class MachineMove;
class RegScavenger;
template<class T> class SmallVectorImpl;
+class raw_ostream;
/// TargetRegisterDesc - This record contains all of the information known about
-/// a particular register. The AliasSet field (if not null) contains a pointer
-/// to a Zero terminated array of registers that this register aliases. This is
-/// needed for architectures like X86 which have AL alias AX alias EAX.
-/// Registers that this does not apply to simply should set this to null.
-/// The SubRegs field is a zero terminated array of registers that are
-/// sub-registers of the specific register, e.g. AL, AH are sub-registers of AX.
-/// The SuperRegs field is a zero terminated array of registers that are
+/// a particular register. The Overlaps field contains a pointer to a zero
+/// terminated array of registers that this register aliases, starting with
+/// itself. This is needed for architectures like X86 which have AL alias AX
+/// alias EAX. The SubRegs field is a zero terminated array of registers that
+/// are sub-registers of the specific register, e.g. AL, AH are sub-registers of
+/// AX. The SuperRegs field is a zero terminated array of registers that are
/// super-registers of the specific register, e.g. RAX, EAX, are super-registers
/// of AX.
///
struct TargetRegisterDesc {
const char *Name; // Printable name for the reg (for debugging)
- const unsigned *AliasSet; // Register Alias Set, described above
+ const unsigned *Overlaps; // Overlapping registers, described above
const unsigned *SubRegs; // Sub-register set, described above
const unsigned *SuperRegs; // Super-register set, described above
};
return Reg >= FirstVirtualRegister;
}
+ /// virtReg2Index - Convert a virtual register number to a 0-based index.
+ /// The first virtual register in a function will get the index 0.
+ static unsigned virtReg2Index(unsigned Reg) {
+ return Reg - FirstVirtualRegister;
+ }
+
+ /// index2VirtReg - Convert a 0-based index to a virtual register number.
+ /// This is the inverse operation of VirtReg2IndexFunctor below.
+ static unsigned index2VirtReg(unsigned Index) {
+ return Index + FirstVirtualRegister;
+ }
+
/// getMinimalPhysRegClass - Returns the Register Class of a physical
/// register of the given type, picking the most sub register class of
/// the right type that contains this physreg.
/// terminated.
///
const unsigned *getAliasSet(unsigned RegNo) const {
- return get(RegNo).AliasSet;
+ // The Overlaps set always begins with Reg itself.
+ return get(RegNo).Overlaps + 1;
+ }
+
+ /// getOverlaps - Return a list of registers that overlap Reg, including
+ /// itself. This is the same as the alias set except Reg is included in the
+ /// list.
+ /// These are exactly the registers in { x | regsOverlap(x, Reg) }.
+ ///
+ const unsigned *getOverlaps(unsigned RegNo) const {
+ return get(RegNo).Overlaps;
}
/// getSubRegisters - Return the list of registers that are sub-registers of
/// materializeFrameBaseRegister - Insert defining instruction(s) for
/// BaseReg to be a pointer to FrameIdx before insertion point I.
- virtual void materializeFrameBaseRegister(MachineBasicBlock::iterator I,
+ virtual void materializeFrameBaseRegister(MachineBasicBlock *MBB,
unsigned BaseReg, int FrameIdx,
int64_t Offset) const {
assert(0 && "materializeFrameBaseRegister does not exist on this target");
assert(0 && "Call Frame Pseudo Instructions do not exist on this target!");
}
- /// processFunctionBeforeCalleeSavedScan - This method is called immediately
- /// before PrologEpilogInserter scans the physical registers used to determine
- /// what callee saved registers should be spilled. This method is optional.
- virtual void processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
- RegScavenger *RS = NULL) const {
-
- }
-
- /// processFunctionBeforeFrameFinalized - This method is called immediately
- /// before the specified function's frame layout (MF.getFrameInfo()) is
- /// finalized. Once the frame is finalized, MO_FrameIndex operands are
- /// replaced with direct constants. This method is optional.
- ///
- virtual void processFunctionBeforeFrameFinalized(MachineFunction &MF) const {
- }
/// saveScavengerRegister - Spill the register so it can be used by the
/// register scavenger. Return true if the register was spilled, false
// This is useful when building IndexedMaps keyed on virtual registers
struct VirtReg2IndexFunctor : public std::unary_function<unsigned, unsigned> {
unsigned operator()(unsigned Reg) const {
- return Reg - TargetRegisterInfo::FirstVirtualRegister;
+ return TargetRegisterInfo::virtReg2Index(Reg);
}
};
const TargetRegisterClass *getCommonSubClass(const TargetRegisterClass *A,
const TargetRegisterClass *B);
+/// PrintReg - Helper class for printing registers on a raw_ostream.
+/// Prints virtual and physical registers with or without a TRI instance.
+///
+/// The format is:
+/// %noreg - NoRegister
+/// %reg5 - a virtual register.
+/// %reg5:sub_8bit - a virtual register with sub-register index (with TRI).
+/// %EAX - a physical register
+/// %physreg17 - a physical register when no TRI instance given.
+///
+/// Usage: OS << PrintReg(Reg, TRI) << '\n';
+///
+class PrintReg {
+ const TargetRegisterInfo *TRI;
+ unsigned Reg;
+ unsigned SubIdx;
+public:
+ PrintReg(unsigned reg, const TargetRegisterInfo *tri = 0, unsigned subidx = 0)
+ : TRI(tri), Reg(reg), SubIdx(subidx) {}
+ void print(raw_ostream&) const;
+};
+
+static inline raw_ostream &operator<<(raw_ostream &OS, const PrintReg &PR) {
+ PR.print(OS);
+ return OS;
+}
+
} // End llvm namespace
#endif
projects / oota-llvm.git / blobdiff