lib/Target/ARM/ARMInstrVFP.td

//===- ARMInstrVFP.td - VFP support for ARM ----------------*- 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 ARM VFP instruction set.
//
//===----------------------------------------------------------------------===//

def SDT_FTOI    : SDTypeProfile<1, 1, [SDTCisVT<0, f32>, SDTCisFP<1>]>;
def SDT_ITOF    : SDTypeProfile<1, 1, [SDTCisFP<0>, SDTCisVT<1, f32>]>;
def SDT_CMPFP0  : SDTypeProfile<0, 1, [SDTCisFP<0>]>;
def SDT_VMOVDRR : SDTypeProfile<1, 2, [SDTCisVT<0, f64>, SDTCisVT<1, i32>,
                                       SDTCisSameAs<1, 2>]>;

def arm_ftoui  : SDNode<"ARMISD::FTOUI",   SDT_FTOI>;
def arm_ftosi  : SDNode<"ARMISD::FTOSI",   SDT_FTOI>;
def arm_sitof  : SDNode<"ARMISD::SITOF",   SDT_ITOF>;
def arm_uitof  : SDNode<"ARMISD::UITOF",   SDT_ITOF>;
def arm_fmstat : SDNode<"ARMISD::FMSTAT",  SDTNone, [SDNPInFlag, SDNPOutFlag]>;
def arm_cmpfp  : SDNode<"ARMISD::CMPFP",   SDT_ARMCmp, [SDNPOutFlag]>;
def arm_cmpfp0 : SDNode<"ARMISD::CMPFPw0", SDT_CMPFP0, [SDNPOutFlag]>;
def arm_fmdrr  : SDNode<"ARMISD::VMOVDRR", SDT_VMOVDRR>;


//===----------------------------------------------------------------------===//
// Operand Definitions.
//

def vfp_f32imm : Operand<f32>,
                 PatLeaf<(f32 fpimm), [{
      return ARM::getVFPf32Imm(N->getValueAPF()) != -1;
    }]> {
  let PrintMethod = "printVFPf32ImmOperand";
}

def vfp_f64imm : Operand<f64>,
                 PatLeaf<(f64 fpimm), [{
      return ARM::getVFPf64Imm(N->getValueAPF()) != -1;
    }]> {
  let PrintMethod = "printVFPf64ImmOperand";
}


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

let canFoldAsLoad = 1, isReMaterializable = 1 in {
def VLDRD : ADI5<0b1101, 0b01, (outs DPR:$Dd), (ins addrmode5:$addr),
                 IIC_fpLoad64, "vldr", ".64\t$Dd, $addr",
                 [(set DPR:$Dd, (f64 (load addrmode5:$addr)))]> {
  // Instruction operands.
  bits<5> Dd;
  bits<32> addr;

  // Encode instruction operands.
  let Inst{23}    = addr{16};     // U (add = (U == '1'))
  let Inst{22}    = Dd{4};
  let Inst{19-16} = addr{20-17};  // Rn
  let Inst{15-12} = Dd{3-0};
  let Inst{7-0}   = addr{7-0};    // imm8
}

def VLDRS : ASI5<0b1101, 0b01, (outs SPR:$dst), (ins addrmode5:$addr),
                 IIC_fpLoad32, "vldr", ".32\t$dst, $addr",
                 [(set SPR:$dst, (load addrmode5:$addr))]>;
} // canFoldAsLoad

def VSTRD : ADI5<0b1101, 0b00, (outs), (ins DPR:$src, addrmode5:$addr),
                 IIC_fpStore64, "vstr", ".64\t$src, $addr",
                 [(store (f64 DPR:$src), addrmode5:$addr)]>;

def VSTRS : ASI5<0b1101, 0b00, (outs), (ins SPR:$src, addrmode5:$addr),
                 IIC_fpStore32, "vstr", ".32\t$src, $addr",
                 [(store SPR:$src, addrmode5:$addr)]>;

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

let mayLoad = 1, neverHasSideEffects = 1, hasExtraDefRegAllocReq = 1,
    isCodeGenOnly = 1 in {
def VLDMD : AXDI4<(outs), (ins addrmode4:$addr, pred:$p, reglist:$dsts,
                           variable_ops), IndexModeNone, IIC_fpLoad_m,
                  "vldm${addr:submode}${p}\t$addr, $dsts", "", []> {
  let Inst{20} = 1;
}

def VLDMS : AXSI4<(outs), (ins addrmode4:$addr, pred:$p, reglist:$dsts,
                           variable_ops), IndexModeNone, IIC_fpLoad_m,
                  "vldm${addr:submode}${p}\t$addr, $dsts", "", []> {
  let Inst{20} = 1;
}

def VLDMD_UPD : AXDI4<(outs GPR:$wb), (ins addrmode4:$addr, pred:$p,
                                       reglist:$dsts, variable_ops),
                      IndexModeUpd, IIC_fpLoad_mu,
                      "vldm${addr:submode}${p}\t$addr!, $dsts",
                      "$addr.addr = $wb", []> {
  let Inst{20} = 1;
}

