#include "llvm/CodeGen/MachineBasicBlock.h"
#include "llvm/CodeGen/ValueTypes.h"
#include "llvm/ADT/ArrayRef.h"
-#include "llvm/ADT/DenseSet.h"
+#include "llvm/CallingConv.h"
#include <cassert>
#include <functional>
template<class T> class SmallVectorImpl;
class raw_ostream;
-class TargetRegisterClass : public MCRegisterClass {
+class TargetRegisterClass {
public:
+ typedef const unsigned* iterator;
+ typedef const unsigned* const_iterator;
typedef const EVT* vt_iterator;
typedef const TargetRegisterClass* const * sc_iterator;
private:
+ virtual void anchor();
+ const MCRegisterClass *MC;
const vt_iterator VTs;
- const sc_iterator SubClasses;
+ const unsigned *SubClassMask;
const sc_iterator SuperClasses;
- const sc_iterator SubRegClasses;
const sc_iterator SuperRegClasses;
public:
- TargetRegisterClass(unsigned id, const char *name, const EVT *vts,
- const TargetRegisterClass * const *subcs,
+ TargetRegisterClass(const MCRegisterClass *MC, const EVT *vts,
+ const unsigned *subcm,
const TargetRegisterClass * const *supcs,
- const TargetRegisterClass * const *subregcs,
- const TargetRegisterClass * const *superregcs,
- unsigned RS, unsigned Al, int CC, bool Allocable,
- iterator RB, iterator RE)
- : MCRegisterClass(id, name, RS, Al, CC, Allocable, RB, RE),
- VTs(vts), SubClasses(subcs), SuperClasses(supcs), SubRegClasses(subregcs),
- SuperRegClasses(superregcs) {
- initMCRegisterClass();
- }
+ const TargetRegisterClass * const *superregcs)
+ : MC(MC), VTs(vts), SubClassMask(subcm), SuperClasses(supcs),
+ SuperRegClasses(superregcs) {}
virtual ~TargetRegisterClass() {} // Allow subclasses
+ /// getID() - Return the register class ID number.
+ ///
+ unsigned getID() const { return MC->getID(); }
+
+ /// getName() - Return the register class name for debugging.
+ ///
+ const char *getName() const { return MC->getName(); }
+
+ /// begin/end - Return all of the registers in this class.
+ ///
+ iterator begin() const { return MC->begin(); }
+ iterator end() const { return MC->end(); }
+
+ /// getNumRegs - Return the number of registers in this class.
+ ///
+ unsigned getNumRegs() const { return MC->getNumRegs(); }
+
+ /// getRegister - Return the specified register in the class.
+ ///
+ unsigned getRegister(unsigned i) const {
+ return MC->getRegister(i);
+ }
+
+ /// contains - Return true if the specified register is included in this
+ /// register class. This does not include virtual registers.
+ bool contains(unsigned Reg) const {
+ return MC->contains(Reg);
+ }
+
+ /// contains - Return true if both registers are in this class.
+ bool contains(unsigned Reg1, unsigned Reg2) const {
+ return MC->contains(Reg1, Reg2);
+ }
+
+ /// getSize - Return the size of the register in bytes, which is also the size
+ /// of a stack slot allocated to hold a spilled copy of this register.
+ unsigned getSize() const { return MC->getSize(); }
+
+ /// getAlignment - Return the minimum required alignment for a register of
+ /// this class.
+ unsigned getAlignment() const { return MC->getAlignment(); }
+
+ /// getCopyCost - Return the cost of copying a value between two registers in
+ /// this class. A negative number means the register class is very expensive
+ /// to copy e.g. status flag register classes.
+ int getCopyCost() const { return MC->getCopyCost(); }
+
+ /// isAllocatable - Return true if this register class may be used to create
+ /// virtual registers.
+ bool isAllocatable() const { return MC->isAllocatable(); }
+
/// hasType - return true if this TargetRegisterClass has the ValueType vt.
///
bool hasType(EVT vt) const {
return I;
}
- /// subregclasses_begin / subregclasses_end - Loop over all of
- /// the subreg register classes of this register class.
- sc_iterator subregclasses_begin() const {
- return SubRegClasses;
- }
-
- sc_iterator subregclasses_end() const {
- sc_iterator I = SubRegClasses;
- while (*I != NULL) ++I;
- return I;
- }
-
- /// getSubRegisterRegClass - Return the register class of subregisters with
- /// index SubIdx, or NULL if no such class exists.
- const TargetRegisterClass* getSubRegisterRegClass(unsigned SubIdx) const {
- assert(SubIdx>0 && "Invalid subregister index");
- return SubRegClasses[SubIdx-1];
- }
-
/// superregclasses_begin / superregclasses_end - Loop over all of
/// the superreg register classes of this register class.
sc_iterator superregclasses_begin() const {
}
/// hasSubClass - return true if the specified TargetRegisterClass
- /// is a proper subset of this TargetRegisterClass.
- bool hasSubClass(const TargetRegisterClass *cs) const {
- for (int i = 0; SubClasses[i] != NULL; ++i)
- if (SubClasses[i] == cs)
- return true;
- return false;
+ /// is a proper sub-class of this TargetRegisterClass.
+ bool hasSubClass(const TargetRegisterClass *RC) const {
+ return RC != this && hasSubClassEq(RC);
}
- /// hasSubClassEq - Returns true if RC is a subclass of or equal to this
+ /// hasSubClassEq - Returns true if RC is a sub-class of or equal to this
/// class.
bool hasSubClassEq(const TargetRegisterClass *RC) const {
- return RC == this || hasSubClass(RC);
- }
-
- /// subclasses_begin / subclasses_end - Loop over all of the classes
- /// that are proper subsets of this register class.
