//===- ARCInstrInfo.td - Target Description for ARC --------*- tablegen -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file describes the ARC instructions in TableGen format.
//
//===----------------------------------------------------------------------===//

include "ARCInstrFormats.td"

// ---------------------------------------------------------------------------
// Selection DAG Nodes.
// ---------------------------------------------------------------------------

// Selection DAG types.
def SDT_ARCcmptst : SDTypeProfile<0, 2, [SDTCisSameAs<0, 1>]>;
def SDT_ARCcmov : SDTypeProfile<1, 3, [SDTCisSameAs<0, 1>]>;
def SDT_ARCmov : SDTypeProfile<1, 1, [SDTCisSameAs<0, 1>]>;
def SDT_ARCbrcc : SDTypeProfile<0, 4, []>;
def SDT_ARCBranchLink : SDTypeProfile<0, 1, [SDTCisPtrTy<0>]>;
def SDT_ARCCallSeqStart : SDCallSeqStart<[ SDTCisVT<0, i32>,
                                           SDTCisVT<1, i32> ]>;
def SDT_ARCCallSeqEnd   : SDCallSeqEnd<[ SDTCisVT<0, i32>,
                                         SDTCisVT<1, i32> ]>;


// Global Address.
def ARCGAWrapper : SDNode<"ARCISD::GAWRAPPER", SDT_ARCmov, []>;

// Comparison
def ARCcmp : SDNode<"ARCISD::CMP", SDT_ARCcmptst, [SDNPOutGlue]>;

// Conditionanal mov
def ARCcmov : SDNode<"ARCISD::CMOV", SDT_ARCcmov, [SDNPInGlue]>;

// Conditional Branch
def ARCbrcc : SDNode<"ARCISD::BRcc", SDT_ARCbrcc,
                       [SDNPHasChain, SDNPInGlue, SDNPOutGlue]>;

// Direct Call
def ARCBranchLink     : SDNode<"ARCISD::BL",SDT_ARCBranchLink,
                            [SDNPHasChain, SDNPOptInGlue, SDNPOutGlue,
                             SDNPVariadic]>;

// Indirect Call
def ARCJumpLink       : SDNode<"ARCISD::JL",SDT_ARCBranchLink,
                                 [SDNPHasChain, SDNPOptInGlue, SDNPOutGlue,
                                  SDNPVariadic]>;
// Call return
def ret      : SDNode<"ARCISD::RET", SDTNone,
                      [SDNPHasChain, SDNPOptInGlue, SDNPVariadic]>;

// Call sequencing nodes.
// These are target-independent nodes, but have target-specific formats.
def callseq_start : SDNode<"ISD::CALLSEQ_START", SDT_ARCCallSeqStart,
                           [SDNPHasChain, SDNPOutGlue]>;
def callseq_end   : SDNode<"ISD::CALLSEQ_END",   SDT_ARCCallSeqEnd,
                           [SDNPHasChain, SDNPOptInGlue, SDNPOutGlue]>;

//===----------------------------------------------------------------------===//
// Instruction Pattern Stuff
//===----------------------------------------------------------------------===//

def imm32 : ImmLeaf<i32, [{
  return (Imm & 0xFFFFFFFF) == Imm;
}]>;

// Addressing modes
def FrameADDR_ri : ComplexPattern<i32, 2, "SelectFrameADDR_ri",
                                  [add, frameindex], []>;
def AddrModeS9 : ComplexPattern<i32, 2, "SelectAddrModeS9", []>;
def AddrModeImm : ComplexPattern<i32, 2, "SelectAddrModeImm", []>;
def AddrModeFar : ComplexPattern<i32, 2, "SelectAddrModeFar", []>;

//===----------------------------------------------------------------------===//
// Instruction Class Templates
//===----------------------------------------------------------------------===//

//===----------------------------------------------------------------------===//
// Pseudo Instructions
//===----------------------------------------------------------------------===//

let Defs = [SP], Uses = [SP] in {
def ADJCALLSTACKDOWN : PseudoInstARC<(outs), (ins i32imm:$amt, i32imm:$amt2),
                               "# ADJCALLSTACKDOWN $amt, $amt2",
                               [(callseq_start timm:$amt, timm:$amt2)]>;
def ADJCALLSTACKUP : PseudoInstARC<(outs), (ins i32imm:$amt1, i32imm:$amt2),
                            "# ADJCALLSTACKUP $amt1",
                            [(callseq_end timm:$amt1, timm:$amt2)]>;
}

def GETFI : PseudoInstARC<(outs GPR32:$dst), (ins MEMii:$addr),
                             "pldfi $dst, $addr",
                             [(set GPR32:$dst, FrameADDR_ri:$addr)]>;


def ST_FAR : PseudoInstARC<(outs), (ins GPR32:$dst, MEMrlimm:$addr),
                             "ST_FAR $dst, $addr",
                             [(store GPR32:$dst, AddrModeFar:$addr)]>;

def STH_FAR : PseudoInstARC<(outs), (ins GPR32:$dst, MEMrlimm:$addr),
                             "STH_FAR $dst, $addr",
                             [(truncstorei16 GPR32:$dst, AddrModeFar:$addr)]>;

def STB_FAR : PseudoInstARC<(outs), (ins GPR32:$dst, MEMrlimm:$addr),
                             "STB_FAR $dst, $addr",
                             [(truncstorei8 GPR32:$dst, AddrModeFar:$addr)]>;

//===----------------------------------------------------------------------===//
// Instruction Generation multiclasses.
// Generate many variants of a single instruction with a single defining
// multiclass.  These classes do not contain Selection DAG patterns.
//===----------------------------------------------------------------------===//