def VLDMS_UPD : AXSI4<(outs GPR:$wb), (ins addrmode4:$addr, pred:$p,
                                       reglist:$dsts, variable_ops),
                      IndexModeUpd, IIC_fpLoad_mu, 
                      "vldm${addr:submode}${p}\t$addr!, $dsts",
                      "$addr.addr = $wb", []> {
  let Inst{20} = 1;
}
} // mayLoad, neverHasSideEffects, hasExtraDefRegAllocReq

let mayStore = 1, neverHasSideEffects = 1, hasExtraSrcRegAllocReq = 1,
    isCodeGenOnly = 1 in {
def VSTMD : AXDI4<(outs), (ins addrmode4:$addr, pred:$p, reglist:$srcs,
                           variable_ops), IndexModeNone, IIC_fpStore_m,
                  "vstm${addr:submode}${p}\t$addr, $srcs", "", []> {
  let Inst{20} = 0;
}

def VSTMS : AXSI4<(outs), (ins addrmode4:$addr, pred:$p, reglist:$srcs,
                           variable_ops), IndexModeNone, IIC_fpStore_m,
                  "vstm${addr:submode}${p}\t$addr, $srcs", "", []> {
  let Inst{20} = 0;
}

def VSTMD_UPD : AXDI4<(outs GPR:$wb), (ins addrmode4:$addr, pred:$p,
                                       reglist:$srcs, variable_ops),
                      IndexModeUpd, IIC_fpStore_mu,
                      "vstm${addr:submode}${p}\t$addr!, $srcs",
                      "$addr.addr = $wb", []> {
  let Inst{20} = 0;
}

def VSTMS_UPD : AXSI4<(outs GPR:$wb), (ins addrmode4:$addr, pred:$p,
                                       reglist:$srcs, variable_ops),
                      IndexModeUpd, IIC_fpStore_mu,
                      "vstm${addr:submode}${p}\t$addr!, $srcs",
                      "$addr.addr = $wb", []> {
  let Inst{20} = 0;
}
} // mayStore, neverHasSideEffects, hasExtraSrcRegAllocReq

// FLDMX, FSTMX - mixing S/D registers for pre-armv6 cores

//===----------------------------------------------------------------------===//
// FP Binary Operations.
//

def VADDD  : ADbI<0b11100, 0b11, 0, 0,
                  (outs DPR:$Dd), (ins DPR:$Dn, DPR:$Dm),
                  IIC_fpALU64, "vadd", ".f64\t$Dd, $Dn, $Dm",
                  [(set DPR:$Dd, (fadd DPR:$Dn, (f64 DPR:$Dm)))]>;

def VADDS  : ASbIn<0b11100, 0b11, 0, 0,
                   (outs SPR:$Sd), (ins SPR:$Sn, SPR:$Sm),
                   IIC_fpALU32, "vadd", ".f32\t$Sd, $Sn, $Sm",
                   [(set SPR:$Sd, (fadd SPR:$Sn, SPR:$Sm))]>;

def VSUBD  : ADbI<0b11100, 0b11, 1, 0,
                  (outs DPR:$Dd), (ins DPR:$Dn, DPR:$Dm),
                  IIC_fpALU64, "vsub", ".f64\t$Dd, $Dn, $Dm",
                  [(set DPR:$Dd, (fsub DPR:$Dn, (f64 DPR:$Dm)))]>;

def VSUBS  : ASbIn<0b11100, 0b11, 1, 0,
                   (outs SPR:$Sd), (ins SPR:$Sn, SPR:$Sm),
                   IIC_fpALU32, "vsub", ".f32\t$Sd, $Sn, $Sm",
                   [(set SPR:$Sd, (fsub SPR:$Sn, SPR:$Sm))]>;

def VDIVD  : ADbI<0b11101, 0b00, 0, 0,
                  (outs DPR:$Dd), (ins DPR:$Dn, DPR:$Dm),
                  IIC_fpDIV64, "vdiv", ".f64\t$Dd, $Dn, $Dm",
                  [(set DPR:$Dd, (fdiv DPR:$Dn, (f64 DPR:$Dm)))]>;

def VDIVS  : ASbI<0b11101, 0b00, 0, 0,
                  (outs SPR:$Sd), (ins SPR:$Sn, SPR:$Sm),
                  IIC_fpDIV32, "vdiv", ".f32\t$Sd, $Sn, $Sm",
                  [(set SPR:$Sd, (fdiv SPR:$Sn, SPR:$Sm))]>;

def VMULD  : ADbI<0b11100, 0b10, 0, 0,
                  (outs DPR:$Dd), (ins DPR:$Dn, DPR:$Dm),
                  IIC_fpMUL64, "vmul", ".f64\t$Dd, $Dn, $Dm",
                  [(set DPR:$Dd, (fmul DPR:$Dn, (f64 DPR:$Dm)))]>;

