llvm-project/llvm/lib/Target/ARM/ARMInstrThumb2.td

//===- ARMInstrThumb2.td - Thumb2 support for ARM -------------------------===//
//
//                     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 Thumb2 instruction set.
//
//===----------------------------------------------------------------------===//

// Shifted operands. No register controlled shifts for Thumb2.
// Note: We do not support rrx shifted operands yet.
def t2_so_reg : Operand<i32>,    // reg imm
                ComplexPattern<i32, 2, "SelectT2ShifterOperandReg",
                               [shl,srl,sra,rotr]> {
  let PrintMethod = "printT2SOOperand";
  let MIOperandInfo = (ops GPR, i32imm);
}

// t2_so_imm_XFORM - Return a t2_so_imm value packed into the format 
// described for t2_so_imm def below.
def t2_so_imm_XFORM : SDNodeXForm<imm, [{
  return CurDAG->getTargetConstant(
        ARM_AM::getT2SOImmVal(N->getZExtValue()), MVT::i32);
}]>;

// t2_so_imm_not_XFORM - Return the complement of a t2_so_imm value
def t2_so_imm_not_XFORM : SDNodeXForm<imm, [{
    return CurDAG->getTargetConstant(
        ARM_AM::getT2SOImmVal(~((uint32_t)N->getZExtValue())), MVT::i32);
}]>;

// t2_so_imm_neg_XFORM - Return the negation of a t2_so_imm value
def t2_so_imm_neg_XFORM : SDNodeXForm<imm, [{
    return CurDAG->getTargetConstant(
        ARM_AM::getT2SOImmVal(-((int)N->getZExtValue())), MVT::i32);
}]>;

// t2_so_imm - Match a 32-bit immediate operand, which is an
// 8-bit immediate rotated by an arbitrary number of bits, or an 8-bit
// immediate splatted into multiple bytes of the word. t2_so_imm values are
// represented in the imm field in the same 12-bit form that they are encoded
// into t2_so_imm instructions: the 8-bit immediate is the least significant bits
// [bits 0-7], the 4-bit shift/splat amount is the next 4 bits [bits 8-11].
def t2_so_imm : Operand<i32>,
                PatLeaf<(imm), [{
       return ARM_AM::getT2SOImmVal((uint32_t)N->getZExtValue()) != -1;
     }], t2_so_imm_XFORM> {
  let PrintMethod = "printT2SOImmOperand";
}

// t2_so_imm_not - Match an immediate that is a complement 
// of a t2_so_imm.
def t2_so_imm_not : Operand<i32>,
                    PatLeaf<(imm), [{
       return ARM_AM::getT2SOImmVal(~((uint32_t)N->getZExtValue())) != -1;
     }], t2_so_imm_not_XFORM> {
  let PrintMethod = "printT2SOImmOperand";
}

// t2_so_imm_neg - Match an immediate that is a negation of a t2_so_imm.
def t2_so_imm_neg : Operand<i32>,
                    PatLeaf<(imm), [{
       return ARM_AM::getT2SOImmVal(-((int)N->getZExtValue())) != -1;
     }], t2_so_imm_neg_XFORM> {
  let PrintMethod = "printT2SOImmOperand";
}

/// imm1_31 predicate - True if the 32-bit immediate is in the range [1,31].
def imm1_31 : PatLeaf<(i32 imm), [{
  return (int32_t)N->getZExtValue() >= 1 && (int32_t)N->getZExtValue() < 32;
}]>;

/// imm0_4095 predicate - True if the 32-bit immediate is in the range [0.4095].
def imm0_4095 : PatLeaf<(i32 imm), [{
  return (uint32_t)N->getZExtValue() < 4096;
}]>;

def imm0_4095_neg : PatLeaf<(i32 imm), [{ 
 return (uint32_t)(-N->getZExtValue()) < 4096; 
}], imm_neg_XFORM>; 

/// imm0_65535 predicate - True if the 32-bit immediate is in the range 
/// [0.65535].
def imm0_65535 : PatLeaf<(i32 imm), [{
  return (uint32_t)N->getZExtValue() < 65536;
}]>;

/// bf_inv_mask_imm predicate - An AND mask to clear an arbitrary width bitfield
/// e.g., 0xf000ffff
def bf_inv_mask_imm : Operand<i32>,
                      PatLeaf<(imm), [{ 
  uint32_t v = (uint32_t)N->getZExtValue();
  if (v == 0xffffffff)
    return 0;
  // naive checker. should do better, but simple is best for now since it's
  // more likely to be correct.
  while (v & 1) v >>= 1;    // shift off the leading 1's
  if (v)
    {
      while (!(v & 1)) v >>=1;  // shift off the mask
      while (v & 1) v >>= 1;    // shift off the trailing 1's
    }
  // if this is a mask for clearing a bitfield, what's left should be zero.
  return (v == 0);
}] > {
  let PrintMethod = "printBitfieldInvMaskImmOperand";
}

/// Split a 32-bit immediate into two 16 bit parts.
def t2_lo16 : SDNodeXForm<imm, [{
  return CurDAG->getTargetConstant((uint32_t)N->getZExtValue() & 0xffff,
                                   MVT::i32);
}]>;

def t2_hi16 : SDNodeXForm<imm, [{
  return CurDAG->getTargetConstant((uint32_t)N->getZExtValue() >> 16, MVT::i32);
}]>;

def t2_lo16AllZero : PatLeaf<(i32 imm), [{
  // Returns true if all low 16-bits are 0.
  return (((uint32_t)N->getZExtValue()) & 0xFFFFUL) == 0;
  }], t2_hi16>;


// Define Thumb2 specific addressing modes.