// Generic 3 operand binary instructions (i.e., add r0, r1, r2).
multiclass ArcBinaryInst<bits<5> major, bits<6> mincode,
                       string opasm> {
  // 3 register variant.
  def _rrr : F32_DOP_RR<major, mincode, 0, (outs GPR32:$A),
                        (ins GPR32:$B, GPR32:$C),
                        !strconcat(opasm, "\t$A, $B, $C"),
                        []>;

  // 2 register with unsigned 6-bit immediate variant.
  def _rru6 : F32_DOP_RU6<major, mincode, 0, (outs GPR32:$A),
                          (ins GPR32:$B, immU6:$U6),
                          !strconcat(opasm, "\t$A, $B, $U6"),
                          []>;
  // 2 register with 32-bit immediate variant.
  def _rrlimm : F32_DOP_RLIMM<major, mincode, 0,
                      (outs GPR32:$A),
                      (ins GPR32:$B, i32imm:$LImm),
                      !strconcat(opasm, "\t$A, $B, $LImm"),
                      []>;
  // 2 matched-register with signed 12-bit immediate variant (add r0, r0, -1).
  def _rrs12 : F32_DOP_RS12<major, mincode, 0,
                            (outs GPR32:$B),
                            (ins GPR32:$in, immS<12>:$S12),
                            !strconcat(opasm, "\t$B, $in, $S12"),
                            []>
  { let Constraints = "$B = $in"; }
}

// Special multivariant GEN4 DOP format instruction that take 2 registers.
// This is the class that is used for various comparison instructions.
multiclass ArcSpecialDOPInst<bits<6> subop, string opasm, bit F> {
  def _rr : F32_DOP_RR<0b00100, subop, F, (outs), (ins GPR32:$B, GPR32:$C),
               !strconcat(opasm, "\t$B, $C"),
               []>;

  def _ru6 : F32_DOP_RU6<0b00100, subop, F, (outs), (ins GPR32:$B, i32imm:$U6),
               !strconcat(opasm, "\t$B, $U6"),
               []>;

  def _rlimm : F32_DOP_RLIMM<0b00100, subop, F, (outs),
               (ins GPR32:$B, i32imm:$LImm),
               !strconcat(opasm, "\t$B, $LImm"),
               []>;
}

// Generic 2-operand unary instructions.
multiclass ArcUnaryInst<bits<5> major, bits<6> subop,
                        string opasm> {
  def _rr : F32_SOP_RR<major, subop, 0, (outs GPR32:$B), (ins GPR32:$C),
                       !strconcat(opasm, "\t$B, $C"), []>;
}


multiclass ArcBinaryGEN4Inst<bits<6> mincode, string opasm> :
  ArcBinaryInst<0b00100, mincode, opasm>;
multiclass ArcBinaryEXT5Inst<bits<6> mincode, string opasm> :
  ArcBinaryInst<0b00101, mincode, opasm>;

multiclass ArcUnaryGEN4Inst<bits<6> mincode, string opasm> :
  ArcUnaryInst<0b00100, mincode, opasm>;

// Pattern generation for differnt instruction variants.
multiclass MultiPat<SDPatternOperator InFrag,
               Instruction RRR, Instruction RRU6, Instruction RRLImm> {
  def _rrr : Pat<(InFrag i32:$B, i32:$C), (RRR i32:$B, i32:$C)>;
  def _rru6 : Pat<(InFrag i32:$B, immU6:$U6), (RRU6 i32:$B, immU6:$U6)>;
  def _rrlimm : Pat<(InFrag i32:$B, imm32:$LImm), (RRLImm i32:$B, imm32:$LImm)>;
}

// ---------------------------------------------------------------------------
// Instruction defintions and patterns for 3 operand binary instructions.
// ---------------------------------------------------------------------------

// Definitions for 3 operand binary instructions.
defm ADD : ArcBinaryGEN4Inst<0b000000, "add">;
defm SUB : ArcBinaryGEN4Inst<0b000010, "sub">;
defm SUB1 : ArcBinaryGEN4Inst<0b010111, "sub1">;
defm SUB2 : ArcBinaryGEN4Inst<0b011000, "sub2">;
defm SUB3 : ArcBinaryGEN4Inst<0b011001, "sub3">;
defm OR  : ArcBinaryGEN4Inst<0b000101, "or">;
defm AND : ArcBinaryGEN4Inst<0b000100, "and">;
defm XOR : ArcBinaryGEN4Inst<0b000111, "xor">;
defm MAX : ArcBinaryGEN4Inst<0b001000, "max">;
defm MIN : ArcBinaryGEN4Inst<0b001001, "min">;
defm ASL : ArcBinaryEXT5Inst<0b000000, "asl">;
defm LSR : ArcBinaryEXT5Inst<0b000001, "lsr">;
defm ASR : ArcBinaryEXT5Inst<0b000010, "asr">;
defm ROR : ArcBinaryEXT5Inst<0b000011, "ror">;
defm MPY  : ArcBinaryGEN4Inst<0b011010, "mpy">;
defm MPYM : ArcBinaryGEN4Inst<0b011011, "mpym">;
defm MPYMU : ArcBinaryGEN4Inst<0b011100, "mpymu">;
defm SETEQ : ArcBinaryGEN4Inst<0b111000, "seteq">;