def VMULS  : ASbIn<0b11100, 0b10, 0, 0,
                   (outs SPR:$Sd), (ins SPR:$Sn, SPR:$Sm),
                   IIC_fpMUL32, "vmul", ".f32\t$Sd, $Sn, $Sm",
                   [(set SPR:$Sd, (fmul SPR:$Sn, SPR:$Sm))]>;

def VNMULD : ADbI<0b11100, 0b10, 1, 0,
                  (outs DPR:$Dd), (ins DPR:$Dn, DPR:$Dm),
                  IIC_fpMUL64, "vnmul", ".f64\t$Dd, $Dn, $Dm",
                  [(set DPR:$Dd, (fneg (fmul DPR:$Dn, (f64 DPR:$Dm))))]>;

def VNMULS : ASbI<0b11100, 0b10, 1, 0,
                  (outs SPR:$Sd), (ins SPR:$Sn, SPR:$Sm),
                  IIC_fpMUL32, "vnmul", ".f32\t$Sd, $Sn, $Sm",
                  [(set SPR:$Sd, (fneg (fmul SPR:$Sn, SPR:$Sm)))]>;

// Match reassociated forms only if not sign dependent rounding.
def : Pat<(fmul (fneg DPR:$a), (f64 DPR:$b)),
          (VNMULD DPR:$a, DPR:$b)>, Requires<[NoHonorSignDependentRounding]>;
def : Pat<(fmul (fneg SPR:$a), SPR:$b),
          (VNMULS SPR:$a, SPR:$b)>, Requires<[NoHonorSignDependentRounding]>;

// These are encoded as unary instructions.
let Defs = [FPSCR] in {
def VCMPED : ADuI<0b11101, 0b11, 0b0100, 0b11, 0,
                  (outs), (ins DPR:$Dd, DPR:$Dm),
                  IIC_fpCMP64, "vcmpe", ".f64\t$Dd, $Dm",
                  [(arm_cmpfp DPR:$Dd, (f64 DPR:$Dm))]>;

def VCMPES : ASuI<0b11101, 0b11, 0b0100, 0b11, 0,
                  (outs), (ins SPR:$Sd, SPR:$Sm),
                  IIC_fpCMP32, "vcmpe", ".f32\t$Sd, $Sm",
                  [(arm_cmpfp SPR:$Sd, SPR:$Sm)]>;

// FIXME: Verify encoding after integrated assembler is working.
def VCMPD  : ADuI<0b11101, 0b11, 0b0100, 0b01, 0,
                  (outs), (ins DPR:$Dd, DPR:$Dm),
                  IIC_fpCMP64, "vcmp", ".f64\t$Dd, $Dm",
                  [/* For disassembly only; pattern left blank */]>;

def VCMPS  : ASuI<0b11101, 0b11, 0b0100, 0b01, 0,
                  (outs), (ins SPR:$Sd, SPR:$Sm),
                  IIC_fpCMP32, "vcmp", ".f32\t$Sd, $Sm",
                  [/* For disassembly only; pattern left blank */]>;
}

//===----------------------------------------------------------------------===//
// FP Unary Operations.
//

def VABSD  : ADuI<0b11101, 0b11, 0b0000, 0b11, 0,
                  (outs DPR:$Dd), (ins DPR:$Dm),
                  IIC_fpUNA64, "vabs", ".f64\t$Dd, $Dm",
                  [(set DPR:$Dd, (fabs (f64 DPR:$Dm)))]>;

def VABSS  : ASuIn<0b11101, 0b11, 0b0000, 0b11, 0,
                   (outs SPR:$Sd), (ins SPR:$Sm),
                   IIC_fpUNA32, "vabs", ".f32\t$Sd, $Sm",
                   [(set SPR:$Sd, (fabs SPR:$Sm))]>;

let Defs = [FPSCR] in {
def VCMPEZD : ADuI<0b11101, 0b11, 0b0101, 0b11, 0,
                   (outs), (ins DPR:$Dd),
                   IIC_fpCMP64, "vcmpe", ".f64\t$Dd, #0",
                   [(arm_cmpfp0 (f64 DPR:$Dd))]> {
  let Inst{3-0} = 0b0000;
  let Inst{5}   = 0;
}

def VCMPEZS : ASuI<0b11101, 0b11, 0b0101, 0b11, 0,
                   (outs), (ins SPR:$Sd),
                   IIC_fpCMP32, "vcmpe", ".f32\t$Sd, #0",
                   [(arm_cmpfp0 SPR:$Sd)]> {
  let Inst{3-0} = 0b0000;
  let Inst{5}   = 0;
}

