const MachineRegisterInfo&); // DO NOT IMPLEMENT
public:
- MachineRegisterInfo(const MRegisterInfo &MRI);
+ explicit MachineRegisterInfo(const TargetRegisterInfo &TRI);
~MachineRegisterInfo();
//===--------------------------------------------------------------------===//
/// reg_begin/reg_end - Provide iteration support to walk over all definitions
/// and uses of a register within the MachineFunction that corresponds to this
/// MachineRegisterInfo object.
- class reg_iterator;
+ template<bool Uses, bool Defs>
+ class defusechain_iterator;
+
+ /// reg_iterator/reg_begin/reg_end - Walk all defs and uses of the specified
+ /// register.
+ typedef defusechain_iterator<true,true> reg_iterator;
reg_iterator reg_begin(unsigned RegNo) const {
return reg_iterator(getRegUseDefListHead(RegNo));
}
static reg_iterator reg_end() { return reg_iterator(0); }
+
+ /// reg_empty - Return true if there are no instructions using or defining the
+ /// specified register (it may be live-in).
+ bool reg_empty(unsigned RegNo) const { return reg_begin(RegNo) == reg_end(); }
+
+ /// def_iterator/def_begin/def_end - Walk all defs of the specified register.
+ typedef defusechain_iterator<false,true> def_iterator;
+ def_iterator def_begin(unsigned RegNo) const {
+ return def_iterator(getRegUseDefListHead(RegNo));
+ }
+ static def_iterator def_end() { return def_iterator(0); }
+
+ /// def_empty - Return true if there are no instructions defining the
+ /// specified register (it may be live-in).
+ bool def_empty(unsigned RegNo) const { return def_begin(RegNo) == def_end(); }
+
+ /// use_iterator/use_begin/use_end - Walk all uses of the specified register.
+ typedef defusechain_iterator<true,false> use_iterator;
+ use_iterator use_begin(unsigned RegNo) const {
+ return use_iterator(getRegUseDefListHead(RegNo));
+ }
+ static use_iterator use_end() { return use_iterator(0); }
+
+ /// use_empty - Return true if there are no instructions using the specified
+ /// register.
+ bool use_empty(unsigned RegNo) const { return use_begin(RegNo) == use_end(); }
+
/// replaceRegWith - Replace all instances of FromReg with ToReg in the
/// machine function. This is like llvm-level X->replaceAllUsesWith(Y),
/// getRegUseDefListHead - Return the head pointer for the register use/def
/// list for the specified virtual or physical register.
MachineOperand *&getRegUseDefListHead(unsigned RegNo) {
- if (RegNo < MRegisterInfo::FirstVirtualRegister)
+ if (RegNo < TargetRegisterInfo::FirstVirtualRegister)
return PhysRegUseDefLists[RegNo];
- RegNo -= MRegisterInfo::FirstVirtualRegister;
+ RegNo -= TargetRegisterInfo::FirstVirtualRegister;
return VRegInfo[RegNo].second;
}
MachineOperand *getRegUseDefListHead(unsigned RegNo) const {
- if (RegNo < MRegisterInfo::FirstVirtualRegister)
+ if (RegNo < TargetRegisterInfo::FirstVirtualRegister)
return PhysRegUseDefLists[RegNo];
- RegNo -= MRegisterInfo::FirstVirtualRegister;
+ RegNo -= TargetRegisterInfo::FirstVirtualRegister;
return VRegInfo[RegNo].second;
}
+
+ /// getVRegDef - Return the machine instr that defines the specified virtual
+ /// register or null if none is found. This assumes that the code is in SSA
+ /// form, so there should only be one definition.
+ MachineInstr *getVRegDef(unsigned Reg) const;
+
+#ifndef NDEBUG
+ void dumpUses(unsigned RegNo) const;
+#endif
//===--------------------------------------------------------------------===//
// Virtual Register Info
//===--------------------------------------------------------------------===//
/// getRegClass - Return the register class of the specified virtual register.
- const TargetRegisterClass *getRegClass(unsigned Reg) {
- Reg -= MRegisterInfo::FirstVirtualRegister;
+ ///
+ const TargetRegisterClass *getRegClass(unsigned Reg) const {
+ Reg -= TargetRegisterInfo::FirstVirtualRegister;
assert(Reg < VRegInfo.size() && "Invalid vreg!");
return VRegInfo[Reg].first;
}
+
+ /// setRegClass - Set the register class of the specified virtual register.
+ ///
+ void setRegClass(unsigned Reg, const TargetRegisterClass *RC) {
+ unsigned VR = Reg;
+ Reg -= TargetRegisterInfo::FirstVirtualRegister;
+ assert(Reg < VRegInfo.size() && "Invalid vreg!");
+ const TargetRegisterClass *OldRC = VRegInfo[Reg].first;
+ VRegInfo[Reg].first = RC;
+
+ // Remove from old register class's vregs list. This may be slow but
+ // fortunately this operation is rarely needed.