// Patterns for 3 operand binary instructions.
defm : MultiPat<add, ADD_rrr, ADD_rru6, ADD_rrlimm>;
defm : MultiPat<sub, SUB_rrr, SUB_rru6, SUB_rrlimm>;
defm : MultiPat<or, OR_rrr, OR_rru6, OR_rrlimm>;
defm : MultiPat<and, AND_rrr, AND_rru6, AND_rrlimm>;
defm : MultiPat<xor, XOR_rrr, XOR_rru6, XOR_rrlimm>;
defm : MultiPat<smax, MAX_rrr, MAX_rru6, MAX_rrlimm>;
defm : MultiPat<smin, MIN_rrr, MIN_rru6, MIN_rrlimm>;
defm : MultiPat<shl, ASL_rrr, ASL_rru6, ASL_rrlimm>;
defm : MultiPat<srl, LSR_rrr, LSR_rru6, LSR_rrlimm>;
defm : MultiPat<sra, ASR_rrr, ASR_rru6, ASR_rrlimm>;
defm : MultiPat<rotr, ROR_rrr, ROR_rru6, ROR_rrlimm>;
defm : MultiPat<mul, MPY_rrr, MPY_rru6, MPY_rrlimm>;
defm : MultiPat<mulhs, MPYM_rrr, MPYM_rru6, MPYM_rrlimm>;
defm : MultiPat<mulhu, MPYMU_rrr, MPYMU_rru6, MPYMU_rrlimm>;

// ---------------------------------------------------------------------------
// Unary Instruction definitions.
// ---------------------------------------------------------------------------
// General unary instruction definitions.
defm SEXB : ArcUnaryGEN4Inst<0b000101, "sexb">;
defm SEXH : ArcUnaryGEN4Inst<0b000110, "sexh">;

// General Unary Instruction fragments.
def : Pat<(sext_inreg i32:$a, i8), (SEXB_rr i32:$a)>;
def : Pat<(sext_inreg i32:$a, i16), (SEXH_rr i32:$a)>;

// Comparison instruction definition
let isCompare = 1, Defs = [STATUS32] in {
defm CMP : ArcSpecialDOPInst<0b001100, "cmp", 1>;
}

def cmp : PatFrag<(ops node:$op1, node:$op2), (ARCcmp $op1, $op2)>;
defm : MultiPat<cmp, CMP_rr, CMP_ru6, CMP_rlimm>;

// ---------------------------------------------------------------------------
// MOV instruction and variants (conditional mov).
// ---------------------------------------------------------------------------
let isReMaterializable = 1, isAsCheapAsAMove = 1, isMoveImm = 1 in {
def MOV_rs12 : F32_DOP_RS12<0b00100, 0b001010, 0,
                 (outs GPR32:$B), (ins immS<12>:$S12),
                 "mov\t$B, $S12",
                 [(set GPR32:$B, immS<12>:$S12)]>;
}

def MOV_rr : F32_DOP_RR<0b00100, 0b001010, 0,
                (outs GPR32:$B), (ins GPR32:$C),
                "mov\t$B, $C", []>;

def MOV_rlimm : F32_DOP_RLIMM<0b00100, 0b001010, 0,
                      (outs GPR32:$B), (ins i32imm:$LImm),
                      "mov\t$B, $LImm", []>;

def MOV_ru6 : F32_DOP_RU6<0b00100, 0b001010, 0,
                          (outs GPR32:$B), (ins immU6:$U6),
                          "mov\t$B, $U6", []>;

def cmov : PatFrag<(ops node:$op1, node:$op2, node:$cc),
                   (ARCcmov $op1, $op2, $cc)>;
let Uses = [STATUS32] in {
def MOVcc : F32_DOP_CC_RR<0b00100, 0b001010, 0,
               (outs GPR32:$B),
               (ins GPR32:$C, GPR32:$fval, cmovpred:$cc),
               !strconcat("mov.", "$cc\t$B, $C"),
               [(set GPR32:$B, (cmov i32:$C, i32:$fval, cmovpred:$cc))]> {
  let Constraints = "$B = $fval";
}
}
def : Pat<(ARCGAWrapper tglobaladdr:$addr),
           (MOV_rlimm tglobaladdr:$addr)>;

def : Pat<(ARCGAWrapper tjumptable:$addr),
           (MOV_rlimm tjumptable:$addr)>;


// ---------------------------------------------------------------------------
// Control flow instructions (branch, return, calls, etc).
// ---------------------------------------------------------------------------

// Branch instructions
let isBranch = 1, isTerminator = 1 in {

  // Unconditional branch.
  let isBarrier = 1 in
  def BR : F32_BR0_UCOND_FAR<(outs), (ins btargetS25:$S25),
                             "b\t$S25", [(br bb:$S25)]>;

  let Uses=[STATUS32] in
  // Conditional branch.
  def Bcc : F32_BR0_COND<(outs), (ins btargetS21:$S21, ccond:$cc),
                         "b$cc\t$S21", []>;

  // Compare and branch (limited range).
  def BRcc_rr  : F32_BR1_BCC<(outs),
                             (ins btargetS9:$S9, GPR32:$B, GPR32:$C, brccond:$cc),
                             "br$cc\t$B, $C, $S9", 0, []>;
  def BRcc_ru6 : F32_BR1_BCC<(outs),
                             (ins btargetS9:$S9, GPR32:$B, immU6:$C, brccond:$cc),
                             "br$cc\t$B, $C, $S9", 1, []>;

  // Pseudo compare and branch.
  // After register allocation, this can expand into either a limited range
  // Compare and branch (BRcc), or into CMP + Bcc.
  // At worst, this expands into 2 4-byte instructions.
  def BRcc_rr_p : PseudoInstARC<(outs),
                                (ins btarget:$T, GPR32:$B, GPR32:$C, ccond:$cc),
                                "pbr$cc\t$B, $C, $T", 
                                [(ARCbrcc bb:$T, i32:$B, i32:$C, imm32:$cc)]>
                                { let Size = 8; }

  def BRcc_ru6_p : PseudoInstARC<(outs),
                                 (ins btarget:$T, GPR32:$B, i32imm:$C, ccond:$cc),
                                 "pbr$cc\t$B, $C, $T",
                                 [(ARCbrcc bb:$T, i32:$B, immU6:$C, imm32:$cc)]>
                                 { let Size = 8; }
} // let isBranch, isTerminator

