[mips][mips64r6] Add bc[12](eq|ne)z

[dsanders]

Summary

Depends on D3691

[dsanders]

Refresh after a difficult rebase

[dsanders]

Move a couple definitions slightly to accomodate changes on trunk. Haven't
accounted for the sorting in rL209129 yet

[vmedic]

LGTM

lib/Target/Mips/Disassembler/MipsDisassembler.cpp

static DecodeStatus DecodeMSA128DRegisterClass(MCInst &Inst,
                                                uint64_t Address,
                                                const void *Decoder);
 
 static DecodeStatus DecodeMSACtrlRegisterClass(MCInst &Inst,
                                                unsigned RegNo,
                                                uint64_t Address,
                                                const void *Decoder);
 
+static DecodeStatus DecodeCOP2RegisterClass(MCInst &Inst,
+                                            unsigned RegNo,
+                                            uint64_t Address,
+                                            const void *Decoder);
+
 static DecodeStatus DecodeBranchTarget(MCInst &Inst,
                                        unsigned Offset,
                                        uint64_t Address,
                                        const void *Decoder);
 
 static DecodeStatus DecodeJumpTarget(MCInst &Inst,
                                      unsigned Insn,
                                      uint64_t Address,
static DecodeStatus DecodeMSACtrlRegisterClass(MCInst &Inst,
   if (RegNo > 7)
     return MCDisassembler::Fail;
 
   unsigned Reg = getReg(Decoder, Mips::MSACtrlRegClassID, RegNo);
   Inst.addOperand(MCOperand::CreateReg(Reg));
   return MCDisassembler::Success;
 }
 
+static DecodeStatus DecodeCOP2RegisterClass(MCInst &Inst,
+                                            unsigned RegNo,
+                                            uint64_t Address,
+                                            const void *Decoder) {
+  if (RegNo > 31)
+    return MCDisassembler::Fail;
+
+  unsigned Reg = getReg(Decoder, Mips::COP2RegClassID, RegNo);
+  Inst.addOperand(MCOperand::CreateReg(Reg));
+  return MCDisassembler::Success;
+}
+
 static DecodeStatus DecodeBranchTarget(MCInst &Inst,
                                        unsigned Offset,
                                        uint64_t Address,
                                        const void *Decoder) {
   unsigned BranchOffset = Offset & 0xffff;
   BranchOffset = SignExtend32<18>(BranchOffset << 2) + 4;
   Inst.addOperand(MCOperand::CreateImm(BranchOffset));
   return MCDisassembler::Success;

lib/Target/Mips/Mips32r6InstrFormats.td

 
 //===----------------------------------------------------------------------===//
 //
 // Field Values
 //
 //===----------------------------------------------------------------------===//
 
 def OPGROUP_COP1    { bits<6> Value = 0b010001; }
+def OPGROUP_COP2    { bits<6> Value = 0b010010; }
 def OPGROUP_AUI     { bits<6> Value = 0b001111; }
 def OPGROUP_DAUI    { bits<6> Value = 0b011101; }
 def OPGROUP_PCREL   { bits<6> Value = 0b111011; }
 def OPGROUP_REGIMM  { bits<6> Value = 0b000001; }
 def OPGROUP_SPECIAL { bits<6> Value = 0b000000; }
 def OPGROUP_SPECIAL3 { bits<6> Value = 0b011111; }
 
 class OPCODE2<bits<2> Val> {
   bits<2> Value = Val;
 }
 def OPCODE2_ADDIUPC : OPCODE2<0b00>;
 def OPCODE2_LWPC    : OPCODE2<0b01>;
 def OPCODE2_LWUPC   : OPCODE2<0b10>;
 
 class OPCODE5<bits<5> Val> {
   bits<5> Value = Val;
 }
 def OPCODE5_ALUIPC : OPCODE5<0b11111>;
 def OPCODE5_AUIPC  : OPCODE5<0b11110>;
 def OPCODE5_DAHI : OPCODE5<0b00110>;
 def OPCODE5_DATI : OPCODE5<0b11110>;
+def OPCODE5_BC1EQZ : OPCODE5<0b01001>;
+def OPCODE5_BC1NEZ : OPCODE5<0b01101>;
+def OPCODE5_BC2EQZ : OPCODE5<0b01001>;
+def OPCODE5_BC2NEZ : OPCODE5<0b01101>;
 
 class OPCODE6<bits<6> Val> {
   bits<6> Value = Val;
 }
 def OPCODE6_ALIGN    : OPCODE6<0b100000>;
 def OPCODE6_DALIGN   : OPCODE6<0b100100>;
 def OPCODE6_BITSWAP  : OPCODE6<0b100000>;
 def OPCODE6_DBITSWAP : OPCODE6<0b100100>;
class COP1_3R_FM<bits<6> funct, FIELD_FMT Format> : MipsR6Inst {
   let Inst{31-26} = OPGROUP_COP1.Value;
   let Inst{25-21} = Format.Value;
   let Inst{20-16} = ft;
   let Inst{15-11} = fs;
   let Inst{10-6} = fd;
   let Inst{5-0} = funct;
 }
 