- sc_iterator subclasses_begin() const {
- return SubClasses;
- }
-
- sc_iterator subclasses_end() const {
- sc_iterator I = SubClasses;
- while (*I != NULL) ++I;
- return I;
+ unsigned ID = RC->getID();
+ return (SubClassMask[ID / 32] >> (ID % 32)) & 1;
}
/// hasSuperClass - return true if the specified TargetRegisterClass is a
- /// proper superset of this TargetRegisterClass.
- bool hasSuperClass(const TargetRegisterClass *cs) const {
- for (int i = 0; SuperClasses[i] != NULL; ++i)
- if (SuperClasses[i] == cs)
- return true;
- return false;
+ /// proper super-class of this TargetRegisterClass.
+ bool hasSuperClass(const TargetRegisterClass *RC) const {
+ return RC->hasSubClass(this);
}
- /// hasSuperClassEq - Returns true if RC is a superclass of or equal to this
+ /// hasSuperClassEq - Returns true if RC is a super-class of or equal to this
/// class.
bool hasSuperClassEq(const TargetRegisterClass *RC) const {
- return RC == this || hasSuperClass(RC);
+ return RC->hasSubClassEq(this);
}
- /// superclasses_begin / superclasses_end - Loop over all of the classes
- /// that are proper supersets of this register class.
- sc_iterator superclasses_begin() const {
- return SuperClasses;
+ /// getSubClassMask - Returns a bit vector of subclasses, including this one.
+ /// The vector is indexed by class IDs, see hasSubClassEq() above for how to
+ /// use it.
+ const unsigned *getSubClassMask() const {
+ return SubClassMask;
}
- sc_iterator superclasses_end() const {
- sc_iterator I = SuperClasses;
- while (*I != NULL) ++I;
- return I;
+ /// getSuperClasses - Returns a NULL terminated list of super-classes. The
+ /// classes are ordered by ID which is also a topological ordering from large
+ /// to small classes. The list does NOT include the current class.
+ sc_iterator getSuperClasses() const {
+ return SuperClasses;
}
/// isASubClass - return true if this TargetRegisterClass is a subset
/// getCalleeSavedRegs - Return a null-terminated list of all of the
/// callee saved registers on this target. The register should be in the
/// order of desired callee-save stack frame offset. The first register is
- /// closed to the incoming stack pointer if stack grows down, and vice versa.
+ /// closest to the incoming stack pointer if stack grows down, and vice versa.
+ ///
virtual const unsigned* getCalleeSavedRegs(const MachineFunction *MF = 0)
const = 0;
+ /// getCallPreservedMask - Return a mask of call-preserved registers for the
+ /// given calling convention on the current sub-target. The mask should
+ /// include all call-preserved aliases. This is used by the register
+ /// allocator to determine which registers can be live across a call.
+ ///
+ /// The mask is an array containing (TRI::getNumRegs()+31)/32 entries.
+ /// A set bit indicates that all bits of the corresponding register are
+ /// preserved across the function call. The bit mask is expected to be
+ /// sub-register complete, i.e. if A is preserved, so are all its
+ /// sub-registers.
+ ///
+ /// Bits are numbered from the LSB, so the bit for physical register Reg can
+ /// be found as (Mask[Reg / 32] >> Reg % 32) & 1.
+ /// NULL pointer is equivalent to an all-zero mask.
+ ///
+ virtual const uint32_t *getCallPreservedMask(CallingConv::ID) const {
+ // The default mask clobbers everything. All targets should override.
+ return 0;
+ }
/// getReservedRegs - Returns a bitset indexed by physical register number
/// indicating if a register is a special register that has particular uses
/// getMatchingSuperRegClass - Return a subclass of the specified register
/// class A so that each register in it has a sub-register of the
/// specified sub-register index which is in the specified register class B.
+ ///
+ /// TableGen will synthesize missing A sub-classes.
virtual const TargetRegisterClass *
getMatchingSuperRegClass(const TargetRegisterClass *A,
- const TargetRegisterClass *B, unsigned Idx) const {
- return 0;
- }
+ const TargetRegisterClass *B, unsigned Idx) const =0;
+
+ /// getSubClassWithSubReg - Returns the largest legal sub-class of RC that
+ /// supports the sub-register index Idx.
+ /// If no such sub-class exists, return NULL.
+ /// If all registers in RC already have an Idx sub-register, return RC.
+ ///
+ /// TableGen generates a version of this function that is good enough in most
+ /// cases. Targets can override if they have constraints that TableGen
+ /// doesn't understand. For example, the x86 sub_8bit sub-register index is
+ /// supported by the full GR32 register class in 64-bit mode, but only by the
+ /// GR32_ABCD regiister class in 32-bit mode.
+ ///
+ /// TableGen will synthesize missing RC sub-classes.
+ virtual const TargetRegisterClass *
+ getSubClassWithSubReg(const TargetRegisterClass *RC, unsigned Idx) const =0;
/// composeSubRegIndices - Return the subregister index you get from composing
/// two subregister indices.
return RegClassBegin[i];
}
+ /// getCommonSubClass - find the largest common subclass of A and B. Return
+ /// NULL if there is no common subclass.
+ const TargetRegisterClass *
+ getCommonSubClass(const TargetRegisterClass *A,
+ const TargetRegisterClass *B) const;
+
/// getPointerRegClass - Returns a TargetRegisterClass used for pointer
/// values. If a target supports multiple different pointer register classes,
/// kind specifies which one is indicated.
}
};
-/// getCommonSubClass - find the largest common subclass of A and B. Return NULL
-/// if there is no common subclass.
-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.
///