// Indirect, unconditional Jump.
let isBranch = 1, isTerminator = 1, isBarrier = 1, isIndirectBranch = 1 in
def J :  F32_DOP_RR<0b00100, 0b100000, 0,
               (outs), (ins GPR32:$C),
               "j\t[$C]", [(brind i32:$C)]>;

// Call instructions.
let isCall = 1, isBarrier = 1, Defs = [BLINK], Uses = [SP] in {
  // Direct unconditional call.
  def BL : F32_BR1_BL_UCOND_FAR<(outs), (ins calltargetS25:$S25),
                      "bl\t$S25", [(ARCBranchLink tglobaladdr:$S25)]>;

  // Indirect unconditional call.
  let isIndirectBranch = 1 in
  def JL : F32_DOP_RR<0b00100, 0b100010, 0, (outs), (ins GPR32:$C),
                     "jl\t[$C]", [(ARCJumpLink i32:$C)]>;
} // let isCall, isBarrier, Defs, Uses

// Pattern to generate BL instruction.
def : Pat<(ARCBranchLink texternalsym:$dst), (BL texternalsym:$dst)>;

// Return from call.
let isReturn = 1, isTerminator = 1, isBarrier = 1  in
// This is a specialized 2-byte instruction that doesn't generalize
// to any larger 2-byte class, so go ahead and define it here.
def J_S_BLINK : InstARC<2, (outs), (ins), "j_s\t[%blink]", [(ret)]> {
  let Inst{15-0} = 0b0111111011100000;
}

//----------------------------------------------------------------------------
// Compact stack-based operations.
//----------------------------------------------------------------------------

// 2-byte push/pop blink instructions commonly used for prolog/epilog
// generation.  These 2 instructions are actually specialized 2-byte
// format instructions that aren't generalized to a larger 2-byte
// class, so we might as well have them here.
let Uses = [BLINK], Defs = [SP] in
def PUSH_S_BLINK : F16_SP_OPS_buconst<0b111, "push_s">;

let Defs = [BLINK, SP] in
def POP_S_BLINK : F16_SP_OPS_buconst<0b110, "pop_s">;

def PUSH_S_r : F16_SP_OPS_uconst<0b110,
  (outs), (ins GPR32Reduced:$b3), "push_s">;
def POP_S_r : F16_SP_OPS_uconst<0b111,
  (outs GPR32Reduced:$b3), (ins), "pop_s">;

def SP_SUB_SP_S : F16_SP_OPS_bconst<0b001, "sub_s">;
def SP_ADD_SP_S : F16_SP_OPS_bconst<0b000, "add_s">;
def SP_ADD_S : F16_SP_OPS_u7_aligned<0b100,
                (outs GPR32Reduced:$b3), (ins immU<7>:$u7),
                "add_s\t$b3, %sp, $u7">;

def SP_LD_S : F16_SP_LD<0b000, "ld_s">;
def SP_LDB_S : F16_SP_LD<0b001, "ldb_s">;
def SP_ST_S : F16_SP_ST<0b010, "st_s">;
def SP_STB_S : F16_SP_ST<0b011, "stb_s">;

def LEAVE_S : F16_SP_OPS<0b110,
  (outs), (ins immU<7>:$u7), "leave_s\t$u7"> {

  bits<7> u7;
  
  let fieldB = u7{6-4};
  let fieldU{4-1} = u7{3-0};
  let fieldU{0} = 0b0;
}

def ENTER_S : F16_SP_OPS<0b111,
  (outs), (ins immU<6>:$u6), "enter_s\t$u6"> {

  bits<6> u6;
  
  let fieldB{2} = 0;
  let fieldB{1-0} = u6{5-4};
  let fieldU{4-1} = u6{3-0};
  let fieldU{0} = 0b0;
}

//----------------------------------------------------------------------------
// Compact Move/Load instructions.
//----------------------------------------------------------------------------
class COMPACT_MOV_S :
  F16_COMPACT<0b0, (outs GPR32:$g), (ins GPR32:$h),
          "mov_s\t$g, $h"> {  
  let DecoderMethod = "DecodeMoveHRegInstruction";
}

def COMPACT_MOV_S_limm : COMPACT_MOV_S {
  bits<32> LImm;  
  let Inst{47-16} = LImm;

  bits<5> LImmReg = 0b11110;  
  let Inst{7-5} = LImmReg{2-0};
  let Inst{1-0} = LImmReg{4-3};

  let Size = 6;  
}

def COMPACT_MOV_S_hreg : COMPACT_MOV_S;

def COMPACT_LD_S :
  F16_COMPACT<0b1, (outs GPR32:$r), (ins GPR32:$h, immU<5>:$u5),
          "ld_s\t$r, [$h, $u5]"> {
  bits<5> u5;
  bits<2> r;

  let Inst{10} = u5{4};
  let Inst{9-8} = r;
  let Inst{4-3} = u5{3-2};
  let u5{1-0} = 0b00;
}

//----------------------------------------------------------------------------
// Compact Load/Add/Sub.
//----------------------------------------------------------------------------
def LD_S_AS_rrr : F16_LD_SUB<0b0, "ld_s.as\t$a, [$b, $c]">;
def SUB_S_rrr : F16_LD_SUB<0b1, "sub_s\t$a, $b, $c">;
def ADD_S_rru6 : F16_ADD;

//----------------------------------------------------------------------------
// Compact Load/Store.
//----------------------------------------------------------------------------
def LD_S_s11 : F16_LD_ST_s11<0b0, "ld_s\t%r1, [%gp, $s11]">;
def ST_S_s11 : F16_LD_ST_s11<0b1, "st_s\t%r0, [%gp, $s11]">;
def LDI_S_u7 : F16_LDI_u7;