+ std::vector<unsigned> &VRegs = RegClass2VRegMap[OldRC->getID()];
+ std::vector<unsigned>::iterator I=std::find(VRegs.begin(), VRegs.end(), VR);
+ VRegs.erase(I);
+
+ // Add to new register class's vregs list.
+ RegClass2VRegMap[RC->getID()].push_back(VR);
+ }
/// createVirtualRegister - Create and return a new virtual register in the
/// function with the specified register class.
///
- unsigned createVirtualRegister(const TargetRegisterClass *RegClass) {
- assert(RegClass && "Cannot create register without RegClass!");
- // Add a reg, but keep track of whether the vector reallocated or not.
- void *ArrayBase = VRegInfo.empty() ? 0 : &VRegInfo[0];
- VRegInfo.push_back(std::make_pair(RegClass, (MachineOperand*)0));
-
- if (&VRegInfo[0] == ArrayBase || VRegInfo.size() == 1)
- return getLastVirtReg();
-
- // Otherwise, the vector reallocated, handle this now.
- HandleVRegListReallocation();
- return getLastVirtReg();
- }
+ unsigned createVirtualRegister(const TargetRegisterClass *RegClass);
/// getLastVirtReg - Return the highest currently assigned virtual register.
///
unsigned getLastVirtReg() const {
- return VRegInfo.size()+MRegisterInfo::FirstVirtualRegister-1;
+ return (unsigned)VRegInfo.size()+TargetRegisterInfo::FirstVirtualRegister-1;
+ }
+
+ /// getRegClassVirtRegs - Return the list of virtual registers of the given
+ /// target register class.
+ std::vector<unsigned> &getRegClassVirtRegs(const TargetRegisterClass *RC) {
+ return RegClass2VRegMap[RC->getID()];
}
-
- /// getVRegDef - Return the machine instr that defines the specified virtual
- /// register or null if none is found. This assumes that the code is in SSA
- /// form, so there should only be one definition.
- MachineInstr *getVRegDef(unsigned Reg) const;
-
//===--------------------------------------------------------------------===//
// Physical Register Use Info
liveout_iterator liveout_begin() const { return LiveOuts.begin(); }
liveout_iterator liveout_end() const { return LiveOuts.end(); }
bool liveout_empty() const { return LiveOuts.empty(); }
+
+ bool isLiveIn(unsigned Reg) const {
+ for (livein_iterator I = livein_begin(), E = livein_end(); I != E; ++I)
+ if (I->first == Reg || I->second == Reg)
+ return true;
+ return false;
+ }
+
private:
void HandleVRegListReallocation();
public:
- /// reg_iterator - This class provides iterator support for machine
- /// operands in the function that use or define a specific register.
- class reg_iterator : public forward_iterator<MachineInstr, ptrdiff_t> {
+ /// defusechain_iterator - This class provides iterator support for machine
+ /// operands in the function that use or define a specific register. If
+ /// ReturnUses is true it returns uses of registers, if ReturnDefs is true it
+ /// returns defs. If neither are true then you are silly and it always
+ /// returns end().
+ template<bool ReturnUses, bool ReturnDefs>
+ class defusechain_iterator
+ : public forward_iterator<MachineInstr, ptrdiff_t> {
MachineOperand *Op;
- reg_iterator(MachineOperand *op) : Op(op) {}
+ explicit defusechain_iterator(MachineOperand *op) : Op(op) {
+ // If the first node isn't one we're interested in, advance to one that
+ // we are interested in.
+ if (op) {
+ if ((!ReturnUses && op->isUse()) ||
+ (!ReturnDefs && op->isDef()))
+ ++*this;
+ }
+ }
friend class MachineRegisterInfo;
public:
typedef forward_iterator<MachineInstr, ptrdiff_t>::reference reference;
typedef forward_iterator<MachineInstr, ptrdiff_t>::pointer pointer;
- reg_iterator(const reg_iterator &I) : Op(I.Op) {}
- reg_iterator() : Op(0) {}
+ defusechain_iterator(const defusechain_iterator &I) : Op(I.Op) {}
+ defusechain_iterator() : Op(0) {}
- bool operator==(const reg_iterator &x) const {
+ bool operator==(const defusechain_iterator &x) const {
return Op == x.Op;
}
- bool operator!=(const reg_iterator &x) const {
+ bool operator!=(const defusechain_iterator &x) const {
return !operator==(x);
}
bool atEnd() const { return Op == 0; }
// Iterator traversal: forward iteration only
- reg_iterator &operator++() { // Preincrement
+ defusechain_iterator &operator++() { // Preincrement
assert(Op && "Cannot increment end iterator!");
Op = Op->getNextOperandForReg();
+
+ // If this is an operand we don't care about, skip it.
+ while (Op && ((!ReturnUses && Op->isUse()) ||
+ (!ReturnDefs && Op->isDef())))
+ Op = Op->getNextOperandForReg();
+
return *this;
}
- reg_iterator operator++(int) { // Postincrement
- reg_iterator tmp = *this; ++*this; return tmp;
+ defusechain_iterator operator++(int) { // Postincrement
+ defusechain_iterator tmp = *this; ++*this; return tmp;
}
MachineOperand &getOperand() const {
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