// t2addrmode_imm12  := reg + imm12
def t2addrmode_imm12 : Operand<i32>,
                       ComplexPattern<i32, 2, "SelectT2AddrModeImm12", []> {
  let PrintMethod = "printT2AddrModeImm12Operand";
  let MIOperandInfo = (ops GPR:$base, i32imm:$offsimm);
}

// t2addrmode_imm8  := reg - imm8
def t2addrmode_imm8 : Operand<i32>,
                      ComplexPattern<i32, 2, "SelectT2AddrModeImm8", []> {
  let PrintMethod = "printT2AddrModeImm8Operand";
  let MIOperandInfo = (ops GPR:$base, i32imm:$offsimm);
}

def t2am_imm8_offset : Operand<i32>,
                       ComplexPattern<i32, 1, "SelectT2AddrModeImm8Offset", []>{
  let PrintMethod = "printT2AddrModeImm8OffsetOperand";
}

// t2addrmode_imm8s4  := reg + (imm8 << 2)
def t2addrmode_imm8s4 : Operand<i32>,
                        ComplexPattern<i32, 2, "SelectT2AddrModeImm8s4", []> {
  let PrintMethod = "printT2AddrModeImm8Operand";
  let MIOperandInfo = (ops GPR:$base, i32imm:$offsimm);
}

// t2addrmode_so_reg  := reg + reg << imm2
def t2addrmode_so_reg : Operand<i32>,
                        ComplexPattern<i32, 3, "SelectT2AddrModeSoReg", []> {
  let PrintMethod = "printT2AddrModeSoRegOperand";
  let MIOperandInfo = (ops GPR:$base, GPR:$offsreg, i32imm:$offsimm);
}


//===----------------------------------------------------------------------===//
// Multiclass helpers...
//

/// T2I_un_irs - Defines a set of (op reg, {so_imm|r|so_reg}) patterns for a
/// unary operation that produces a value. These are predicable and can be
/// changed to modify CPSR.
multiclass T2I_un_irs<string opc, PatFrag opnode, bit Cheap = 0, bit ReMat = 0>{
   // shifted imm
   def i : T2sI<(outs GPR:$dst), (ins t2_so_imm:$src),
                opc, " $dst, $src",
                [(set GPR:$dst, (opnode t2_so_imm:$src))]> {
     let isAsCheapAsAMove = Cheap;
     let isReMaterializable = ReMat;
   }
   // register
   def r : T2I<(outs GPR:$dst), (ins GPR:$src),
               opc, " $dst, $src",
                [(set GPR:$dst, (opnode GPR:$src))]>;
   // shifted register
   def s : T2I<(outs GPR:$dst), (ins t2_so_reg:$src),
               opc, " $dst, $src",
               [(set GPR:$dst, (opnode t2_so_reg:$src))]>;
}

/// T2I_bin_irs - Defines a set of (op reg, {so_imm|r|so_reg}) patterns for a
//  binary operation that produces a value. These are predicable and can be
/// changed to modify CPSR.
multiclass T2I_bin_irs<string opc, PatFrag opnode, bit Commutable = 0> {
   // shifted imm
   def ri : T2sI<(outs GPR:$dst), (ins GPR:$lhs, t2_so_imm:$rhs),
                 opc, " $dst, $lhs, $rhs",
                 [(set GPR:$dst, (opnode GPR:$lhs, t2_so_imm:$rhs))]>;
   // register
   def rr : T2sI<(outs GPR:$dst), (ins GPR:$lhs, GPR:$rhs),
                 opc, " $dst, $lhs, $rhs",
                 [(set GPR:$dst, (opnode GPR:$lhs, GPR:$rhs))]> {
     let isCommutable = Commutable;
   }
   // shifted register
   def rs : T2sI<(outs GPR:$dst), (ins GPR:$lhs, t2_so_reg:$rhs),
                 opc, " $dst, $lhs, $rhs",
                 [(set GPR:$dst, (opnode GPR:$lhs, t2_so_reg:$rhs))]>;
}

/// T2I_rbin_is - Same as T2I_bin_irs except the order of operands are
/// reversed. It doesn't define the 'rr' form since it's handled by its
/// T2I_bin_irs counterpart.
multiclass T2I_rbin_is<string opc, PatFrag opnode> {
   // shifted imm
   def ri : T2I<(outs GPR:$dst), (ins GPR:$rhs, t2_so_imm:$lhs),
                opc, " $dst, $rhs, $lhs",
                [(set GPR:$dst, (opnode t2_so_imm:$lhs, GPR:$rhs))]>;
   // shifted register
   def rs : T2I<(outs GPR:$dst), (ins GPR:$rhs, t2_so_reg:$lhs),
                opc, " $dst, $rhs, $lhs",
                [(set GPR:$dst, (opnode t2_so_reg:$lhs, GPR:$rhs))]>;
}

/// T2I_bin_s_irs - Similar to T2I_bin_irs except it sets the 's' bit so the
/// instruction modifies the CPSR register.
let Defs = [CPSR] in {
multiclass T2I_bin_s_irs<string opc, PatFrag opnode, bit Commutable = 0> {
   // shifted imm
   def ri : T2I<(outs GPR:$dst), (ins GPR:$lhs, t2_so_imm:$rhs),
                !strconcat(opc, "s"), " $dst, $lhs, $rhs",
                [(set GPR:$dst, (opnode GPR:$lhs, t2_so_imm:$rhs))]>;
   // register
   def rr : T2I<(outs GPR:$dst), (ins GPR:$lhs, GPR:$rhs),
                !strconcat(opc, "s"), " $dst, $lhs, $rhs",
                [(set GPR:$dst, (opnode GPR:$lhs, GPR:$rhs))]> {
     let isCommutable = Commutable;
   }
   // shifted register
   def rs : T2I<(outs GPR:$dst), (ins GPR:$lhs, t2_so_reg:$rhs),
                !strconcat(opc, "s"), " $dst, $lhs, $rhs",
                [(set GPR:$dst, (opnode GPR:$lhs, t2_so_reg:$rhs))]>;
}
}

