This patch implements Mips load/store instructions from/to coprocessor 2. Test cases are added.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@190780 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/Mips/AsmParser/MipsAsmParser.cpp

@@ -125,6 +125,9 @@ class MipsAsmParser : public MCTargetAsmParser {
   MipsAsmParser::OperandMatchResultTy
   parseHI32DSP(SmallVectorImpl<MCParsedAsmOperand*> &Operands);
 
+  MipsAsmParser::OperandMatchResultTy
+  parseCOP2(SmallVectorImpl<MCParsedAsmOperand*> &Operands);
+
   bool searchSymbolAlias(SmallVectorImpl<MCParsedAsmOperand*> &Operands,
                          unsigned RegKind);
 
@@ -239,7 +242,8 @@ public:
     Kind_FCCRegs,
     Kind_ACC64DSP,
     Kind_LO32DSP,
-    Kind_HI32DSP
+    Kind_HI32DSP,
+    Kind_COP2
   };
 
 private:
@@ -457,6 +461,10 @@ public:
     return Kind == k_Register && Reg.Kind == Kind_HI32DSP;
   }
 
+  bool isCOP2Asm() const {
+    return Kind == k_Register && Reg.Kind == Kind_COP2;
+  }
+
   /// getStartLoc - Get the location of the first token of this operand.
   SMLoc getStartLoc() const {
     return StartLoc;
@@ -1585,6 +1593,32 @@ MipsAsmParser::parseHI32DSP(SmallVectorImpl<MCParsedAsmOperand*> &Operands) {
   return MatchOperand_Success;
 }
 
+MipsAsmParser::OperandMatchResultTy
+MipsAsmParser::parseCOP2(SmallVectorImpl<MCParsedAsmOperand*> &Operands) {
+  // If the first token is not '$' we have an error.
+  if (Parser.getTok().isNot(AsmToken::Dollar))
+    return MatchOperand_NoMatch;
+
+  SMLoc S = Parser.getTok().getLoc();
+  Parser.Lex(); // Eat the '$'
+
+  const AsmToken &Tok = Parser.getTok(); // Get next token.
+
+  if (Tok.isNot(AsmToken::Integer))
+    return MatchOperand_NoMatch;
+
+  unsigned IntVal = Tok.getIntVal();
+
+  unsigned Reg = matchRegisterByNumber(IntVal, Mips::COP2RegClassID);
+
+  MipsOperand *Op = MipsOperand::CreateReg(Reg, S, Parser.getTok().getLoc());
+  Op->setRegKind(MipsOperand::Kind_COP2);
+  Operands.push_back(Op);
+
+  Parser.Lex(); // Eat the register number.
+  return MatchOperand_Success;
+}
+
 bool MipsAsmParser::searchSymbolAlias(
     SmallVectorImpl<MCParsedAsmOperand*> &Operands, unsigned RegKind) {
 

lib/Target/Mips/MipsInstrFPU.td

@@ -372,6 +372,14 @@ let Predicates = [NotFP64bit, HasStdEnc] in {
   def SDC1 : SW_FT<"sdc1", AFGR64Opnd, IIFStore, store>, LW_FM<0x3d>;
 }
 
+/// Cop2 Memory Instructions
+let Predicates = [HasStdEnc] in {
+  def LWC2 : LW_FT<"lwc2", COP2Opnd, NoItinerary, load>, LW_FM<0x32>;
+  def SWC2 : SW_FT<"swc2", COP2Opnd, NoItinerary, store>, LW_FM<0x3a>;
+  def LDC2 : LW_FT<"ldc2", COP2Opnd, NoItinerary, load>, LW_FM<0x36>;
+  def SDC2 : SW_FT<"sdc2", COP2Opnd, NoItinerary, store>, LW_FM<0x3e>;
+}
+
 // Indexed loads and stores.
 let Predicates = [HasFPIdx, HasStdEnc] in {
   def LWXC1 : LWXC1_FT<"lwxc1", FGR32Opnd, IIFLoad, load>, LWXC1_FM<0>;

lib/Target/Mips/MipsRegisterInfo.td

@@ -201,6 +201,10 @@ let Namespace = "Mips" in {
   foreach I = 0-7 in
   def FCC#I : MipsReg<#I, "fcc"#I>;
 
+  // COP2 registers.
+  foreach I = 0-31 in
+  def COP2#I : MipsReg<#I, ""#I>;
+
   // PC register
   def PC : Register<"pc">;
 
@@ -368,6 +372,10 @@ def ACC64DSP : RegisterClass<"Mips", [untyped], 64, (sequence "AC%u", 0, 3)> {
 
 def DSPCC : RegisterClass<"Mips", [v4i8, v2i16], 32, (add DSPCCond)>;
 
+// Coprocessor 2 registers.
+def COP2 : RegisterClass<"Mips", [i32], 32, (sequence "COP2%u", 0, 31)>,
+           Unallocatable;
+
 // Register Operands.
 
 class MipsAsmRegOperand : AsmOperandClass {
@@ -449,6 +457,11 @@ def HWRegsAsmOperand : MipsAsmRegOperand {
   let ParserMethod = "parseHWRegs";
 }
 
+def COP2AsmOperand : MipsAsmRegOperand {
+  let Name = "COP2Asm";
+  let ParserMethod = "parseCOP2";
+}
+
 def HWRegsOpnd : RegisterOperand<HWRegs> {
   let ParserMatchClass = HWRegsAsmOperand;
 }
@@ -484,3 +497,7 @@ def HI32DSPOpnd : RegisterOperand<HI32DSP> {
 def ACC64DSPOpnd : RegisterOperand<ACC64DSP> {
   let ParserMatchClass = ACC64DSPAsmOperand;
 }
+
+def COP2Opnd : RegisterOperand<COP2> {
+  let ParserMatchClass = COP2AsmOperand;
+}

test/MC/Mips/mips-fpu-instructions.s

@@ -169,6 +169,10 @@
 # CHECK:  swxc1   $f26, $18($22)          # encoding: [0x08,0xd0,0xd2,0x4e]
 # CHECK:  mfhc1   $17, $f4                # encoding: [0x00,0x20,0x71,0x44]
 # CHECK:  mthc1   $17, $f6                # encoding: [0x00,0x30,0xf1,0x44]
+# CHECK:  swc2    $4, 16($sp)             # encoding: [0x10,0x00,0xa4,0xeb]
+# CHECK:  sdc2    $4, 16($sp)             # encoding: [0x10,0x00,0xa4,0xfb]
+# CHECK:  lwc2    $11, 12($ra)            # encoding: [0x0c,0x00,0xeb,0xcb]
+# CHECK:  ldc2    $11, 12($ra)            # encoding: [0x0c,0x00,0xeb,0xdb]
 
    cfc1    $a2,$0
    ctc1    $10,$31
@@ -200,3 +204,7 @@
    swxc1   $f26, $s2($s6)
    mfhc1   $17, $f4
    mthc1   $17, $f6
+   swc2    $4, 16($sp)
+   sdc2    $4, 16($sp)
+   lwc2    $11, 12($ra)
+   ldc2    $11, 12($ra)