// FIXME: Verify encoding after integrated assembler is working.
def VCMPZD  : ADuI<0b11101, 0b11, 0b0101, 0b01, 0,
                   (outs), (ins DPR:$Dd),
                   IIC_fpCMP64, "vcmp", ".f64\t$Dd, #0",
                   [/* For disassembly only; pattern left blank */]> {
  let Inst{3-0} = 0b0000;
  let Inst{5}   = 0;
}

def VCMPZS  : ASuI<0b11101, 0b11, 0b0101, 0b01, 0,
                   (outs), (ins SPR:$Sd),
                   IIC_fpCMP32, "vcmp", ".f32\t$Sd, #0",
                   [/* For disassembly only; pattern left blank */]> {
  let Inst{3-0} = 0b0000;
  let Inst{5}   = 0;
}
}

def VCVTDS  : ASuI<0b11101, 0b11, 0b0111, 0b11, 0,
                   (outs DPR:$Dd), (ins SPR:$Sm),
                   IIC_fpCVTDS, "vcvt", ".f64.f32\t$Dd, $Sm",
                   [(set DPR:$Dd, (fextend SPR:$Sm))]> {
  // Instruction operands.
  bits<5> Dd;
  bits<5> Sm;

  // Encode instruction operands.
  let Inst{3-0}   = Sm{4-1};
  let Inst{5}     = Sm{0};
  let Inst{15-12} = Dd{3-0};
  let Inst{22}    = Dd{4};
}

// Special case encoding: bits 11-8 is 0b1011.
def VCVTSD  : VFPAI<(outs SPR:$Sd), (ins DPR:$Dm), VFPUnaryFrm,
                    IIC_fpCVTSD, "vcvt", ".f32.f64\t$Sd, $Dm",
                    [(set SPR:$Sd, (fround DPR:$Dm))]> {
  // Instruction operands.
  bits<5> Sd;
  bits<5> Dm;

  // Encode instruction operands.
  let Inst{3-0}   = Dm{3-0};
  let Inst{5}     = Dm{4};
  let Inst{15-12} = Sd{4-1};
  let Inst{22}    = Sd{0};

  let Inst{27-23} = 0b11101;
  let Inst{21-16} = 0b110111;
  let Inst{11-8}  = 0b1011;
  let Inst{7-6}   = 0b11;
  let Inst{4}     = 0;
}

// Between half-precision and single-precision.  For disassembly only.

// FIXME: Verify encoding after integrated assembler is working.
def VCVTBSH: ASuI<0b11101, 0b11, 0b0010, 0b01, 0, (outs SPR:$dst), (ins SPR:$a),
                 /* FIXME */ IIC_fpCVTSH, "vcvtb", ".f32.f16\t$dst, $a",
                 [/* For disassembly only; pattern left blank */]>;

def : ARMPat<(f32_to_f16 SPR:$a),
             (i32 (COPY_TO_REGCLASS (VCVTBSH SPR:$a), GPR))>;

def VCVTBHS: ASuI<0b11101, 0b11, 0b0011, 0b01, 0, (outs SPR:$dst), (ins SPR:$a),
                 /* FIXME */ IIC_fpCVTHS, "vcvtb", ".f16.f32\t$dst, $a",
                 [/* For disassembly only; pattern left blank */]>;

def : ARMPat<(f16_to_f32 GPR:$a),
             (VCVTBHS (COPY_TO_REGCLASS GPR:$a, SPR))>;

def VCVTTSH: ASuI<0b11101, 0b11, 0b0010, 0b11, 0, (outs SPR:$dst), (ins SPR:$a),
                 /* FIXME */ IIC_fpCVTSH, "vcvtt", ".f32.f16\t$dst, $a",
                 [/* For disassembly only; pattern left blank */]>;

def VCVTTHS: ASuI<0b11101, 0b11, 0b0011, 0b11, 0, (outs SPR:$dst), (ins SPR:$a),
                 /* FIXME */ IIC_fpCVTHS, "vcvtt", ".f16.f32\t$dst, $a",
                 [/* For disassembly only; pattern left blank */]>;

def VNEGD  : ADuI<0b11101, 0b11, 0b0001, 0b01, 0,
                  (outs DPR:$Dd), (ins DPR:$Dm),
                  IIC_fpUNA64, "vneg", ".f64\t$Dd, $Dm",
                  [(set DPR:$Dd, (fneg (f64 DPR:$Dm)))]>;

def VNEGS  : ASuIn<0b11101, 0b11, 0b0001, 0b01, 0,
                   (outs SPR:$Sd), (ins SPR:$Sm),
                   IIC_fpUNA32, "vneg", ".f32\t$Sd, $Sm",
                   [(set SPR:$Sd, (fneg SPR:$Sm))]>;

def VSQRTD : ADuI<0b11101, 0b11, 0b0001, 0b11, 0,
                  (outs DPR:$Dd), (ins DPR:$Dm),
                  IIC_fpSQRT64, "vsqrt", ".f64\t$Dd, $Dm",
                  [(set DPR:$Dd, (fsqrt (f64 DPR:$Dm)))]>;

def VSQRTS : ASuI<0b11101, 0b11, 0b0001, 0b11, 0,
                  (outs SPR:$Sd), (ins SPR:$Sm),
                  IIC_fpSQRT32, "vsqrt", ".f32\t$Sd, $Sm",
                  [(set SPR:$Sd, (fsqrt SPR:$Sm))]>;

let neverHasSideEffects = 1 in {
def VMOVD  : ADuI<0b11101, 0b11, 0b0000, 0b01, 0,
                  (outs DPR:$Dd), (ins DPR:$Dm),
                  IIC_fpUNA64, "vmov", ".f64\t$Dd, $Dm", []>;

def VMOVS  : ASuI<0b11101, 0b11, 0b0000, 0b01, 0,
                  (outs SPR:$Sd), (ins SPR:$Sm),
                  IIC_fpUNA32, "vmov", ".f32\t$Sd, $Sm", []>;
} // neverHasSideEffects