+class COP1_BCCZ_FM<OPCODE5 Operation> : MipsR6Inst {
+  bits<5> ft;
+  bits<16> offset;
+
+  bits<32> Inst;
+
+  let Inst{31-26} = OPGROUP_COP1.Value;
+  let Inst{25-21} = Operation.Value;
+  let Inst{20-16} = ft;
+  let Inst{15-0} = offset;
+}
+
+class COP2_BCCZ_FM<OPCODE5 Operation> : MipsR6Inst {
+  bits<5> ct;
+  bits<16> offset;
+
+  bits<32> Inst;
+
+  let Inst{31-26} = OPGROUP_COP2.Value;
+  let Inst{25-21} = Operation.Value;
+  let Inst{20-16} = ct;
+  let Inst{15-0} = offset;
+}
+
 class PCREL16_FM<OPCODE5 Operation> : MipsR6Inst {
   bits<5> rs;
   bits<16> imm;
 
   bits<32> Inst;
 
   let Inst{31-26} = OPGROUP_PCREL.Value;
   let Inst{25-21} = rs;

lib/Target/Mips/Mips32r6InstrInfo.td

 class BLEZC_ENC : CMP_BRANCH_RT_OFF16_FM<0b010110>;
 class BLTZALC_ENC : CMP_BRANCH_OFF16_FM<0b000111>;
 class BGTZC_ENC : CMP_BRANCH_RT_OFF16_FM<0b010111>;
 
 class BEQZC_ENC : CMP_BRANCH_OFF21_FM<0b110110>;
 class BGEZALC_ENC : CMP_BRANCH_OFF16_FM<0b000110>;
 class BNEZC_ENC : CMP_BRANCH_OFF21_FM<0b111110>;
 
+class BC1EQZ_ENC : COP1_BCCZ_FM<OPCODE5_BC1EQZ>;
+class BC1NEZ_ENC : COP1_BCCZ_FM<OPCODE5_BC1NEZ>;
+class BC2EQZ_ENC : COP2_BCCZ_FM<OPCODE5_BC2EQZ>;
+class BC2NEZ_ENC : COP2_BCCZ_FM<OPCODE5_BC2NEZ>;
+
 class JIALC_ENC : JMP_IDX_COMPACT_FM<0b111110>;
 class JIC_ENC   : JMP_IDX_COMPACT_FM<0b110110>;
 
 class BITSWAP_ENC : SPECIAL3_2R_FM<OPCODE6_BITSWAP>;
 class BLEZALC_ENC : CMP_BRANCH_RT_OFF16_FM<0b000110>;
 class DIV_ENC    : SPECIAL_3R_FM<0b00010, 0b011010>;
 class DIVU_ENC   : SPECIAL_3R_FM<0b00010, 0b011011>;
 class MOD_ENC    : SPECIAL_3R_FM<0b00011, 0b011010>;

 }
 
 class BLEZC_DESC : CMP_CBR_RT_Z_DESC_BASE<"blezc", brtarget, GPR32Opnd>;
 class BGTZC_DESC : CMP_CBR_RT_Z_DESC_BASE<"bgtzc", brtarget, GPR32Opnd>;
 
 class BEQZC_DESC : CMP_CBR_EQNE_Z_DESC_BASE<"beqzc", brtarget21, GPR32Opnd>;
 class BNEZC_DESC : CMP_CBR_EQNE_Z_DESC_BASE<"bnezc", brtarget21, GPR32Opnd>;
 
+class COP1_BCCZ_DESC_BASE<string instr_asm> : BRANCH_DESC_BASE {
+  dag InOperandList = (ins FGR64Opnd:$ft, brtarget:$offset);
+  dag OutOperandList = (outs);
+  string AsmString = instr_asm;
+  bit hasDelaySlot = 1;
+}
+
+class BC1EQZ_DESC : COP1_BCCZ_DESC_BASE<"bc1eqz $ft, $offset">;
+class BC1NEZ_DESC : COP1_BCCZ_DESC_BASE<"bc1nez $ft, $offset">;
+
+class COP2_BCCZ_DESC_BASE<string instr_asm> : BRANCH_DESC_BASE {
+  dag InOperandList = (ins COP2Opnd:$ct, brtarget:$offset);
+  dag OutOperandList = (outs);
+  string AsmString = instr_asm;
+  bit hasDelaySlot = 1;
+}
+
+class BC2EQZ_DESC : COP2_BCCZ_DESC_BASE<"bc2eqz $ct, $offset">;
+class BC2NEZ_DESC : COP2_BCCZ_DESC_BASE<"bc2nez $ct, $offset">;
+
 class JMP_IDX_COMPACT_DESC_BASE<string opstr, DAGOperand opnd,
                                 RegisterOperand GPROpnd> {
   dag InOperandList = (ins GPROpnd:$rt, opnd:$offset);
   string AsmString = !strconcat(opstr, "\t$rt, $offset");
   list<dag> Pattern = [];
   bit isTerminator = 1;
   bit hasDelaySlot = 0;
   string DecoderMethod = "DecodeSimm16";