/// T2I_bin_ii12rs - Defines a set of (op reg, {so_imm|imm0_4095|r|so_reg})
/// patterns for a binary operation that produces a value.
multiclass T2I_bin_ii12rs<string opc, PatFrag opnode, bit Commutable = 0> {
   // shifted imm
   def ri : T2sI<(outs GPR:$dst), (ins GPR:$lhs, t2_so_imm:$rhs),
                 opc, " $dst, $lhs, $rhs",
                 [(set GPR:$dst, (opnode GPR:$lhs, t2_so_imm:$rhs))]>;
   // 12-bit imm
   def ri12 : T2sI<(outs GPR:$dst), (ins GPR:$lhs, i32imm:$rhs),
                   !strconcat(opc, "w"), " $dst, $lhs, $rhs",
                   [(set GPR:$dst, (opnode GPR:$lhs, imm0_4095:$rhs))]>;
   // register
   def rr : T2sI<(outs GPR:$dst), (ins GPR:$lhs, GPR:$rhs),
                 opc, " $dst, $lhs, $rhs",
                 [(set GPR:$dst, (opnode GPR:$lhs, GPR:$rhs))]> {
     let isCommutable = Commutable;
   }
   // shifted register
   def rs : T2sI<(outs GPR:$dst), (ins GPR:$lhs, t2_so_reg:$rhs),
                 opc, " $dst, $lhs, $rhs",
                 [(set GPR:$dst, (opnode GPR:$lhs, t2_so_reg:$rhs))]>;
}

/// T2I_adde_sube_irs - Defines a set of (op reg, {so_imm|r|so_reg}) patterns for a
/// binary operation that produces a value and use and define the carry bit.
/// It's not predicable.
let Uses = [CPSR] in {
multiclass T2I_adde_sube_irs<string opc, PatFrag opnode, bit Commutable = 0> {
   // shifted imm
   def ri : T2sI<(outs GPR:$dst), (ins GPR:$lhs, t2_so_imm:$rhs),
                 opc, " $dst, $lhs, $rhs",
                 [(set GPR:$dst, (opnode GPR:$lhs, t2_so_imm:$rhs))]>,
                 Requires<[IsThumb2, CarryDefIsUnused]>;
   // register
   def rr : T2sI<(outs GPR:$dst), (ins GPR:$lhs, GPR:$rhs),
                 opc, " $dst, $lhs, $rhs",
                 [(set GPR:$dst, (opnode GPR:$lhs, GPR:$rhs))]>,
                 Requires<[IsThumb2, CarryDefIsUnused]> {
     let isCommutable = Commutable;
   }
   // shifted register
   def rs : T2sI<(outs GPR:$dst), (ins GPR:$lhs, t2_so_reg:$rhs),
                 opc, " $dst, $lhs, $rhs",
                 [(set GPR:$dst, (opnode GPR:$lhs, t2_so_reg:$rhs))]>,
                 Requires<[IsThumb2, CarryDefIsUnused]>;
   // Carry setting variants
   // shifted imm
   def Sri : T2XI<(outs GPR:$dst), (ins GPR:$lhs, t2_so_imm:$rhs),
                  !strconcat(opc, "s $dst, $lhs, $rhs"),
                  [(set GPR:$dst, (opnode GPR:$lhs, t2_so_imm:$rhs))]>,
                  Requires<[IsThumb2, CarryDefIsUsed]> {
                    let Defs = [CPSR];
                  }
   // register
   def Srr : T2XI<(outs GPR:$dst), (ins GPR:$lhs, GPR:$rhs),
                  !strconcat(opc, "s $dst, $lhs, $rhs"),
                  [(set GPR:$dst, (opnode GPR:$lhs, GPR:$rhs))]>,
                  Requires<[IsThumb2, CarryDefIsUsed]> {
                    let Defs = [CPSR];
                    let isCommutable = Commutable;
   }
   // shifted register
   def Srs : T2XI<(outs GPR:$dst), (ins GPR:$lhs, t2_so_reg:$rhs),
                  !strconcat(opc, "s $dst, $lhs, $rhs"),
                  [(set GPR:$dst, (opnode GPR:$lhs, t2_so_reg:$rhs))]>,
                  Requires<[IsThumb2, CarryDefIsUsed]> {
                    let Defs = [CPSR];
   }
}
}

/// T2I_rsc_is - Same as T2I_adde_sube_irs except the order of operands are
/// reversed. It doesn't define the 'rr' form since it's handled by its
/// T2I_adde_sube_irs counterpart.
let Defs = [CPSR], Uses = [CPSR] in {
multiclass T2I_rsc_is<string opc, PatFrag opnode> {
   // shifted imm
   def ri : T2sI<(outs GPR:$dst), (ins GPR:$rhs, t2_so_imm:$lhs),
                 opc, " $dst, $rhs, $lhs",
                 [(set GPR:$dst, (opnode t2_so_imm:$lhs, GPR:$rhs))]>,
                 Requires<[IsThumb2, CarryDefIsUnused]>;
   // shifted register
   def rs : T2sI<(outs GPR:$dst), (ins GPR:$rhs, t2_so_reg:$lhs),
                 opc, " $dst, $rhs, $lhs",
                 [(set GPR:$dst, (opnode t2_so_reg:$lhs, GPR:$rhs))]>,
                 Requires<[IsThumb2, CarryDefIsUnused]>;
   // shifted imm
   def Sri : T2XI<(outs GPR:$dst), (ins GPR:$rhs, t2_so_imm:$lhs),
                 !strconcat(opc, "s $dst, $rhs, $lhs"),
                 [(set GPR:$dst, (opnode t2_so_imm:$lhs, GPR:$rhs))]>,
                 Requires<[IsThumb2, CarryDefIsUsed]> {
                   let Defs = [CPSR];
   }
   // shifted register
   def Srs : T2XI<(outs GPR:$dst), (ins GPR:$rhs, t2_so_reg:$lhs),
                 !strconcat(opc, "s $dst, $rhs, $lhs"),
                 [(set GPR:$dst, (opnode t2_so_reg:$lhs, GPR:$rhs))]>,
                 Requires<[IsThumb2, CarryDefIsUsed]> {
                   let Defs = [CPSR];
   }
}
}