//===----------------------------------------------------------------------===//
// FP <-> GPR Copies.  Int <-> FP Conversions.
//

def VMOVRS : AVConv2I<0b11100001, 0b1010,
                      (outs GPR:$Rt), (ins SPR:$Sn),
                      IIC_fpMOVSI, "vmov", "\t$Rt, $Sn",
                      [(set GPR:$Rt, (bitconvert SPR:$Sn))]> {
  // Instruction operands.
  bits<4> Rt;
  bits<5> Sn;

  // Encode instruction operands.
  let Inst{19-16} = Sn{4-1};
  let Inst{7}     = Sn{0};
  let Inst{15-12} = Rt;

  let Inst{6-5}   = 0b00;
  let Inst{3-0}   = 0b0000;
}

def VMOVSR : AVConv4I<0b11100000, 0b1010,
                      (outs SPR:$Sn), (ins GPR:$Rt),
                      IIC_fpMOVIS, "vmov", "\t$Sn, $Rt",
                      [(set SPR:$Sn, (bitconvert GPR:$Rt))]> {
  // Instruction operands.
  bits<5> Sn;
  bits<4> Rt;

  // Encode instruction operands.
  let Inst{19-16} = Sn{4-1};
  let Inst{7}     = Sn{0};
  let Inst{15-12} = Rt;

  let Inst{6-5}   = 0b00;
  let Inst{3-0}   = 0b0000;
}

let neverHasSideEffects = 1 in {
def VMOVRRD  : AVConv3I<0b11000101, 0b1011,
                        (outs GPR:$Rt, GPR:$Rt2), (ins DPR:$Dm),
                        IIC_fpMOVDI, "vmov", "\t$Rt, $Rt2, $Dm",
                 [/* FIXME: Can't write pattern for multiple result instr*/]> {
  // Instruction operands.
  bits<5> Dm;
  bits<4> Rt;
  bits<4> Rt2;

  // Encode instruction operands.
  let Inst{3-0}   = Dm{3-0};
  let Inst{5}     = Dm{4};
  let Inst{15-12} = Rt;
  let Inst{19-16} = Rt2;

  let Inst{7-6} = 0b00;
}

def VMOVRRS  : AVConv3I<0b11000101, 0b1010,
                      (outs GPR:$wb, GPR:$dst2), (ins SPR:$src1, SPR:$src2),
                 IIC_fpMOVDI, "vmov", "\t$wb, $dst2, $src1, $src2",
                 [/* For disassembly only; pattern left blank */]> {
  let Inst{7-6} = 0b00;
}
} // neverHasSideEffects

// FMDHR: GPR -> SPR
// FMDLR: GPR -> SPR

def VMOVDRR : AVConv5I<0b11000100, 0b1011,
                      (outs DPR:$Dm), (ins GPR:$Rt, GPR:$Rt2),
                      IIC_fpMOVID, "vmov", "\t$Dm, $Rt, $Rt2",
                      [(set DPR:$Dm, (arm_fmdrr GPR:$Rt, GPR:$Rt2))]> {
  // Instruction operands.
  bits<5> Dm;
  bits<4> Rt;
  bits<4> Rt2;

  // Encode instruction operands.
  let Inst{3-0}   = Dm{3-0};
  let Inst{5}     = Dm{4};
  let Inst{15-12} = Rt;
  let Inst{19-16} = Rt2;

  let Inst{7-6}   = 0b00;
}

let neverHasSideEffects = 1 in
def VMOVSRR : AVConv5I<0b11000100, 0b1010,
                     (outs SPR:$dst1, SPR:$dst2), (ins GPR:$src1, GPR:$src2),
                IIC_fpMOVID, "vmov", "\t$dst1, $dst2, $src1, $src2",
                [/* For disassembly only; pattern left blank */]> {
  let Inst{7-6} = 0b00;
}

// FMRDH: SPR -> GPR
// FMRDL: SPR -> GPR
// FMRRS: SPR -> GPR
// FMRX:  SPR system reg -> GPR
// FMSRR: GPR -> SPR
// FMXR:  GPR -> VFP system reg


// Int -> FP:

class AVConv1IDs_Encode<bits<5> opcod1, bits<2> opcod2, bits<4> opcod3,
                        bits<4> opcod4, dag oops, dag iops,
                        InstrItinClass itin, string opc, string asm,
                        list<dag> pattern>
  : AVConv1I<opcod1, opcod2, opcod3, opcod4, oops, iops, itin, opc, asm,
             pattern> {
  // Instruction operands.
  bits<5> Dd;
  bits<5> Sm;

