//===- AlphaRegisterInfo.td - The Alpha Register File ------*- tablegen -*-===//
// 
//                     The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
// 
//===----------------------------------------------------------------------===//
//
// This file describes the Alpha register set.
//
//===----------------------------------------------------------------------===//

class AlphaReg<string n> : Register<n> {
  field bits<5> Num;
  let Namespace = "Alpha";
}

// We identify all our registers with a 5-bit ID, for consistency's sake.

// GPR - One of the 32 32-bit general-purpose registers
class GPR<bits<5> num, string n> : AlphaReg<n> {
  let Num = num;
}

// FPR - One of the 32 64-bit floating-point registers
class FPR<bits<5> num, string n> : AlphaReg<n> {
  let Num = num;
}

//#define FP    $15
//#define RA    $26
//#define PV    $27
//#define GP    $29
//#define SP    $30

// General-purpose registers
def R0  : GPR< 0,  "$0">;  def R1  : GPR< 1,  "$1">;
def R2  : GPR< 2,  "$2">;  def R3  : GPR< 3,  "$3">;
def R4  : GPR< 4,  "$4">;  def R5  : GPR< 5,  "$5">;
def R6  : GPR< 6,  "$6">;  def R7  : GPR< 7,  "$7">;
def R8  : GPR< 8,  "$8">;  def R9  : GPR< 9,  "$9">;
def R10 : GPR<10, "$10">;  def R11 : GPR<11, "$11">;
def R12 : GPR<12, "$12">;  def R13 : GPR<13, "$13">;
def R14 : GPR<14, "$14">;  def R15 : GPR<15, "$15">;
def R16 : GPR<16, "$16">;  def R17 : GPR<17, "$17">;
def R18 : GPR<18, "$18">;  def R19 : GPR<19, "$19">;
def R20 : GPR<20, "$20">;  def R21 : GPR<21, "$21">;
def R22 : GPR<22, "$22">;  def R23 : GPR<23, "$23">;
def R24 : GPR<24, "$24">;  def R25 : GPR<25, "$25">;
def R26 : GPR<26, "$26">;  def R27 : GPR<27, "$27">;
def R28 : GPR<28, "$28">;  def R29 : GPR<29, "$29">;
def R30 : GPR<30, "$30">;  def R31 : GPR<31, "$31">;

// Floating-point registers
def F0  : FPR< 0,  "$f0">;  def F1  : FPR< 1,  "$f1">;
def F2  : FPR< 2,  "$f2">;  def F3  : FPR< 3,  "$f3">;
def F4  : FPR< 4,  "$f4">;  def F5  : FPR< 5,  "$f5">;
def F6  : FPR< 6,  "$f6">;  def F7  : FPR< 7,  "$f7">;
def F8  : FPR< 8,  "$f8">;  def F9  : FPR< 9,  "$f9">;
def F10 : FPR<10, "$f10">;  def F11 : FPR<11, "$f11">;
def F12 : FPR<12, "$f12">;  def F13 : FPR<13, "$f13">;
def F14 : FPR<14, "$f14">;  def F15 : FPR<15, "$f15">;
def F16 : FPR<16, "$f16">;  def F17 : FPR<17, "$f17">;
def F18 : FPR<18, "$f18">;  def F19 : FPR<19, "$f19">;
def F20 : FPR<20, "$f20">;  def F21 : FPR<21, "$f21">;
def F22 : FPR<22, "$f22">;  def F23 : FPR<23, "$f23">;
def F24 : FPR<24, "$f24">;  def F25 : FPR<25, "$f25">;
def F26 : FPR<26, "$f26">;  def F27 : FPR<27, "$f27">;
def F28 : FPR<28, "$f28">;  def F29 : FPR<29, "$f29">;
def F30 : FPR<30, "$f30">;  def F31 : FPR<31, "$f31">;

  // //#define FP    $15
  // //#define RA    $26
  // //#define PV    $27
  // //#define GP    $29
  // //#define SP    $30
  // $28 is undefined after any and all calls

/// Register classes
// Don't allocate 15, 28, 30, 31
def GPRC : RegisterClass<"Alpha", i64, 64,
     // Volatile
     [R0, R1, R2, R3, R4, R5, R6, R7, R8, R16, R17, R18, R19, R20, R21, R22,
      R23, R24, R25, 
     //Special meaning, but volatile
     R27, //procedure address
     R26, //return address
     R29, //global offset table address
     // Non-volatile
     R9, R10, R11, R12, R13, R14 ]>;
     // Note: R28 is reserved for the assembler

// Don't allocate 15, 29, 30, 31
// Allocation volatiles only for now
def FPRC : RegisterClass<"Alpha", f64, 64, [F0, F1, 
        F10, F11, F12, F13, F14, F15, F16, F17, F18, F19,
        F20, F21, F22, F23, F24, F25, F26, F27, F28, F29, F30,
        // Saved:
        F2, F3, F4, F5, F6, F7, F8, F9
        ]>;