/// T2I_rbin_s_is - Same as T2I_bin_s_irs except the order of operands are
/// reversed. It doesn't define the 'rr' form since it's handled by its
/// T2I_bin_s_irs counterpart.
let Defs = [CPSR] in {
multiclass T2I_rbin_s_is<string opc, PatFrag opnode> {
   // shifted imm
   def ri : T2XI<(outs GPR:$dst), (ins GPR:$rhs, t2_so_imm:$lhs, cc_out:$s),
                 !strconcat(opc, "${s} $dst, $rhs, $lhs"),
                 [(set GPR:$dst, (opnode t2_so_imm:$lhs, GPR:$rhs))]>;
   // shifted register
   def rs : T2XI<(outs GPR:$dst), (ins GPR:$rhs, t2_so_reg:$lhs, cc_out:$s),
                 !strconcat(opc, "${s} $dst, $rhs, $lhs"),
                 [(set GPR:$dst, (opnode t2_so_reg:$lhs, GPR:$rhs))]>;
}
}

/// T2I_sh_ir - Defines a set of (op reg, {so_imm|r}) patterns for a shift /
//  rotate operation that produces a value.
multiclass T2I_sh_ir<string opc, PatFrag opnode> {
   // 5-bit imm
   def ri : T2sI<(outs GPR:$dst), (ins GPR:$lhs, i32imm:$rhs),
                 opc, " $dst, $lhs, $rhs",
                 [(set GPR:$dst, (opnode GPR:$lhs, imm1_31:$rhs))]>;
   // register
   def rr : T2sI<(outs GPR:$dst), (ins GPR:$lhs, GPR:$rhs),
                 opc, " $dst, $lhs, $rhs",
                 [(set GPR:$dst, (opnode GPR:$lhs, GPR:$rhs))]>;
}

/// T21_cmp_irs - Defines a set of (op r, {so_imm|r|so_reg}) cmp / test
/// patterns. Similar to T2I_bin_irs except the instruction does not produce
/// a explicit result, only implicitly set CPSR.
let Uses = [CPSR] in {
multiclass T2I_cmp_is<string opc, PatFrag opnode> {
   // shifted imm
   def ri : T2I<(outs), (ins GPR:$lhs, t2_so_imm:$rhs),
                opc, " $lhs, $rhs",
                [(opnode GPR:$lhs, t2_so_imm:$rhs)]>;
   // register
   def rr : T2I<(outs), (ins GPR:$lhs, GPR:$rhs),
                opc, " $lhs, $rhs",
                [(opnode GPR:$lhs, GPR:$rhs)]>;
   // shifted register
   def rs : T2I<(outs), (ins GPR:$lhs, t2_so_reg:$rhs),
                opc, " $lhs, $rhs",
                [(opnode GPR:$lhs, t2_so_reg:$rhs)]>;
}
}

/// T2I_ld - Defines a set of (op r, {imm12|imm8|so_reg}) load patterns.
multiclass T2I_ld<string opc, PatFrag opnode> {
  def i12 : T2Ii12<(outs GPR:$dst), (ins t2addrmode_imm12:$addr),
                   opc, " $dst, $addr",
                   [(set GPR:$dst, (opnode t2addrmode_imm12:$addr))]>;
  def i8  : T2Ii8 <(outs GPR:$dst), (ins t2addrmode_imm8:$addr),
                   opc, " $dst, $addr",
                   [(set GPR:$dst, (opnode t2addrmode_imm8:$addr))]>;
  def s   : T2Iso <(outs GPR:$dst), (ins t2addrmode_so_reg:$addr),
                   opc, " $dst, $addr",
                   [(set GPR:$dst, (opnode t2addrmode_so_reg:$addr))]>;
  def pci : T2Ipc <(outs GPR:$dst), (ins i32imm:$addr),
                   opc, " $dst, $addr",
                   [(set GPR:$dst, (opnode (ARMWrapper tconstpool:$addr)))]>;
}

/// T2I_st - Defines a set of (op r, {imm12|imm8|so_reg}) store patterns.
multiclass T2I_st<string opc, PatFrag opnode> {
  def i12 : T2Ii12<(outs), (ins GPR:$src, t2addrmode_imm12:$addr),
                   opc, " $src, $addr",
                   [(opnode GPR:$src, t2addrmode_imm12:$addr)]>;
  def i8  : T2Ii8 <(outs), (ins GPR:$src, t2addrmode_imm8:$addr),
                   opc, " $src, $addr",
                   [(opnode GPR:$src, t2addrmode_imm8:$addr)]>;
  def s   : T2Iso <(outs), (ins GPR:$src, t2addrmode_so_reg:$addr),
                   opc, " $src, $addr",
                   [(opnode GPR:$src, t2addrmode_so_reg:$addr)]>;
}

/// T2I_picld - Defines the PIC load pattern.
class T2I_picld<string opc, PatFrag opnode> :
      T2I<(outs GPR:$dst), (ins addrmodepc:$addr),
          !strconcat("${addr:label}:\n\t", opc), " $dst, $addr",
          [(set GPR:$dst, (opnode addrmodepc:$addr))]>;

/// T2I_picst - Defines the PIC store pattern.
class T2I_picst<string opc, PatFrag opnode> :
      T2I<(outs), (ins GPR:$src, addrmodepc:$addr),
          !strconcat("${addr:label}:\n\t", opc), " $src, $addr",
          [(opnode GPR:$src, addrmodepc:$addr)]>;

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

//===----------------------------------------------------------------------===//
//  Miscellaneous Instructions.
//

let isNotDuplicable = 1 in
def t2PICADD : T2XI<(outs tGPR:$dst), (ins tGPR:$lhs, pclabel:$cp),
                    "$cp:\n\tadd $dst, pc",
                    [(set tGPR:$dst, (ARMpic_add tGPR:$lhs, imm:$cp))]>;


// LEApcrel - Load a pc-relative address into a register without offending the
// assembler.
def t2LEApcrel : T2XI<(outs GPR:$dst), (ins i32imm:$label, pred:$p),
                   !strconcat(!strconcat(".set PCRELV${:uid}, ($label-(",
                                         "${:private}PCRELL${:uid}+8))\n"),
                              !strconcat("${:private}PCRELL${:uid}:\n\t",
                                         "add$p $dst, pc, #PCRELV${:uid}")),
                   []>;

def t2LEApcrelJT : T2XI<(outs GPR:$dst),
                       (ins i32imm:$label, i32imm:$id, pred:$p),
          !strconcat(!strconcat(".set PCRELV${:uid}, (${label}_${id:no_hash}-(",
                                         "${:private}PCRELL${:uid}+8))\n"),
                              !strconcat("${:private}PCRELL${:uid}:\n\t",
                                         "add$p $dst, pc, #PCRELV${:uid}")),
                   []>;