//----------------------------------------------------------------------------
// Indexed Jump or Execute.
//----------------------------------------------------------------------------
def JLI_S : F16_JLI_EI<0, "jli_s">;
def EI_S : F16_JLI_EI<1, "ei_s">;

//----------------------------------------------------------------------------
// Load/Add Register-Register.
//----------------------------------------------------------------------------
def LD_S_rrr : F16_LD_ADD_RR<0b00, "ld_s\t$a, [$b, $c]">;
def LDB_S_rrr : F16_LD_ADD_RR<0b01, "ldb_s\t$a, [$b, $c]">;
def LDH_S_rrr : F16_LD_ADD_RR<0b10, "ldh_s\t$a, [$b, $c]">;
def ADD_S_rrr : F16_LD_ADD_RR<0b11, "add_s\t$a, $b, $c">;

//----------------------------------------------------------------------------
// Load/Add GP-Relative.
//----------------------------------------------------------------------------
def GP_LD_S : F16_GP_LD_ADD<0b00, (ins immS<11>:$s),
  "ld_s\t%r0, [%gp, $s]"> {

  bits<11> s;
  let Inst{8-0} = s{10-2};
  let s{1-0} = 0b00;
}

def GP_LDB_S : F16_GP_LD_ADD<0b01, (ins immS<9>:$s),
  "ldb_s\t%r0, [%gp, $s]"> {

  bits<9> s;
  let Inst{8-0} = s{8-0};
}

def GP_LDH_S : F16_GP_LD_ADD<0b10, (ins immS<10>:$s),
  "ldh_s\t%r0, [%gp, $s]"> {

  bits<10> s;
  let Inst{8-0} = s{9-1};
  let s{0} = 0b0;
}

def GP_ADD_S : F16_GP_LD_ADD<0b11, (ins immS<11>:$s),
  "add_s\t%r0, %gp, $s"> {

  bits<11> s;
  let Inst{8-0} = s{10-2};
  let s{1-0} = 0b00;
}

//----------------------------------------------------------------------------
// Load PCL-Relative.
//----------------------------------------------------------------------------
def PCL_LD : InstARC<2, (outs GPR32:$b), (ins immU<10>:$u10),
 "ld_s\t$b, [%pcl, $u10]", []> {
 
  bits<3> b; 
  bits<10> u10; 

  let Inst{15-11} = 0b11010;
  let Inst{10-8} = b;
  let Inst{7-0} = u10{9-2};
  let u10{1-0} = 0b00;
}

let isBranch = 1 in {
  //----------------------------------------------------------------------------
  // Branch on Compare Register with Zero.
  //----------------------------------------------------------------------------
  def BREQ_S : F16_BCC_REG<0b0, "breq_s">;
  def BRNE_S : F16_BCC_REG<0b1, "brne_s">;

  //----------------------------------------------------------------------------
  // Branch Conditionally.
  //----------------------------------------------------------------------------
  let isBarrier = 1 in
  def B_S : F16_BCC_s10<0b00, "b_s">;

  def BEQ_S : F16_BCC_s10<0b01, "beq_s">;
  def BNE_S : F16_BCC_s10<0b10, "bne_s">;
  def BGT_S : F16_BCC_s7<0b000, "bgt_s">;
  def BGE_S : F16_BCC_s7<0b001, "bge_s">;
  def BLT_S : F16_BCC_s7<0b010, "blt_s">;
  def BLE_S : F16_BCC_s7<0b011, "ble_s">;
  def BHI_S : F16_BCC_s7<0b100, "bhi_s">;
  def BHS_S : F16_BCC_s7<0b101, "bhs_s">;
  def BLO_S : F16_BCC_s7<0b110, "blo_s">;
  def BLS_S : F16_BCC_s7<0b111, "bls_s">;
} // let isBranch

def BL_S :
  InstARC<2, (outs), (ins btargetS13:$s13), "bl_s\t$s13", []> {

  let Inst{15-11} = 0b11111;
  
  bits<13> s13;
  let Inst{10-0} = s13{12-2};
  let s13{1-0} = 0b00;
  
  let isCall = 1;
  let isBarrier = 1;
}

//----------------------------------------------------------------------------
// Add/Sub/Shift Register-Immediate.
//----------------------------------------------------------------------------
def ADD_S_ru3 : F16_ADD_IMM<0b00,"add_s">;
def SUB_S_ru3 : F16_ADD_IMM<0b01,"sub_s">;
def ASL_S_ru3 : F16_ADD_IMM<0b10,"asl_s">;
def ASR_S_ru3 : F16_ADD_IMM<0b11,"asr_s">;

//----------------------------------------------------------------------------
// Shift/Subtract/Bit Immediate.
//----------------------------------------------------------------------------
def ASL_S_ru5 : F16_SH_SUB_BIT_DST<0b000,"asl_s">;
def LSR_S_ru5 : F16_SH_SUB_BIT_DST<0b001,"lsr_s">;
def ASR_S_ru5 : F16_SH_SUB_BIT_DST<0b010,"asr_s">;
def SUB_S_ru5 : F16_SH_SUB_BIT_DST<0b011,"sub_s">;
def BSET_S_ru5 : F16_SH_SUB_BIT_DST<0b100,"bset_s">;
def BCLR_S_ru5 : F16_SH_SUB_BIT_DST<0b101,"bclr_s">;
def BMSK_S_ru5 : F16_SH_SUB_BIT_DST<0b110,"bmsk_s">;
def BTST_S_ru5 : F16_SH_SUB_BIT<0b111, "btst_s\t$b, $u5">;

