#include "llvm/CodeGen/MachineBasicBlock.h"
#include <cassert>
+#include <functional>
namespace llvm {
class Type;
class MachineFunction;
+class MachineInstr;
/// MRegisterDesc - This record contains all of the information known about a
/// particular register. The AliasSet field (if not null) contains a pointer to
/// Registers that this does not apply to simply should set this to null.
///
struct MRegisterDesc {
- const char *Name; // Assembly language name for the register
- const unsigned *AliasSet; // Register Alias Set, described above
- unsigned Flags; // Flags identifying register properties (below)
- unsigned TSFlags; // Target Specific Flags
+ const char *Name; // Assembly language name for the register
+ const unsigned *AliasSet; // Register Alias Set, described above
+ unsigned char SpillSize; // Size of this register in bytes
+ unsigned char SpillAlignment; // Alignment of stack slot for this reg
};
class TargetRegisterClass {
return RegsBegin[i];
}
+ /// contains - Return true if the specified register is included in this
+ /// register class.
+ bool contains(unsigned Reg) const {
+ for (iterator I = begin(), E = end(); I != E; ++I)
+ if (*I == Reg) return true;
+ return false;
+ }
+
/// allocation_order_begin/end - These methods define a range of registers
/// which specify the registers in this class that are valid to register
/// allocate, and the preferred order to allocate them in. For example,
FirstVirtualRegister = 1024,
};
+ /// isPhysicalRegister - Return true if the specified register number is in
+ /// the physical register namespace.
+ static bool isPhysicalRegister(unsigned Reg) {
+ assert(Reg && "this is not a register!");
+ return Reg < FirstVirtualRegister;
+ }
+
+ /// isVirtualRegister - Return true if the specified register number is in
+ /// the virtual register namespace.
+ static bool isVirtualRegister(unsigned Reg) {
+ assert(Reg && "this is not a register!");
+ return Reg >= FirstVirtualRegister;
+ }
+
+ /// getAllocatableSet - Returns a bitset indexed by register number
+ /// indicating if a register is allocatable or not.
+ std::vector<bool> getAllocatableSet(MachineFunction &MF) const;
+
const MRegisterDesc &operator[](unsigned RegNo) const {
assert(RegNo < NumRegs &&
"Attempting to access record for invalid register number!");
return get(RegNo).Name;
}
+ /// getSpillSize - Return the size in bits required of a stack slot used to
+ /// spill register into.
+ unsigned getSpillSize(unsigned RegNo) const {
+ return get(RegNo).SpillSize;
+ }
+
+ /// getSpillAlignment - Return the alignment required by a stack slot used to
+ /// spill register into.
+ unsigned getSpillAlignment(unsigned RegNo) const {
+ return get(RegNo).SpillAlignment;
+ }
+
+ /// getNumRegs - Return the number of registers this target has
+ /// (useful for sizing arrays holding per register information)
+ unsigned getNumRegs() const {
+ return NumRegs;
+ }
+
+ /// areAliases - Returns true if the two registers alias each other,
+ /// false otherwise
+ bool areAliases(unsigned regA, unsigned regB) const {
+ for (const unsigned *Alias = getAliasSet(regA); *Alias; ++Alias)
+ if (*Alias == regB) return true;
+ return false;
+ }
+
virtual const unsigned* getCalleeSaveRegs() const = 0;
return regclass_end()-regclass_begin();
}
- //===--------------------------------------------------------------------===//
- // All basic block modifier functions below return the number of
- // instructions added to (negative if removed from) the basic block
- // passed as their first argument.
- //
- // FIXME: This is only needed because we use a std::vector instead
- // of an ilist to keep MachineBasicBlock instructions. Inserting an
- // instruction to a MachineBasicBlock invalidates all iterators to
- // the basic block. The return value can be used to update an index
- // to the machine basic block instruction vector and circumvent the
- // iterator elimination problem but this is really not needed if we
- // move to a better representation.
- //
-
//===--------------------------------------------------------------------===//
// Interfaces used by the register allocator and stack frame
// manipulation passes to move data around between registers,
// instructions added to (negative if removed from) the basic block.