  // Encode instruction operands.
  let Inst{3-0}   = Sm{4-1};
  let Inst{5}     = Sm{0};
  let Inst{15-12} = Dd{3-0};
  let Inst{22}    = Dd{4};
}

class AVConv1InSs_Encode<bits<5> opcod1, bits<2> opcod2, bits<4> opcod3,
                         bits<4> opcod4, dag oops, dag iops,InstrItinClass itin,
                         string opc, string asm, list<dag> pattern>
  : AVConv1In<opcod1, opcod2, opcod3, opcod4, oops, iops, itin, opc, asm,
              pattern> {
  // Instruction operands.
  bits<5> Sd;
  bits<5> Sm;

  // Encode instruction operands.
  let Inst{3-0}   = Sm{4-1};
  let Inst{5}     = Sm{0};
  let Inst{15-12} = Sd{4-1};
  let Inst{22}    = Sd{0};
}

def VSITOD : AVConv1IDs_Encode<0b11101, 0b11, 0b1000, 0b1011,
                               (outs DPR:$Dd), (ins SPR:$Sm),
                               IIC_fpCVTID, "vcvt", ".f64.s32\t$Dd, $Sm",
                               [(set DPR:$Dd, (f64 (arm_sitof SPR:$Sm)))]> {
  let Inst{7} = 1; // s32
}

def VSITOS : AVConv1InSs_Encode<0b11101, 0b11, 0b1000, 0b1010,
                                (outs SPR:$Sd),(ins SPR:$Sm),
                                IIC_fpCVTIS, "vcvt", ".f32.s32\t$Sd, $Sm",
                                [(set SPR:$Sd, (arm_sitof SPR:$Sm))]> {
  let Inst{7} = 1; // s32
}

def VUITOD : AVConv1IDs_Encode<0b11101, 0b11, 0b1000, 0b1011,
                               (outs DPR:$Dd), (ins SPR:$Sm),
                               IIC_fpCVTID, "vcvt", ".f64.u32\t$Dd, $Sm",
                               [(set DPR:$Dd, (f64 (arm_uitof SPR:$Sm)))]> {
  let Inst{7} = 0; // u32
}

def VUITOS : AVConv1InSs_Encode<0b11101, 0b11, 0b1000, 0b1010,
                                (outs SPR:$Sd), (ins SPR:$Sm),
                                IIC_fpCVTIS, "vcvt", ".f32.u32\t$Sd, $Sm",
                                [(set SPR:$Sd, (arm_uitof SPR:$Sm))]> {
  let Inst{7} = 0; // u32
}

// FP -> Int:

class AVConv1IsD_Encode<bits<5> opcod1, bits<2> opcod2, bits<4> opcod3,
                        bits<4> opcod4, dag oops, dag iops,
                        InstrItinClass itin, string opc, string asm,
                        list<dag> pattern>
  : AVConv1I<opcod1, opcod2, opcod3, opcod4, oops, iops, itin, opc, asm,
             pattern> {
  // Instruction operands.
  bits<5> Sd;
  bits<5> Dm;

  // Encode instruction operands.
  let Inst{3-0}   = Dm{3-0};
  let Inst{5}     = Dm{4};
  let Inst{15-12} = Sd{4-1};
  let Inst{22}    = Sd{0};
}

class AVConv1InsS_Encode<bits<5> opcod1, bits<2> opcod2, bits<4> opcod3,
                         bits<4> opcod4, dag oops, dag iops,
                         InstrItinClass itin, string opc, string asm,
                         list<dag> pattern>
  : AVConv1In<opcod1, opcod2, opcod3, opcod4, oops, iops, itin, opc, asm,
              pattern> {
  // Instruction operands.
  bits<5> Sd;
  bits<5> Sm;

  // Encode instruction operands.
  let Inst{3-0}   = Sm{4-1};
  let Inst{5}     = Sm{0};
  let Inst{15-12} = Sd{4-1};
  let Inst{22}    = Sd{0};
}

// Always set Z bit in the instruction, i.e. "round towards zero" variants.
def VTOSIZD : AVConv1IsD_Encode<0b11101, 0b11, 0b1101, 0b1011,
                                (outs SPR:$Sd), (ins DPR:$Dm),
                                IIC_fpCVTDI, "vcvt", ".s32.f64\t$Sd, $Dm",
                                [(set SPR:$Sd, (arm_ftosi (f64 DPR:$Dm)))]> {
  let Inst{7} = 1; // Z bit
}

def VTOSIZS : AVConv1InsS_Encode<0b11101, 0b11, 0b1101, 0b1010,
                                 (outs SPR:$Sd), (ins SPR:$Sm),
                                 IIC_fpCVTSI, "vcvt", ".s32.f32\t$Sd, $Sm",
                                 [(set SPR:$Sd, (arm_ftosi SPR:$Sm))]> {
  let Inst{7} = 1; // Z bit
}