//----------------------------------------------------------------------------
// Dual Register Operations.
//----------------------------------------------------------------------------
def ADD_S_rlimm :
  F16_OP_HREG_LIMM<0b000, (outs GPR32:$b_s3), (ins i32imm:$LImm),
          !strconcat("add_s", "\t$b_s3, $b_s3, $LImm")>;

def ADD_S_rr :
  F16_OP_HREG<0b000, (outs GPR32:$b_s3), (ins GPR32:$h),
          !strconcat("add_s", "\t$b_s3, $b_s3, $h")>;

def ADD_S_rs3 :
  F16_OP_HREG<0b001, (outs GPR32:$h), (ins immC<3>:$b_s3),
          !strconcat("add_s", "\t$h, $h, $b_s3")>;

def ADD_S_limms3 :
  F16_OP_HREG_LIMM<0b001, (outs), (ins immC<3>:$b_s3, i32imm:$LImm),
          !strconcat("add_s", "\t0, $LImm, $b_s3")>;

def MOV_S_NE_rlimm :
  F16_OP_HREG_LIMM<0b111, (outs GPR32:$b_s3), (ins i32imm:$LImm),
          !strconcat("mov_s.ne", "\t$b_s3, $LImm")>;

def MOV_S_NE_rr :
  F16_OP_HREG<0b111,(outs GPR32:$b_s3), (ins GPR32:$h),
          !strconcat("mov_s.ne", "\t$b_s3, $h")>;

def MOV_S_rs3 :
  F16_OP_HREG<0b011, (outs GPR32:$h), (ins immC<3>:$b_s3),
          !strconcat("mov_s", "\t$h, $b_s3")>;

def MOV_S_s3 :
  F16_OP_HREG30<0b011, (outs), (ins immC<3>:$b_s3),
          !strconcat("mov_s", "\t0, $b_s3")>;

def CMP_S_rlimm :
  F16_OP_HREG_LIMM<0b100, (outs GPR32:$b_s3), (ins i32imm:$LImm),
          !strconcat("cmp_s", "\t$b_s3, $LImm")>;

def CMP_S_rr :
  F16_OP_HREG<0b100, (outs GPR32:$b_s3), (ins GPR32:$h),
          !strconcat("cmp_s", "\t$b_s3, $h")>;

def CMP_S_rs3 :
  F16_OP_HREG<0b101, (outs GPR32:$h), (ins immC<3>:$b_s3),
          !strconcat("cmp_s", "\t$h, $b_s3")>;

def CMP_S_limms3 :
  F16_OP_HREG_LIMM<0b101, (outs), (ins immC<3>:$b_s3, i32imm:$LImm),
          !strconcat("cmp_s", "\t$LImm, $b_s3")>;

//----------------------------------------------------------------------------
// Compact MOV/ADD/CMP Immediate instructions.
//----------------------------------------------------------------------------
def MOV_S_u8 :
  F16_OP_IMM<0b11011, (outs GPR32:$b), (ins immU<8>:$u8),
          !strconcat("mov_s", "\t$b, $u8")> {
  bits<8> u8;
  let Inst{7-0} = u8;
}

def ADD_S_u7 :
  F16_OP_U7<0b0, !strconcat("add_s", "\t$b, $b, $u7")>;

def CMP_S_u7 :
  F16_OP_U7<0b1, !strconcat("cmp_s", "\t$b, $u7")>;

//----------------------------------------------------------------------------
// Compact Load/Store instructions with offset.
//----------------------------------------------------------------------------
def LD_S_OFF :
  F16_LD_ST_WORD_OFF<0x10, (outs GPR32:$c), (ins GPR32:$b, immU<7>:$off),
  "ld_s">;

def LDB_S_OFF :
  F16_LD_ST_BYTE_OFF<0x11, (outs GPR32:$c), (ins GPR32:$b, immU<5>:$off),
  "ldb_s">;

class F16_LDH_OFF<bits<5> opc, string asmstr> :
  F16_LD_ST_HALF_OFF<opc, (outs GPR32:$c), (ins GPR32:$b, immU<6>:$off),
  asmstr>;

def LDH_S_OFF : F16_LDH_OFF<0x12, "ldh_s">;
def LDH_S_X_OFF : F16_LDH_OFF<0x13, "ldh_s.x">;

def ST_S_OFF :
  F16_LD_ST_WORD_OFF<0x14, (outs), (ins GPR32:$c, GPR32:$b, immU<7>:$off),
  "st_s">;

def STB_S_OFF :
  F16_LD_ST_BYTE_OFF<0x15, (outs), (ins GPR32:$c, GPR32:$b, immU<5>:$off),
  "stb_s">;

def STH_S_OFF :
  F16_LD_ST_HALF_OFF<0x16, (outs), (ins GPR32:$c, GPR32:$b, immU<6>:$off),
  "sth_s">;