// ADD rd, sp, #so_imm
def t2ADDrSPi : T2XI<(outs GPR:$dst), (ins GPR:$sp, t2_so_imm:$imm),
                     "add $dst, $sp, $imm",
                     []>;

// ADD rd, sp, #imm12
def t2ADDrSPi12 : T2XI<(outs GPR:$dst), (ins GPR:$sp, i32imm:$imm),
                       "addw $dst, $sp, $imm",
                       []>;

def t2ADDrSPs : T2XI<(outs GPR:$dst), (ins GPR:$sp, t2_so_reg:$rhs),
                     "addw $dst, $sp, $rhs",
                     []>;


//===----------------------------------------------------------------------===//
//  Load / store Instructions.
//

// Load
let canFoldAsLoad = 1 in
defm t2LDR   : T2I_ld<"ldr",  UnOpFrag<(load node:$Src)>>;

// Loads with zero extension
defm t2LDRH  : T2I_ld<"ldrh", UnOpFrag<(zextloadi16 node:$Src)>>;
defm t2LDRB  : T2I_ld<"ldrb", UnOpFrag<(zextloadi8  node:$Src)>>;

// Loads with sign extension
defm t2LDRSH : T2I_ld<"ldrsh", UnOpFrag<(sextloadi16 node:$Src)>>;
defm t2LDRSB : T2I_ld<"ldrsb", UnOpFrag<(sextloadi8  node:$Src)>>;

let mayLoad = 1 in {
// Load doubleword
def t2LDRDi8 : T2Ii8s4<(outs GPR:$dst), (ins t2addrmode_imm8s4:$addr),
                       "ldrd", " $dst, $addr", []>;
def t2LDRDpci : T2Ii8s4<(outs GPR:$dst), (ins i32imm:$addr),
                       "ldrd", " $dst, $addr", []>;
}

// zextload i1 -> zextload i8
def : T2Pat<(zextloadi1 t2addrmode_imm12:$addr),
            (t2LDRBi12  t2addrmode_imm12:$addr)>;
def : T2Pat<(zextloadi1 t2addrmode_imm8:$addr),
            (t2LDRBi8   t2addrmode_imm8:$addr)>;
def : T2Pat<(zextloadi1 t2addrmode_so_reg:$addr),
            (t2LDRBs    t2addrmode_so_reg:$addr)>;
def : T2Pat<(zextloadi1 (ARMWrapper tconstpool:$addr)),
            (t2LDRBpci  tconstpool:$addr)>;

// extload -> zextload
// FIXME: Reduce the number of patterns by legalizing extload to zextload
// earlier?
def : T2Pat<(extloadi1  t2addrmode_imm12:$addr),
            (t2LDRBi12  t2addrmode_imm12:$addr)>;
def : T2Pat<(extloadi1  t2addrmode_imm8:$addr),
            (t2LDRBi8   t2addrmode_imm8:$addr)>;
def : T2Pat<(extloadi1  t2addrmode_so_reg:$addr),
            (t2LDRBs    t2addrmode_so_reg:$addr)>;
def : T2Pat<(extloadi1  (ARMWrapper tconstpool:$addr)),
            (t2LDRBpci  tconstpool:$addr)>;

def : T2Pat<(extloadi8  t2addrmode_imm12:$addr),
            (t2LDRBi12  t2addrmode_imm12:$addr)>;
def : T2Pat<(extloadi8  t2addrmode_imm8:$addr),
            (t2LDRBi8   t2addrmode_imm8:$addr)>;
def : T2Pat<(extloadi8  t2addrmode_so_reg:$addr),
            (t2LDRBs    t2addrmode_so_reg:$addr)>;
def : T2Pat<(extloadi8  (ARMWrapper tconstpool:$addr)),
            (t2LDRBpci  tconstpool:$addr)>;

def : T2Pat<(extloadi16 t2addrmode_imm12:$addr),
            (t2LDRHi12  t2addrmode_imm12:$addr)>;
def : T2Pat<(extloadi16 t2addrmode_imm8:$addr),
            (t2LDRHi8   t2addrmode_imm8:$addr)>;
def : T2Pat<(extloadi16 t2addrmode_so_reg:$addr),
            (t2LDRHs    t2addrmode_so_reg:$addr)>;
def : T2Pat<(extloadi16 (ARMWrapper tconstpool:$addr)),
            (t2LDRHpci  tconstpool:$addr)>;

// Indexed loads
def t2LDR_PRE  : T2Iidxldst<(outs GPR:$dst, GPR:$base_wb),
                            (ins t2addrmode_imm8:$addr),
                            AddrModeT2_i8, IndexModePre,
                            "ldr", " $dst, $addr!", "$addr.base = $base_wb",
                            []>;

def t2LDR_POST : T2Iidxldst<(outs GPR:$dst, GPR:$base_wb),
                            (ins GPR:$base, t2am_imm8_offset:$offset),
                            AddrModeT2_i8, IndexModePost,
                           "ldr", " $dst, [$base], $offset", "$base = $base_wb",
                            []>;

def t2LDRB_PRE : T2Iidxldst<(outs GPR:$dst, GPR:$base_wb),
                            (ins t2addrmode_imm8:$addr),
                            AddrModeT2_i8, IndexModePre,
                            "ldrb", " $dst, $addr!", "$addr.base = $base_wb",
                            []>;
def t2LDRB_POST : T2Iidxldst<(outs GPR:$dst, GPR:$base_wb),
                            (ins GPR:$base, t2am_imm8_offset:$offset),
                            AddrModeT2_i8, IndexModePost,
                          "ldrb", " $dst, [$base], $offset", "$base = $base_wb",
                            []>;