def VTOUIZD : AVConv1IsD_Encode<0b11101, 0b11, 0b1100, 0b1011,
                               (outs SPR:$Sd), (ins DPR:$Dm),
                               IIC_fpCVTDI, "vcvt", ".u32.f64\t$Sd, $Dm",
                               [(set SPR:$Sd, (arm_ftoui (f64 DPR:$Dm)))]> {
  let Inst{7} = 1; // Z bit
}

def VTOUIZS : AVConv1InsS_Encode<0b11101, 0b11, 0b1100, 0b1010,
                                 (outs SPR:$Sd), (ins SPR:$Sm),
                                 IIC_fpCVTSI, "vcvt", ".u32.f32\t$Sd, $Sm",
                                 [(set SPR:$Sd, (arm_ftoui SPR:$Sm))]> {
  let Inst{7} = 1; // Z bit
}

// And the Z bit '0' variants, i.e. use the rounding mode specified by FPSCR.
// For disassembly only.
let Uses = [FPSCR] in {
// FIXME: Verify encoding after integrated assembler is working.
def VTOSIRD : AVConv1IsD_Encode<0b11101, 0b11, 0b1101, 0b1011,
                                (outs SPR:$Sd), (ins DPR:$Dm),
                                IIC_fpCVTDI, "vcvtr", ".s32.f64\t$Sd, $Dm",
                                [(set SPR:$Sd, (int_arm_vcvtr (f64 DPR:$Dm)))]>{
  let Inst{7} = 0; // Z bit
}

def VTOSIRS : AVConv1InsS_Encode<0b11101, 0b11, 0b1101, 0b1010,
                                 (outs SPR:$Sd), (ins SPR:$Sm),
                                 IIC_fpCVTSI, "vcvtr", ".s32.f32\t$Sd, $Sm",
                                 [(set SPR:$Sd, (int_arm_vcvtr SPR:$Sm))]> {
  let Inst{7} = 0; // Z bit
}

def VTOUIRD : AVConv1IsD_Encode<0b11101, 0b11, 0b1100, 0b1011,
                                (outs SPR:$Sd), (ins DPR:$Dm),
                                IIC_fpCVTDI, "vcvtr", ".u32.f64\t$Sd, $Dm",
                                [(set SPR:$Sd, (int_arm_vcvtru(f64 DPR:$Dm)))]>{
  let Inst{7} = 0; // Z bit
}

def VTOUIRS : AVConv1InsS_Encode<0b11101, 0b11, 0b1100, 0b1010,
                                 (outs SPR:$Sd), (ins SPR:$Sm),
                                 IIC_fpCVTSI, "vcvtr", ".u32.f32\t$Sd, $Sm",
                                 [(set SPR:$Sd, (int_arm_vcvtru SPR:$Sm))]> {
  let Inst{7} = 0; // Z bit
}
}

// Convert between floating-point and fixed-point
// Data type for fixed-point naming convention:
//   S16 (U=0, sx=0) -> SH
//   U16 (U=1, sx=0) -> UH
//   S32 (U=0, sx=1) -> SL
//   U32 (U=1, sx=1) -> UL

// FIXME: Marking these as codegen only seems wrong. They are real
//        instructions(?)
let Constraints = "$a = $dst", isCodeGenOnly = 1 in {

// FP to Fixed-Point:

def VTOSHS : AVConv1XI<0b11101, 0b11, 0b1110, 0b1010, 0,
                       (outs SPR:$dst), (ins SPR:$a, i32imm:$fbits),
                 IIC_fpCVTSI, "vcvt", ".s16.f32\t$dst, $a, $fbits",
                 [/* For disassembly only; pattern left blank */]>;

def VTOUHS : AVConv1XI<0b11101, 0b11, 0b1111, 0b1010, 0,
                       (outs SPR:$dst), (ins SPR:$a, i32imm:$fbits),
                 IIC_fpCVTSI, "vcvt", ".u16.f32\t$dst, $a, $fbits",
                 [/* For disassembly only; pattern left blank */]>;

def VTOSLS : AVConv1XI<0b11101, 0b11, 0b1110, 0b1010, 1,
                       (outs SPR:$dst), (ins SPR:$a, i32imm:$fbits),
                 IIC_fpCVTSI, "vcvt", ".s32.f32\t$dst, $a, $fbits",
                 [/* For disassembly only; pattern left blank */]>;

def VTOULS : AVConv1XI<0b11101, 0b11, 0b1111, 0b1010, 1,
                       (outs SPR:$dst), (ins SPR:$a, i32imm:$fbits),
                 IIC_fpCVTSI, "vcvt", ".u32.f32\t$dst, $a, $fbits",
                 [/* For disassembly only; pattern left blank */]>;

def VTOSHD : AVConv1XI<0b11101, 0b11, 0b1110, 0b1011, 0,
                       (outs DPR:$dst), (ins DPR:$a, i32imm:$fbits),
                 IIC_fpCVTDI, "vcvt", ".s16.f64\t$dst, $a, $fbits",
                 [/* For disassembly only; pattern left blank */]>;