//----------------------------------------------------------------------------
// General compact instructions.
//----------------------------------------------------------------------------
def GEN_SUB_S : F16_GEN_DOP<0x02, "sub_s">;
def GEN_AND_S : F16_GEN_DOP<0x04, "and_s">;
def GEN_OR_S : F16_GEN_DOP<0x05, "or_s">;
def GEN_BIC_S : F16_GEN_DOP<0x06, "bic_s">;
def GEN_XOR_S : F16_GEN_DOP<0x07, "xor_s">;
def GEN_MPYW_S : F16_GEN_DOP<0x09, "mpyw_s">;
def GEN_MPYUW_S : F16_GEN_DOP<0x0a, "mpyuw_s">;
def GEN_TST_S : F16_GEN_DOP_NODST<0x0b, "tst_s">;
def GEN_MPY_S : F16_GEN_DOP<0x0c, "mpy_s">;
def GEN_SEXB_S : F16_GEN_DOP_SINGLESRC<0x0d, "sexb_s">;
def GEN_SEXH_S : F16_GEN_DOP_SINGLESRC<0x0e, "sexh_s">;
def GEN_EXTB_S : F16_GEN_DOP_SINGLESRC<0x0f, "extb_s">;
def GEN_EXTH_S : F16_GEN_DOP_SINGLESRC<0x10, "exth_s">;
def GEN_ABS_S : F16_GEN_DOP_SINGLESRC<0x11, "abs_s">;
def GEN_NOT_S : F16_GEN_DOP_SINGLESRC<0x12, "not_s">;
def GEN_NEG_S : F16_GEN_DOP_SINGLESRC<0x13, "neg_s">;
def GEN_ADD1_S : F16_GEN_DOP<0x14, "add1_s">;
def GEN_ADD2_S : F16_GEN_DOP<0x15, "add2_s">;
def GEN_ADD3_S : F16_GEN_DOP<0x16, "add3_s">;
def GEN_ASL_S : F16_GEN_DOP<0x18, "asl_s">;
def GEN_LSR_S : F16_GEN_DOP<0x19, "lsr_s">;
def GEN_ASR_S : F16_GEN_DOP<0x1a, "asr_s">;
def GEN_AS1L_S : F16_GEN_DOP_SINGLESRC<0x1b, "asl_s">;
def GEN_AS1R_S : F16_GEN_DOP_SINGLESRC<0x1c, "asr_s">;
def GEN_LS1R_S : F16_GEN_DOP_SINGLESRC<0x1d, "lsr_s">;
def GEN_TRAP_S : F16_GEN_DOP_BASE<0x1e, (outs), (ins immU6:$u6),
  "trap_s\t$u6"> {

  bits<6> u6;
  let b = u6{5-3};
  let c = u6{2-0};
}

def GEN_BRK_S : F16_GEN_DOP_BASE<0x1f, (outs), (ins),
  "brk_s"> {

  let b = 0b111;
  let c = 0b111;
}

let isBarrier = 1 in {
  let isBranch = 1 in {
    def GEN_J_S : F16_GEN_SOP<0x0, "j_s\t[$b]">;
    def GEN_J_S_D : F16_GEN_SOP<0x1, "j_s.d\t[$b]">;
  } // let isBranch

  let isCall = 1 in {
    def GEN_JL_S : F16_GEN_SOP<0x2, "jl_s\t[$b]">;
    def GEN_JL_S_D : F16_GEN_SOP<0x3, "jl_s.d\t[$b]">;
  } // let isCall
} // let isBarrier

def GEN_SUB_S_NE : F16_GEN_SOP<0x6, "sub_s.ne\t$b, $b, $b">;

def GEN_NOP_S : F16_GEN_ZOP<0x0, "nop_s">;
def GEN_UNIMP_S : F16_GEN_ZOP<0x1, "unimp_s">;
def GEN_SWI_S : F16_GEN_ZOP<0x2, "swi_s">;

let isReturn = 1, isTerminator = 1 in {
  def GEN_JEQ_S : F16_GEN_ZOP<0x4, "jeq_s\t[%blink]">;
  def GEN_JNE_S : F16_GEN_ZOP<0x5, "jne_s\t[%blink]">;
  let isBarrier = 1 in {
    //def GEN_J_S_BLINK : F16_GEN_ZOP<0x6, "j_s\t[%blink]">;
    def GEN_J_S_D_BLINK : F16_GEN_ZOP<0x7, "j_s.d\t[%blink]">;
  } // let isBarrier
} // let isReturn, isTerminator

//----------------------------------------------------------------------------
// Load/Store instructions.
//----------------------------------------------------------------------------

// Load instruction variants:
// Control bits: x, aa, di, zz
// x - sign extend.
// aa - incrementing mode. (N/A for LIMM).
// di - uncached.
// zz - data size.
multiclass ArcLdInst<bits<2> zz, string asmop> {
  let mayLoad = 1 in {
  def _rs9 : F32_LD_ADDR<0, 0b00, 0, zz,
                         (outs GPR32:$A), (ins MEMrs9:$addr),
                         !strconcat(asmop, "\t$A, [$addr]"), []>;

  def _limm : F32_LD_LIMM<0, 0, zz,
                         (outs GPR32:$A), (ins MEMii:$addr),
                         !strconcat(asmop, "\t$A, [$addr]"), []>;

  def _rlimm : F32_LD_RLIMM<0, 0b00, 0, zz,
                           (outs GPR32:$A), (ins MEMrlimm:$addr),
                           !strconcat(asmop, "\t$A, [$addr]"), []>;

  def _X_rs9 : F32_LD_ADDR<1, 0b00, 0, zz,
                         (outs GPR32:$A), (ins MEMrs9:$addr),
                         !strconcat(asmop, ".x\t$A, [$addr]"), []>;

  def _X_limm : F32_LD_LIMM<1, 0, zz,
                         (outs GPR32:$A), (ins MEMii:$addr),
                         !strconcat(asmop, ".x\t$A, [$addr]"), []>;

  def _X_rlimm : F32_LD_RLIMM<1, 0b00, 0, zz,
                           (outs GPR32:$A), (ins MEMrlimm:$addr),
                           !strconcat(asmop, ".x\t$A, [$addr]"), []>;

  def _AB_rs9 : F32_LD_RS9<0, 0b10, 0, zz,
                      (outs GPR32:$addrout, GPR32:$A),
                      (ins GPR32:$B, immS<9>:$S9),
                      !strconcat(asmop, ".ab\t$A, [$B,$S9]"), []>
    { let Constraints = "$addrout = $B"; }
  }
}
                         