 //===----------------------------------------------------------------------===//
 
 def ADDIUPC : ADDIUPC_ENC, ADDIUPC_DESC, ISA_MIPS32R6;
 def ALIGN : ALIGN_ENC, ALIGN_DESC, ISA_MIPS32R6;
 def ALUIPC : ALUIPC_ENC, ALUIPC_DESC, ISA_MIPS32R6;
 def AUI : AUI_ENC, AUI_DESC, ISA_MIPS32R6;
 def AUIPC : AUIPC_ENC, AUIPC_DESC, ISA_MIPS32R6;
 def BALC : BALC_ENC, BALC_DESC, ISA_MIPS32R6;
-def BC1EQZ;
-def BC1NEZ;
-def BC2EQZ;
-def BC2NEZ;
+def BC1EQZ : BC1EQZ_ENC, BC1EQZ_DESC, ISA_MIPS32R6;
+def BC1NEZ : BC1NEZ_ENC, BC1NEZ_DESC, ISA_MIPS32R6;
+def BC2EQZ : BC2EQZ_ENC, BC2EQZ_DESC, ISA_MIPS32R6;
+def BC2NEZ : BC2NEZ_ENC, BC2NEZ_DESC, ISA_MIPS32R6;
 def BC : BC_ENC, BC_DESC, ISA_MIPS32R6;
 def BEQC : BEQC_ENC, BEQC_DESC, ISA_MIPS32R6;
 def BEQZALC : BEQZALC_ENC, BEQZALC_DESC, ISA_MIPS32R6;
 def BEQZC : BEQZC_ENC, BEQZC_DESC, ISA_MIPS32R6;
 def BGEC;  // Also aliased to blec with operands swapped
 def BGEUC; // Also aliased to bleuc with operands swapped
 def BGEZALC : BGEZALC_ENC, BGEZALC_DESC, ISA_MIPS32R6;
 def BGEZC : BGEZC_ENC, BGEZC_DESC, ISA_MIPS32R6;

test/MC/Mips/mips32r6/valid.s

 # Instructions that are valid
 #
 # RUN: llvm-mc %s -triple=mips-unknown-linux -show-encoding -mcpu=mips32r6 | FileCheck %s
 
         .set noat
         # FIXME: Add the instructions carried forward from older ISA's
         addiupc $4, 100          # CHECK: addiupc $4, 100     # encoding: [0xec,0x80,0x00,0x19]
         align   $4, $2, $3, 2    # CHECK: align $4, $2, $3, 2 # encoding: [0x7c,0x43,0x22,0xa0]
         aluipc  $3, 56           # CHECK: aluipc $3, 56       # encoding: [0xec,0x7f,0x00,0x38]
         aui     $3,$2,-23        # CHECK: aui $3, $2, -23     # encoding: [0x3c,0x62,0xff,0xe9]
         auipc   $3, -1           # CHECK: auipc $3, -1        # encoding: [0xec,0x7e,0xff,0xff]
         balc 14572256            # CHECK: balc 14572256       # encoding: [0xe8,0x37,0x96,0xb8]
         bc 14572256              # CHECK: bc 14572256         # encoding: [0xc8,0x37,0x96,0xb8]
+        bc1eqz  $f0,4            # CHECK: bc1eqz $f0, 4       # encoding: [0x45,0x20,0x00,0x01]
+        bc1eqz  $f31,4           # CHECK: bc1eqz $f31, 4      # encoding: [0x45,0x3f,0x00,0x01]
+        bc1nez  $f0,4            # CHECK: bc1nez $f0, 4       # encoding: [0x45,0xa0,0x00,0x01]
+        bc1nez  $f31,4           # CHECK: bc1nez $f31, 4      # encoding: [0x45,0xbf,0x00,0x01]
+        bc2eqz  $0,8             # CHECK: bc2eqz $0, 8        # encoding: [0x49,0x20,0x00,0x02]
+        bc2eqz  $31,8            # CHECK: bc2eqz $31, 8       # encoding: [0x49,0x3f,0x00,0x02]
+        bc2nez  $0,8             # CHECK: bc2nez $0, 8        # encoding: [0x49,0xa0,0x00,0x02]
+        bc2nez  $31,8            # CHECK: bc2nez $31, 8       # encoding: [0x49,0xbf,0x00,0x02]
         beqc $5, $6, 256         # CHECK: beqc $5, $6, 256    # encoding: [0x20,0xa6,0x00,0x40]
         beqzalc $2, 1332         # CHECK: beqzalc $2, 1332    # encoding: [0x20,0x02,0x01,0x4d]
         bnec $5, $6, 256         # CHECK: bnec $5, $6, 256    # encoding: [0x60,0xa6,0x00,0x40]
         bnezalc $2, 1332         # CHECK: bnezalc $2, 1332    # encoding: [0x60,0x02,0x01,0x4d]
         beqzc $5, 72256          # CHECK: beqzc $5, 72256     # encoding: [0xd8,0xa0,0x46,0x90]
         bgezalc $2, 1332         # CHECK: bgezalc $2, 1332    # encoding: [0x18,0x42,0x01,0x4d]
         bnezc $5, 72256          # CHECK: bnezc $5, 72256     # encoding: [0xf8,0xa0,0x46,0x90]
         bltzc $5, 256            # CHECK: bltzc $5, 256       # encoding: [0x5c,0xa5,0x00,0x40]