//
- virtual int storeRegToStackSlot(MachineBasicBlock &MBB,
- MachineBasicBlock::iterator &MBBI,
- unsigned SrcReg, int FrameIndex,
- const TargetRegisterClass *RC) const = 0;
-
- virtual int loadRegFromStackSlot(MachineBasicBlock &MBB,
- MachineBasicBlock::iterator &MBBI,
- unsigned DestReg, int FrameIndex,
- const TargetRegisterClass *RC) const = 0;
-
- virtual int copyRegToReg(MachineBasicBlock &MBB,
- MachineBasicBlock::iterator &MBBI,
- unsigned DestReg, unsigned SrcReg,
- const TargetRegisterClass *RC) const = 0;
-
+ virtual void storeRegToStackSlot(MachineBasicBlock &MBB,
+ MachineBasicBlock::iterator MI,
+ unsigned SrcReg, int FrameIndex) const = 0;
+
+ virtual void loadRegFromStackSlot(MachineBasicBlock &MBB,
+ MachineBasicBlock::iterator MI,
+ unsigned DestReg, int FrameIndex) const = 0;
+
+ virtual void copyRegToReg(MachineBasicBlock &MBB,
+ MachineBasicBlock::iterator MI,
+ unsigned DestReg, unsigned SrcReg,
+ const TargetRegisterClass *RC) const = 0;
+
+
+ /// foldMemoryOperand - Attempt to fold a load or store of the
+ /// specified stack slot into the specified machine instruction for
+ /// the specified operand. If this is possible, a new instruction
+ /// is returned with the specified operand folded, otherwise NULL is
+ /// returned. The client is responsible for removing the old
+ /// instruction and adding the new one in the instruction stream
+ virtual MachineInstr* foldMemoryOperand(MachineInstr* MI,
+ unsigned OpNum,
+ int FrameIndex) const {
+ return 0;
+ }
/// getCallFrameSetup/DestroyOpcode - These methods return the opcode of the
/// frame setup/destroy instructions if they exist (-1 otherwise). Some
/// instructions (but only if the Target is using them). It is responsible
/// for eliminating these instructions, replacing them with concrete
/// instructions. This method need only be implemented if using call frame
- /// setup/destroy pseudo instructions. The return value is the number of
- /// instructions added to (negative if removed from) the basic block.
+ /// setup/destroy pseudo instructions.
///
- virtual int eliminateCallFramePseudoInstr(MachineFunction &MF,
- MachineBasicBlock &MBB,
- MachineBasicBlock::iterator &I) const {
+ virtual void
+ eliminateCallFramePseudoInstr(MachineFunction &MF,
+ MachineBasicBlock &MBB,
+ MachineBasicBlock::iterator MI) const {
assert(getCallFrameSetupOpcode()== -1 && getCallFrameDestroyOpcode()== -1 &&
"eliminateCallFramePseudoInstr must be implemented if using"
" call frame setup/destroy pseudo instructions!");
assert(0 && "Call Frame Pseudo Instructions do not exist on this target!");
- return -1;
}
/// processFunctionBeforeFrameFinalized - This method is called immediately
/// is the number of instructions added to (negative if removed from) the
/// basic block
///
- virtual int processFunctionBeforeFrameFinalized(MachineFunction &MF) const {
- return 0;
+ virtual void processFunctionBeforeFrameFinalized(MachineFunction &MF) const {
}
/// eliminateFrameIndex - This method must be overriden to eliminate abstract
/// finished product. The return value is the number of instructions
/// added to (negative if removed from) the basic block.
///
- virtual int eliminateFrameIndex(MachineFunction &MF,
- MachineBasicBlock::iterator &II) const = 0;
+ virtual void eliminateFrameIndex(MachineBasicBlock::iterator MI) const = 0;
/// emitProlog/emitEpilog - These methods insert prolog and epilog code into
/// the function. The return value is the number of instructions
/// added to (negative if removed from) the basic block (entry for prologue).
///
- virtual int emitPrologue(MachineFunction &MF) const = 0;
- virtual int emitEpilogue(MachineFunction &MF,
- MachineBasicBlock &MBB) const = 0;
+ virtual void emitPrologue(MachineFunction &MF) const = 0;
+ virtual void emitEpilogue(MachineFunction &MF,
+ MachineBasicBlock &MBB) const = 0;
+};
+
+// This is useful when building DenseMaps keyed on virtual registers
+struct VirtReg2IndexFunctor : std::unary_function<unsigned, unsigned> {
+ unsigned operator()(unsigned Reg) const {
+ return Reg - MRegisterInfo::FirstVirtualRegister;
+ }
};
} // End llvm namespace
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