// Load instruction definitions.
defm LD  : ArcLdInst<0b00, "ld">;
defm LDH : ArcLdInst<0b10, "ldh">;
defm LDB : ArcLdInst<0b01, "ldb">;

// Load instruction patterns.
// 32-bit loads.
def : Pat<(load AddrModeS9:$addr), (LD_rs9 AddrModeS9:$addr)>;
def : Pat<(load AddrModeImm:$addr), (LD_limm AddrModeImm:$addr)>;
def : Pat<(load AddrModeFar:$addr), (LD_rs9 AddrModeFar:$addr)>;

// 16-bit loads
def : Pat<(zextloadi16 AddrModeS9:$addr), (LDH_rs9 AddrModeS9:$addr)>;
def : Pat<(extloadi16 AddrModeS9:$addr), (LDH_rs9 AddrModeS9:$addr)>;
def : Pat<(zextloadi16 AddrModeImm:$addr), (LDH_limm AddrModeImm:$addr)>;
def : Pat<(extloadi16 AddrModeImm:$addr), (LDH_limm AddrModeImm:$addr)>;
def : Pat<(zextloadi16 AddrModeFar:$addr), (LDH_rlimm AddrModeFar:$addr)>;
def : Pat<(extloadi16 AddrModeFar:$addr), (LDH_rlimm AddrModeFar:$addr)>;
def : Pat<(sextloadi16 AddrModeImm:$addr),(LDH_X_limm AddrModeImm:$addr)>;
def : Pat<(sextloadi16 AddrModeFar:$addr),(LDH_X_rlimm AddrModeFar:$addr)>;
def : Pat<(sextloadi16 AddrModeS9:$addr),(LDH_X_rs9 AddrModeS9:$addr)>;

// 8-bit loads.
def : Pat<(zextloadi8 AddrModeS9:$addr), (LDB_rs9 AddrModeS9:$addr)>;
def : Pat<(extloadi8 AddrModeS9:$addr), (LDB_rs9 AddrModeS9:$addr)>;
def : Pat<(zextloadi8 AddrModeImm:$addr), (LDB_limm AddrModeImm:$addr)>;
def : Pat<(extloadi8 AddrModeImm:$addr), (LDB_limm AddrModeImm:$addr)>;
def : Pat<(zextloadi8 AddrModeFar:$addr), (LDB_rlimm AddrModeFar:$addr)>;
def : Pat<(extloadi8 AddrModeFar:$addr), (LDB_rlimm AddrModeFar:$addr)>;
def : Pat<(zextloadi1 AddrModeS9:$addr), (LDB_rs9 AddrModeS9:$addr)>;
def : Pat<(extloadi1 AddrModeS9:$addr), (LDB_rs9 AddrModeS9:$addr)>;
def : Pat<(zextloadi1 AddrModeImm:$addr), (LDB_limm AddrModeImm:$addr)>;
def : Pat<(extloadi1 AddrModeImm:$addr), (LDB_limm AddrModeImm:$addr)>;
def : Pat<(zextloadi1 AddrModeFar:$addr), (LDB_rlimm AddrModeFar:$addr)>;
def : Pat<(extloadi1 AddrModeFar:$addr), (LDB_rlimm AddrModeFar:$addr)>;
def : Pat<(sextloadi8 AddrModeImm:$addr),(LDB_X_limm AddrModeImm:$addr)>;
def : Pat<(sextloadi8 AddrModeFar:$addr),(LDB_X_rlimm AddrModeFar:$addr)>;
def : Pat<(sextloadi8 AddrModeS9:$addr),(LDB_X_rs9 AddrModeS9:$addr)>;


// Store instruction variants:
// Control bits: aa, di, zz
// aa - incrementing mode. (N/A for LIMM).
// di - uncached.
// zz - data size.
multiclass ArcStInst<bits<2> zz, string asmop> {
  let mayStore = 1 in {
  def _rs9  : F32_ST_ADDR<0b00, 0, zz, (outs), (ins GPR32:$C, MEMrs9:$addr),
                         !strconcat(asmop, "\t$C, [$addr]"), []>;

  def _limm : F32_ST_LIMM<0, zz, (outs), (ins GPR32:$C, MEMii:$addr),
                         !strconcat(asmop, "\t$C, [$addr]"), []>;

  def _AW_rs9 : F32_ST_RS9<0b01, 0, zz, (outs GPR32:$addrout),
                      (ins GPR32:$C, GPR32:$B, immS<9>:$S9),
                      !strconcat(asmop, ".aw\t$C, [$B,$S9]"), []>
    { let Constraints = "$addrout = $B"; }
  }
}

// Store instruction definitions.
defm ST  : ArcStInst<0b00, "st">;
defm STH : ArcStInst<0b10, "sth">;
defm STB : ArcStInst<0b01, "stb">;

// Store instruction patterns.
// 32-bit stores
def : Pat<(store i32:$C, AddrModeS9:$addr),
          (ST_rs9 i32:$C, AddrModeS9:$addr)>;
def : Pat<(store i32:$C, AddrModeImm:$addr),
          (ST_limm i32:$C, AddrModeImm:$addr)>;

// 16-bit stores
def : Pat<(truncstorei16 i32:$C, AddrModeS9:$addr),
          (STH_rs9 i32:$C, AddrModeS9:$addr)>;
def : Pat<(truncstorei16 i32:$C, AddrModeImm:$addr),
          (STH_limm i32:$C, AddrModeImm:$addr)>;

// 8-bit stores
def : Pat<(truncstorei8 i32:$C, AddrModeS9:$addr),
          (STB_rs9 i32:$C, AddrModeS9:$addr)>;
def : Pat<(truncstorei8 i32:$C, AddrModeImm:$addr),
          (STB_limm i32:$C, AddrModeImm:$addr)>;