test/MC/Mips/mips64r6/valid.s

 # Instructions that are valid
 #
 # RUN: llvm-mc %s -triple=mips-unknown-linux -show-encoding -mcpu=mips64r6 | FileCheck %s
 
         .set noat
         # FIXME: Add the instructions carried forward from older ISA's
         addiupc $4, 100          # CHECK: addiupc $4, 100     # encoding: [0xec,0x80,0x00,0x19]
         align   $4, $2, $3, 2    # CHECK: align $4, $2, $3, 2 # encoding: [0x7c,0x43,0x22,0xa0]
         aluipc  $3, 56           # CHECK: aluipc $3, 56       # encoding: [0xec,0x7f,0x00,0x38]
         aui     $3,$2,-23        # CHECK: aui $3, $2, -23     # encoding: [0x3c,0x62,0xff,0xe9]
         auipc   $3, -1           # CHECK: auipc $3, -1        # encoding: [0xec,0x7e,0xff,0xff]
         balc 14572256            # CHECK: balc 14572256       # encoding: [0xe8,0x37,0x96,0xb8]
         bc 14572256              # CHECK: bc 14572256         # encoding: [0xc8,0x37,0x96,0xb8]
+        bc1eqz  $f0,4            # CHECK: bc1eqz $f0, 4       # encoding: [0x45,0x20,0x00,0x01]
+        bc1eqz  $f31,4           # CHECK: bc1eqz $f31, 4      # encoding: [0x45,0x3f,0x00,0x01]
+        bc1nez  $f0,4            # CHECK: bc1nez $f0, 4       # encoding: [0x45,0xa0,0x00,0x01]
+        bc1nez  $f31,4           # CHECK: bc1nez $f31, 4      # encoding: [0x45,0xbf,0x00,0x01]
+        bc2eqz  $0,8             # CHECK: bc2eqz $0, 8        # encoding: [0x49,0x20,0x00,0x02]
+        bc2eqz  $31,8            # CHECK: bc2eqz $31, 8       # encoding: [0x49,0x3f,0x00,0x02]
+        bc2nez  $0,8             # CHECK: bc2nez $0, 8        # encoding: [0x49,0xa0,0x00,0x02]
+        bc2nez  $31,8            # CHECK: bc2nez $31, 8       # encoding: [0x49,0xbf,0x00,0x02]
         beqc $5, $6, 256         # CHECK: beqc $5, $6, 256    # encoding: [0x20,0xa6,0x00,0x40]
         beqzalc $2, 1332         # CHECK: beqzalc $2, 1332    # encoding: [0x20,0x02,0x01,0x4d]
         bnec $5, $6, 256         # CHECK: bnec $5, $6, 256    # encoding: [0x60,0xa6,0x00,0x40]
         bnezalc $2, 1332         # CHECK: bnezalc $2, 1332    # encoding: [0x60,0x02,0x01,0x4d]
         beqzc $5, 72256          # CHECK: beqzc $5, 72256     # encoding: [0xd8,0xa0,0x46,0x90]
         bgezalc $2, 1332         # CHECK: bgezalc $2, 1332    # encoding: [0x18,0x42,0x01,0x4d]
         bnezc $5, 72256          # CHECK: bnezc $5, 72256     # encoding: [0xf8,0xa0,0x46,0x90]
         bltzc $5, 256            # CHECK: bltzc $5, 256       # encoding: [0x5c,0xa5,0x00,0x40]