def t2LDRH_PRE : T2Iidxldst<(outs GPR:$dst, GPR:$base_wb),
                            (ins t2addrmode_imm8:$addr),
                            AddrModeT2_i8, IndexModePre,
                            "ldrh", " $dst, $addr!", "$addr.base = $base_wb",
                            []>;
def t2LDRH_POST : T2Iidxldst<(outs GPR:$dst, GPR:$base_wb),
                            (ins GPR:$base, t2am_imm8_offset:$offset),
                            AddrModeT2_i8, IndexModePost,
                          "ldrh", " $dst, [$base], $offset", "$base = $base_wb",
                            []>;

def t2LDRSB_PRE : T2Iidxldst<(outs GPR:$dst, GPR:$base_wb),
                            (ins t2addrmode_imm8:$addr),
                            AddrModeT2_i8, IndexModePre,
                            "ldrsb", " $dst, $addr!", "$addr.base = $base_wb",
                            []>;
def t2LDRSB_POST : T2Iidxldst<(outs GPR:$dst, GPR:$base_wb),
                            (ins GPR:$base, t2am_imm8_offset:$offset),
                            AddrModeT2_i8, IndexModePost,
                         "ldrsb", " $dst, [$base], $offset", "$base = $base_wb",
                            []>;

def t2LDRSH_PRE : T2Iidxldst<(outs GPR:$dst, GPR:$base_wb),
                            (ins t2addrmode_imm8:$addr),
                            AddrModeT2_i8, IndexModePre,
                            "ldrsh", " $dst, $addr!", "$addr.base = $base_wb",
                            []>;
def t2LDRSH_POST : T2Iidxldst<(outs GPR:$dst, GPR:$base_wb),
                            (ins GPR:$base, t2am_imm8_offset:$offset),
                            AddrModeT2_i8, IndexModePost,
                         "ldrsh", " $dst, [$base], $offset", "$base = $base_wb",
                            []>;

// Store
defm t2STR   : T2I_st<"str",  BinOpFrag<(store node:$LHS, node:$RHS)>>;
defm t2STRB  : T2I_st<"strb", BinOpFrag<(truncstorei8 node:$LHS, node:$RHS)>>;
defm t2STRH  : T2I_st<"strh", BinOpFrag<(truncstorei16 node:$LHS, node:$RHS)>>;

// Store doubleword
let mayLoad = 1 in
def t2STRDi8 : T2Ii8s4<(outs), (ins GPR:$src, t2addrmode_imm8s4:$addr),
                        "strd", " $src, $addr", []>;

// Indexed stores
def t2STR_PRE  : T2Iidxldst<(outs GPR:$base_wb),
                            (ins GPR:$src, GPR:$base, t2am_imm8_offset:$offset),
                            AddrModeT2_i8, IndexModePre,
                          "str", " $src, [$base, $offset]!", "$base = $base_wb",
             [(set GPR:$base_wb,
                   (pre_store GPR:$src, GPR:$base, t2am_imm8_offset:$offset))]>;

def t2STR_POST : T2Iidxldst<(outs GPR:$base_wb),
                            (ins GPR:$src, GPR:$base, t2am_imm8_offset:$offset),
                            AddrModeT2_i8, IndexModePost,
                           "str", " $src, [$base], $offset", "$base = $base_wb",
             [(set GPR:$base_wb,
                   (post_store GPR:$src, GPR:$base, t2am_imm8_offset:$offset))]>;

def t2STRH_PRE  : T2Iidxldst<(outs GPR:$base_wb),
                            (ins GPR:$src, GPR:$base, t2am_imm8_offset:$offset),
                            AddrModeT2_i8, IndexModePre,
                         "strh", " $src, [$base, $offset]!", "$base = $base_wb",
        [(set GPR:$base_wb,
              (pre_truncsti16 GPR:$src, GPR:$base, t2am_imm8_offset:$offset))]>;

def t2STRH_POST : T2Iidxldst<(outs GPR:$base_wb),
                            (ins GPR:$src, GPR:$base, t2am_imm8_offset:$offset),
                            AddrModeT2_i8, IndexModePost,
                          "strh", " $src, [$base], $offset", "$base = $base_wb",
       [(set GPR:$base_wb,
             (post_truncsti16 GPR:$src, GPR:$base, t2am_imm8_offset:$offset))]>;

def t2STRB_PRE  : T2Iidxldst<(outs GPR:$base_wb),
                            (ins GPR:$src, GPR:$base, t2am_imm8_offset:$offset),
                            AddrModeT2_i8, IndexModePre,
                         "strb", " $src, [$base, $offset]!", "$base = $base_wb",
         [(set GPR:$base_wb,
               (pre_truncsti8 GPR:$src, GPR:$base, t2am_imm8_offset:$offset))]>;

def t2STRB_POST : T2Iidxldst<(outs GPR:$base_wb),
                            (ins GPR:$src, GPR:$base, t2am_imm8_offset:$offset),
                            AddrModeT2_i8, IndexModePost,
                          "strb", " $src, [$base], $offset", "$base = $base_wb",
        [(set GPR:$base_wb,
              (post_truncsti8 GPR:$src, GPR:$base, t2am_imm8_offset:$offset))]>;


// Address computation and loads and stores in PIC mode.
let isNotDuplicable = 1, AddedComplexity = 10 in {
let canFoldAsLoad = 1 in
def t2PICLDR   : T2I_picld<"ldr",  UnOpFrag<(load node:$Src)>>;

def t2PICLDRH  : T2I_picld<"ldrh", UnOpFrag<(zextloadi16 node:$Src)>>;
def t2PICLDRB  : T2I_picld<"ldrb", UnOpFrag<(zextloadi8 node:$Src)>>;
def t2PICLDRSH : T2I_picld<"ldrsh", UnOpFrag<(sextloadi16 node:$Src)>>;
def t2PICLDRSB : T2I_picld<"ldrsb", UnOpFrag<(sextloadi8 node:$Src)>>;

def t2PICSTR   : T2I_picst<"str", BinOpFrag<(store node:$LHS, node:$RHS)>>;
def t2PICSTRH  : T2I_picst<"strh", BinOpFrag<(truncstorei16 node:$LHS, node:$RHS)>>;
def t2PICSTRB  : T2I_picst<"strb", BinOpFrag<(truncstorei8 node:$LHS, node:$RHS)>>;
} // isNotDuplicable = 1, AddedComplexity = 10

