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//===-- SparcRegClassInfo.h - Register class def'ns for Sparc ----*- C++ -*--=//
//
// This file defines the register classes used by the Sparc target description.
//
//===----------------------------------------------------------------------===//
#ifndef SPARC_REG_CLASS_INFO_H
#define SPARC_REG_CLASS_INFO_H
#include "llvm/Target/TargetRegInfo.h"
//-----------------------------------------------------------------------------
// Integer Register Class
//-----------------------------------------------------------------------------
struct SparcIntRegClass : public TargetRegClassInfo {
SparcIntRegClass(unsigned ID)
: TargetRegClassInfo(ID, NumOfAvailRegs, NumOfAllRegs) { }
void colorIGNode(IGNode *Node,
const std::vector<bool> &IsColorUsedArr) const;
inline bool isRegVolatile(int Reg) const {
return (Reg < (int)StartOfNonVolatileRegs);
}
inline bool modifiedByCall(int Reg) const {
return Reg==(int)ModifiedByCall;
}
enum { // colors possible for a LR (in preferred order)
// --- following colors are volatile across function calls
// %g0 can't be used for coloring - always 0
o0, o1, o2, o3, o4, o5, o7, // %o0-%o5,
// %o6 is sp,
// all %0's can get modified by a call
// --- following colors are NON-volatile across function calls
l0, l1, l2, l3, l4, l5, l6, l7, // %l0-%l7
i0, i1, i2, i3, i4, i5, // %i0-%i5: i's need not be preserved
// %i6 is the fp - so not allocated
// %i7 is the ret address by convention - can be used for others
// max # of colors reg coloring can allocate (NumOfAvailRegs)
// --- following colors are not available for allocation within this phase
// --- but can appear for pre-colored ranges
i6, i7, g0, g1, g2, g3, g4, g5, g6, g7, o6,
NumOfAllRegs, // Must be first AFTER registers...
//*** NOTE: If we decide to use some %g regs, they are volatile
// (see sparc64ABI)
// Move the %g regs from the end of the enumeration to just above the
// enumeration of %o0 (change StartOfAllRegs below)
// change isRegVloatile method below
// Also change IntRegNames above.
// max # of colors reg coloring can allocate
NumOfAvailRegs = i6,
StartOfNonVolatileRegs = l0,
StartOfAllRegs = o0,
ModifiedByCall = o7,
};
const char * const getRegName(unsigned reg) const;
};
//-----------------------------------------------------------------------------
// Float Register Class
//-----------------------------------------------------------------------------
class SparcFloatRegClass : public TargetRegClassInfo {
int findFloatColor(const LiveRange *LR, unsigned Start,
unsigned End,
const std::vector<bool> &IsColorUsedArr) const;
public:
SparcFloatRegClass(unsigned ID)
: TargetRegClassInfo(ID, NumOfAvailRegs, NumOfAllRegs) {}
// This method marks the registers used for a given register number.
// This marks a single register for Float regs, but the R,R+1 pair
// for double-precision registers.
//
virtual void markColorsUsed(unsigned RegInClass,
int UserRegType,
int RegTypeWanted,
std::vector<bool> &IsColorUsedArr) const;
// This method finds unused registers of the specified register type,
// using the given "used" flag array IsColorUsedArr. It checks a single
// entry in the array directly for float regs, and checks the pair [R,R+1]
// for double-precision registers
// It returns -1 if no unused color is found.
//
virtual int findUnusedColor(int RegTypeWanted,
const std::vector<bool> &IsColorUsedArr) const;
void colorIGNode(IGNode *Node,
const std::vector<bool> &IsColorUsedArr) const;
// according to Sparc 64 ABI, all %fp regs are volatile
inline bool isRegVolatile(int Reg) const { return true; }
enum {
f0, f1, f2, f3, f4, f5, f6, f7, f8, f9,
f10, f11, f12, f13, f14, f15, f16, f17, f18, f19,
f20, f21, f22, f23, f24, f25, f26, f27, f28, f29,
f30, f31, f32, f33, f34, f35, f36, f37, f38, f39,
f40, f41, f42, f43, f44, f45, f46, f47, f48, f49,
f50, f51, f52, f53, f54, f55, f56, f57, f58, f59,
f60, f61, f62, f63,
// there are 64 regs alltogether but only 32 regs can be allocated at
// a time.
//
NumOfAvailRegs = 32,
NumOfAllRegs = 64,
StartOfNonVolatileRegs = f32,
StartOfAllRegs = f0,
};
const char * const getRegName(unsigned reg) const;
};
//-----------------------------------------------------------------------------
// Int CC Register Class
// Only one integer cc register is available. However, this register is
// referred to as %xcc or %icc when instructions like subcc are executed but
// referred to as %ccr (i.e., %xcc . %icc") when this register is moved
// into an integer register using RD or WR instrcutions. So, three ids are
// allocated for the three names.
//-----------------------------------------------------------------------------
struct SparcIntCCRegClass : public TargetRegClassInfo {
SparcIntCCRegClass(unsigned ID)
: TargetRegClassInfo(ID, 1, 3) { }
void colorIGNode(IGNode *Node,
const std::vector<bool> &IsColorUsedArr) const;
// according to Sparc 64 ABI, %ccr is volatile
//
inline bool isRegVolatile(int Reg) const { return true; }
enum {
xcc, icc, ccr // only one is available - see the note above
};
const char * const getRegName(unsigned reg) const;
};
//-----------------------------------------------------------------------------
// Float CC Register Class
// Only 4 Float CC registers are available for allocation.
//-----------------------------------------------------------------------------
struct SparcFloatCCRegClass : public TargetRegClassInfo {
SparcFloatCCRegClass(unsigned ID)
: TargetRegClassInfo(ID, 4, 5) { }
void colorIGNode(IGNode *Node,
const std::vector<bool> &IsColorUsedArr) const;
// according to Sparc 64 ABI, all %fp CC regs are volatile
//
inline bool isRegVolatile(int Reg) const { return true; }
enum {
fcc0, fcc1, fcc2, fcc3, fsr // fsr is not used in allocation
}; // but has a name in getRegName()
const char * const getRegName(unsigned reg) const;
};
//-----------------------------------------------------------------------------
// Sparc special register class. These registers are not used for allocation
// but are used as arguments of some instructions.
//-----------------------------------------------------------------------------
struct SparcSpecialRegClass : public TargetRegClassInfo {
SparcSpecialRegClass(unsigned ID)
: TargetRegClassInfo(ID, 0, 1) { }
void colorIGNode(IGNode *Node,
const std::vector<bool> &IsColorUsedArr) const {
assert(0 && "SparcSpecialRegClass should never be used for allocation");
}
// all currently included special regs are volatile
inline bool isRegVolatile(int Reg) const { return true; }
enum {
fsr // floating point state register
};
const char * const getRegName(unsigned reg) const;
};
#endif
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