Add definitions of 64-bit register files. Add code for returning Mips64's sets of

callee-saved registers and reserved registers.

llvm-svn: 140395

lib/Target/Mips/MipsRegisterInfo.cpp

@@ -112,24 +112,71 @@ getCalleeSavedRegs(const MachineFunction *MF) const
     Mips::S3, Mips::S2, Mips::S1, Mips::S0, 0
   };
 
+  static const unsigned N32CalleeSavedRegs[] = {
+    Mips::D31_64, Mips::D29_64, Mips::D27_64, Mips::D25_64, Mips::D23_64,
+    Mips::D21_64,
+    Mips::RA_64, Mips::FP_64, Mips::GP_64, Mips::S7_64, Mips::S6_64,
+    Mips::S5_64, Mips::S4_64, Mips::S3_64, Mips::S2_64, Mips::S1_64,
+    Mips::S0_64, 0
+  };
+
+  static const unsigned N64CalleeSavedRegs[] = {
+    Mips::D31_64, Mips::D30_64, Mips::D29_64, Mips::D28_64, Mips::D27_64,
+    Mips::D26_64, Mips::D25_64, Mips::D24_64,
+    Mips::RA_64, Mips::FP_64, Mips::GP_64, Mips::S7_64, Mips::S6_64,
+    Mips::S5_64, Mips::S4_64, Mips::S3_64, Mips::S2_64, Mips::S1_64,
+    Mips::S0_64, 0
+  };
+
   if (Subtarget.isSingleFloat())
     return SingleFloatOnlyCalleeSavedRegs;
-  else
+  else if (!Subtarget.hasMips64())
     return Mips32CalleeSavedRegs;
+  else if (Subtarget.isABI_N32())
+    return N32CalleeSavedRegs;
+  
+  assert(Subtarget.isABI_N64());
+  return N64CalleeSavedRegs;  
 }
 
 BitVector MipsRegisterInfo::
 getReservedRegs(const MachineFunction &MF) const {
-  BitVector Reserved(getNumRegs());
-  Reserved.set(Mips::ZERO);
-  Reserved.set(Mips::AT);
-  Reserved.set(Mips::K0);
-  Reserved.set(Mips::K1);
-  Reserved.set(Mips::GP);
-  Reserved.set(Mips::SP);
-  Reserved.set(Mips::FP);
-  Reserved.set(Mips::RA);
+  static const unsigned ReservedCPURegs[] = {
+    Mips::ZERO, Mips::AT, Mips::K0, Mips::K1, 
+    Mips::GP, Mips::SP, Mips::FP, Mips::RA, 0
+  };
 
+  static const unsigned ReservedCPU64Regs[] = {
+    Mips::ZERO_64, Mips::AT_64, Mips::K0_64, Mips::K1_64, 
+    Mips::GP_64, Mips::SP_64, Mips::FP_64, Mips::RA_64, 0
+  };
+
+  BitVector Reserved(getNumRegs());
+  typedef TargetRegisterClass::iterator RegIter;
+
+  for (const unsigned *Reg = ReservedCPURegs; *Reg; ++Reg)
+    Reserved.set(*Reg);
+
+  if (Subtarget.hasMips64()) {
+    for (const unsigned *Reg = ReservedCPU64Regs; *Reg; ++Reg)
+      Reserved.set(*Reg);
+
+    // Reserve all registers in AFGR64.
+    for (RegIter Reg = Mips::AFGR64RegisterClass->begin();
+         Reg != Mips::AFGR64RegisterClass->end(); ++Reg)
+      Reserved.set(*Reg);
+  }
+  else {
+    // Reserve all registers in CPU64Regs & FGR64.
+    for (RegIter Reg = Mips::CPU64RegsRegisterClass->begin();
+         Reg != Mips::CPU64RegsRegisterClass->end(); ++Reg)
+      Reserved.set(*Reg);
+
+    for (RegIter Reg = Mips::FGR64RegisterClass->begin();
+         Reg != Mips::FGR64RegisterClass->end(); ++Reg)
+      Reserved.set(*Reg);
+  }
+  
   return Reserved;
 }
 

lib/Target/Mips/MipsRegisterInfo.td

@@ -68,6 +68,7 @@ class HWR<bits<5> num, string n> : MipsReg<n> {
 //===----------------------------------------------------------------------===//
 
 let Namespace = "Mips" in {
+  // FIXME: Fix DwarfRegNum.
 
   // General Purpose Registers
   def ZERO : MipsGPRReg< 0, "ZERO">, DwarfRegNum<[0]>;
@@ -228,6 +229,11 @@ let Namespace = "Mips" in {
   def HI  : Register<"hi">, DwarfRegNum<[64]>;
   def LO  : Register<"lo">, DwarfRegNum<[65]>;
 
+  let SubRegIndices = [sub_32] in {
+  def HI64  : RegisterWithSubRegs<"hi", [HI]>;
+  def LO64  : RegisterWithSubRegs<"lo", [LO]>;
+  }
+
   // Status flags register
   def FCR31 : Register<"31">;
 
@@ -249,6 +255,18 @@ def CPURegs : RegisterClass<"Mips", [i32], 32, (add
   // Reserved
   ZERO, AT, K0, K1, GP, SP, FP, RA)>;
 
+def CPU64Regs : RegisterClass<"Mips", [i64], 64, (add
+  // Return Values and Arguments
+  V0_64, V1_64, A0_64, A1_64, A2_64, A3_64,
+  // Not preserved across procedure calls
+  T0_64, T1_64, T2_64, T3_64, T4_64, T5_64, T6_64, T7_64, T8_64, T9_64,
+  // Callee save
+  S0_64, S1_64, S2_64, S3_64, S4_64, S5_64, S6_64, S7_64,
+  // Reserved
+  ZERO_64, AT_64, K0_64, K1_64, GP_64, SP_64, FP_64, RA_64)> {
+  let SubRegClasses = [(CPURegs sub_32)];
+}
+
 // 64bit fp:
 // * FGR64  - 32 64-bit registers
 // * AFGR64 - 16 32-bit even registers (32-bit FP Mode)
@@ -268,11 +286,18 @@ def AFGR64 : RegisterClass<"Mips", [f64], 64, (add
   let SubRegClasses = [(FGR32 sub_fpeven, sub_fpodd)];
 }
 
+def FGR64 : RegisterClass<"Mips", [f64], 64, (sequence "D%u_64", 0, 31)> {
+  let SubRegClasses = [(FGR32 sub_32)];
+}
+
 // Condition Register for floating point operations
 def CCR  : RegisterClass<"Mips", [i32], 32, (add FCR31)>;
 
 // Hi/Lo Registers
 def HILO : RegisterClass<"Mips", [i32], 32, (add HI, LO)>;
+def HILO64 : RegisterClass<"Mips", [i64], 64, (add HI64, LO64)> {
+  let SubRegClasses = [(HILO sub_32)];
+}
 
 // Hardware registers
 def HWRegs : RegisterClass<"Mips", [i32], 32, (add HWR29)>;