//===----------------------------------------------------------------------===//
//  Move Instructions.
//

let neverHasSideEffects = 1 in
def t2MOVr : T2sI<(outs GPR:$dst), (ins GPR:$src),
                   "mov", " $dst, $src", []>;

let isReMaterializable = 1, isAsCheapAsAMove = 1 in
def t2MOVi : T2sI<(outs GPR:$dst), (ins t2_so_imm:$src),
                   "mov", " $dst, $src",
                   [(set GPR:$dst, t2_so_imm:$src)]>;

let isReMaterializable = 1, isAsCheapAsAMove = 1 in
def t2MOVi16 : T2I<(outs GPR:$dst), (ins i32imm:$src),
                   "movw", " $dst, $src",
                   [(set GPR:$dst, imm0_65535:$src)]>;

// FIXME: Also available in ARM mode.
let Constraints = "$src = $dst" in
def t2MOVTi16 : T2sI<(outs GPR:$dst), (ins GPR:$src, i32imm:$imm),
                     "movt", " $dst, $imm",
                     [(set GPR:$dst,
                           (or (and GPR:$src, 0xffff), t2_lo16AllZero:$imm))]>;

//===----------------------------------------------------------------------===//
//  Arithmetic Instructions.
//

defm t2ADD  : T2I_bin_ii12rs<"add", BinOpFrag<(add  node:$LHS, node:$RHS)>, 1>;
defm t2SUB  : T2I_bin_ii12rs<"sub", BinOpFrag<(sub  node:$LHS, node:$RHS)>>;

// ADD and SUB with 's' bit set. No 12-bit immediate (T4) variants.
defm t2ADDS : T2I_bin_s_irs <"add",  BinOpFrag<(addc node:$LHS, node:$RHS)>, 1>;
defm t2SUBS : T2I_bin_s_irs <"sub",  BinOpFrag<(subc node:$LHS, node:$RHS)>>;

defm t2ADC  : T2I_adde_sube_irs<"adc",BinOpFrag<(adde node:$LHS, node:$RHS)>,1>;
defm t2SBC  : T2I_adde_sube_irs<"sbc",BinOpFrag<(sube node:$LHS, node:$RHS)>>;

// RSB, RSC
defm t2RSB  : T2I_rbin_is   <"rsb", BinOpFrag<(sub  node:$LHS, node:$RHS)>>;
defm t2RSBS : T2I_rbin_s_is <"rsb", BinOpFrag<(subc node:$LHS, node:$RHS)>>;
defm t2RSC  : T2I_rsc_is    <"rsc", BinOpFrag<(sube node:$LHS, node:$RHS)>>;

// (sub X, imm) gets canonicalized to (add X, -imm).  Match this form.
def : T2Pat<(add       GPR:$src, t2_so_imm_neg:$imm),
            (t2SUBri   GPR:$src, t2_so_imm_neg:$imm)>;
def : T2Pat<(add       GPR:$src, imm0_4095_neg:$imm),
            (t2SUBri12 GPR:$src, imm0_4095_neg:$imm)>;


//===----------------------------------------------------------------------===//
//  Shift and rotate Instructions.
//

defm t2LSL  : T2I_sh_ir<"lsl", BinOpFrag<(shl  node:$LHS, node:$RHS)>>;
defm t2LSR  : T2I_sh_ir<"lsr", BinOpFrag<(srl  node:$LHS, node:$RHS)>>;
defm t2ASR  : T2I_sh_ir<"asr", BinOpFrag<(sra  node:$LHS, node:$RHS)>>;
defm t2ROR  : T2I_sh_ir<"ror", BinOpFrag<(rotr node:$LHS, node:$RHS)>>;

def t2MOVrx : T2sI<(outs GPR:$dst), (ins GPR:$src),
                   "mov", " $dst, $src, rrx",
                   [(set GPR:$dst, (ARMrrx GPR:$src))]>;

//===----------------------------------------------------------------------===//
//  Bitwise Instructions.
//

defm t2AND  : T2I_bin_irs<"and", BinOpFrag<(and node:$LHS, node:$RHS)>, 1>;
defm t2ORR  : T2I_bin_irs<"orr", BinOpFrag<(or  node:$LHS, node:$RHS)>, 1>;
defm t2EOR  : T2I_bin_irs<"eor", BinOpFrag<(xor node:$LHS, node:$RHS)>, 1>;

defm t2BIC  : T2I_bin_irs<"bic", BinOpFrag<(and node:$LHS, (not node:$RHS))>>;

def : T2Pat<(and     GPR:$src, t2_so_imm_not:$imm),
            (t2BICri GPR:$src, t2_so_imm_not:$imm)>;

defm t2ORN  : T2I_bin_irs<"orn", BinOpFrag<(or  node:$LHS, (not node:$RHS))>>;

def : T2Pat<(or      GPR:$src, t2_so_imm_not:$imm),
            (t2ORNri GPR:$src, t2_so_imm_not:$imm)>;

// Prefer over of t2EORri ra, rb, -1 because mvn has 16-bit version
let AddedComplexity = 1 in
defm t2MVN  : T2I_un_irs  <"mvn", UnOpFrag<(not node:$Src)>, 1, 1>;

def : T2Pat<(t2_so_imm_not:$src),
            (t2MVNi t2_so_imm_not:$src)>;

// A8.6.17  BFC - Bitfield clear
// FIXME: Also available in ARM mode.
let Constraints = "$src = $dst" in
def t2BFC : T2I<(outs GPR:$dst), (ins GPR:$src, bf_inv_mask_imm:$imm),
                "bfc", " $dst, $imm",
                [(set GPR:$dst, (and GPR:$src, bf_inv_mask_imm:$imm))]>;

// FIXME: A8.6.18  BFI - Bitfield insert (Encoding T1)

//===----------------------------------------------------------------------===//
//  Multiply Instructions.
//
let isCommutable = 1 in
def t2MUL: T2I<(outs GPR:$dst), (ins GPR:$a, GPR:$b),
                "mul", " $dst, $a, $b",
                [(set GPR:$dst, (mul GPR:$a, GPR:$b))]>;

def t2MLA: T2I<(outs GPR:$dst), (ins GPR:$a, GPR:$b, GPR:$c),
		"mla", " $dst, $a, $b, $c",
		[(set GPR:$dst, (add (mul GPR:$a, GPR:$b), GPR:$c))]>;

def t2MLS: T2I<(outs GPR:$dst), (ins GPR:$a, GPR:$b, GPR:$c),
		"mls", " $dst, $a, $b, $c",
                [(set GPR:$dst, (sub GPR:$c, (mul GPR:$a, GPR:$b)))]>;

// FIXME: SMULL, etc.

//===----------------------------------------------------------------------===//
//  Misc. Arithmetic Instructions.
//

def t2CLZ : T2I<(outs GPR:$dst), (ins GPR:$src),
                "clz", " $dst, $src",
                [(set GPR:$dst, (ctlz GPR:$src))]>;

def t2REV : T2I<(outs GPR:$dst), (ins GPR:$src),
                "rev", " $dst, $src",
                [(set GPR:$dst, (bswap GPR:$src))]>;

def t2REV16 : T2I<(outs GPR:$dst), (ins GPR:$src),
                "rev16", " $dst, $src",
                [(set GPR:$dst,
                    (or (and (srl GPR:$src, (i32 8)), 0xFF),
                        (or (and (shl GPR:$src, (i32 8)), 0xFF00),
                            (or (and (srl GPR:$src, (i32 8)), 0xFF0000),
                                (and (shl GPR:$src, (i32 8)), 0xFF000000)))))]>;

/////
/// A8.6.137  REVSH
/////
def t2REVSH : T2I<(outs GPR:$dst), (ins GPR:$src),
                 "revsh", " $dst, $src",
                 [(set GPR:$dst,
                    (sext_inreg
                      (or (srl (and GPR:$src, 0xFFFF), (i32 8)),
                          (shl GPR:$src, (i32 8))), i16))]>;

// FIXME: PKHxx etc.

//===----------------------------------------------------------------------===//
//  Comparison Instructions...
//

defm t2CMP   : T2I_cmp_is<"cmp",
                          BinOpFrag<(ARMcmp node:$LHS, node:$RHS)>>;
defm t2CMPz : T2I_cmp_is<"cmp",
                         BinOpFrag<(ARMcmpZ node:$LHS, node:$RHS)>>;

defm t2CMN   : T2I_cmp_is<"cmn",
                          BinOpFrag<(ARMcmp node:$LHS,(ineg node:$RHS))>>;
defm t2CMNz : T2I_cmp_is<"cmn",
                         BinOpFrag<(ARMcmpZ node:$LHS,(ineg node:$RHS))>>;

def : T2Pat<(ARMcmp  GPR:$src, t2_so_imm_neg:$imm),
            (t2CMNri GPR:$src, t2_so_imm_neg:$imm)>;

def : T2Pat<(ARMcmpZ  GPR:$src, t2_so_imm_neg:$imm),
            (t2CMNri   GPR:$src, t2_so_imm_neg:$imm)>;

defm t2TST  : T2I_cmp_is<"tst",
                         BinOpFrag<(ARMcmpZ (and node:$LHS, node:$RHS), 0)>>;
defm t2TEQ  : T2I_cmp_is<"teq",
                         BinOpFrag<(ARMcmpZ (xor node:$LHS, node:$RHS), 0)>>;

// A8.6.27  CBNZ, CBZ - Compare and branch on (non)zero.
// Short range conditional branch. Looks awesome for loops. Need to figure
// out how to use this one.

// FIXME: Conditional moves

//===----------------------------------------------------------------------===//
// Control-Flow Instructions
//

let isBranch = 1, isTerminator = 1, isBarrier = 1 in {
let isPredicable = 1 in
def t2B   : T2XI<(outs), (ins brtarget:$target),
                 "b $target",
                 [(br bb:$target)]>;

let isNotDuplicable = 1, isIndirectBranch = 1 in {
def t2BR_JTr : T2JTI<(outs), (ins GPR:$target, jtblock_operand:$jt, i32imm:$id),
                     "mov pc, $target \n$jt",
                     [(ARMbrjt GPR:$target, tjumptable:$jt, imm:$id)]>;

def t2BR_JTm : 
    T2JTI<(outs),
          (ins t2addrmode_so_reg:$target, jtblock_operand:$jt, i32imm:$id),
          "ldr pc, $target \n$jt",
          [(ARMbrjt (i32 (load t2addrmode_so_reg:$target)), tjumptable:$jt,
             imm:$id)]>;

def t2BR_JTadd : 
    T2JTI<(outs),
          (ins GPR:$target, GPR:$idx, jtblock_operand:$jt, i32imm:$id),
          "add pc, $target, $idx \n$jt",
          [(ARMbrjt (add GPR:$target, GPR:$idx), tjumptable:$jt, imm:$id)]>;
} // isNotDuplicate, isIndirectBranch
} // isBranch, isTerminator, isBarrier

// FIXME: should be able to write a pattern for ARMBrcond, but can't use
// a two-value operand where a dag node expects two operands. :(
let isBranch = 1, isTerminator = 1 in
def t2Bcc : T2I<(outs), (ins brtarget:$target), 
                "b", " $target",
                [/*(ARMbrcond bb:$target, imm:$cc)*/]>;

//===----------------------------------------------------------------------===//
// Non-Instruction Patterns
//

// ConstantPool, GlobalAddress, and JumpTable
def : T2Pat<(ARMWrapper  tglobaladdr :$dst), (t2LEApcrel tglobaladdr :$dst)>;
def : T2Pat<(ARMWrapper  tconstpool  :$dst), (t2LEApcrel tconstpool  :$dst)>;
def : T2Pat<(ARMWrapperJT tjumptable:$dst, imm:$id),
            (t2LEApcrelJT tjumptable:$dst, imm:$id)>;

// Large immediate handling.

def : T2Pat<(i32 imm:$src),
            (t2MOVTi16 (t2MOVi16 (t2_lo16 imm:$src)), (t2_hi16 imm:$src))>;