def VTOUHD : AVConv1XI<0b11101, 0b11, 0b1111, 0b1011, 0,
                       (outs DPR:$dst), (ins DPR:$a, i32imm:$fbits),
                 IIC_fpCVTDI, "vcvt", ".u16.f64\t$dst, $a, $fbits",
                 [/* For disassembly only; pattern left blank */]>;

def VTOSLD : AVConv1XI<0b11101, 0b11, 0b1110, 0b1011, 1,
                       (outs DPR:$dst), (ins DPR:$a, i32imm:$fbits),
                 IIC_fpCVTDI, "vcvt", ".s32.f64\t$dst, $a, $fbits",
                 [/* For disassembly only; pattern left blank */]>;

def VTOULD : AVConv1XI<0b11101, 0b11, 0b1111, 0b1011, 1,
                       (outs DPR:$dst), (ins DPR:$a, i32imm:$fbits),
                 IIC_fpCVTDI, "vcvt", ".u32.f64\t$dst, $a, $fbits",
                 [/* For disassembly only; pattern left blank */]>;

// Fixed-Point to FP:

def VSHTOS : AVConv1XI<0b11101, 0b11, 0b1010, 0b1010, 0,
                       (outs SPR:$dst), (ins SPR:$a, i32imm:$fbits),
                 IIC_fpCVTIS, "vcvt", ".f32.s16\t$dst, $a, $fbits",
                 [/* For disassembly only; pattern left blank */]>;

def VUHTOS : AVConv1XI<0b11101, 0b11, 0b1011, 0b1010, 0,
                       (outs SPR:$dst), (ins SPR:$a, i32imm:$fbits),
                 IIC_fpCVTIS, "vcvt", ".f32.u16\t$dst, $a, $fbits",
                 [/* For disassembly only; pattern left blank */]>;

def VSLTOS : AVConv1XI<0b11101, 0b11, 0b1010, 0b1010, 1,
                       (outs SPR:$dst), (ins SPR:$a, i32imm:$fbits),
                 IIC_fpCVTIS, "vcvt", ".f32.s32\t$dst, $a, $fbits",
                 [/* For disassembly only; pattern left blank */]>;

def VULTOS : AVConv1XI<0b11101, 0b11, 0b1011, 0b1010, 1,
                       (outs SPR:$dst), (ins SPR:$a, i32imm:$fbits),
                 IIC_fpCVTIS, "vcvt", ".f32.u32\t$dst, $a, $fbits",
                 [/* For disassembly only; pattern left blank */]>;

def VSHTOD : AVConv1XI<0b11101, 0b11, 0b1010, 0b1011, 0,
                       (outs DPR:$dst), (ins DPR:$a, i32imm:$fbits),
                 IIC_fpCVTID, "vcvt", ".f64.s16\t$dst, $a, $fbits",
                 [/* For disassembly only; pattern left blank */]>;

def VUHTOD : AVConv1XI<0b11101, 0b11, 0b1011, 0b1011, 0,
                       (outs DPR:$dst), (ins DPR:$a, i32imm:$fbits),
                 IIC_fpCVTID, "vcvt", ".f64.u16\t$dst, $a, $fbits",
                 [/* For disassembly only; pattern left blank */]>;

def VSLTOD : AVConv1XI<0b11101, 0b11, 0b1010, 0b1011, 1,
                       (outs DPR:$dst), (ins DPR:$a, i32imm:$fbits),
                 IIC_fpCVTID, "vcvt", ".f64.s32\t$dst, $a, $fbits",
                 [/* For disassembly only; pattern left blank */]>;

def VULTOD : AVConv1XI<0b11101, 0b11, 0b1011, 0b1011, 1,
                       (outs DPR:$dst), (ins DPR:$a, i32imm:$fbits),
                 IIC_fpCVTID, "vcvt", ".f64.u32\t$dst, $a, $fbits",
                 [/* For disassembly only; pattern left blank */]>;

} // End of 'let Constraints = "$a = $dst", isCodeGenOnly = 1 in'

//===----------------------------------------------------------------------===//
// FP FMA Operations.
//

def VMLAD : ADbI_vmlX<0b11100, 0b00, 0, 0,
                      (outs DPR:$Dd), (ins DPR:$Ddin, DPR:$Dn, DPR:$Dm),
                      IIC_fpMAC64, "vmla", ".f64\t$Dd, $Dn, $Dm",
                      [(set DPR:$Dd, (fadd (fmul DPR:$Dn, DPR:$Dm),
                                           (f64 DPR:$Ddin)))]>,
              RegConstraint<"$Ddin = $Dd">;

def VMLAS : ASbIn<0b11100, 0b00, 0, 0,
                  (outs SPR:$Sd), (ins SPR:$Sdin, SPR:$Sn, SPR:$Sm),
                  IIC_fpMAC32, "vmla", ".f32\t$Sd, $Sn, $Sm",
                  [(set SPR:$Sd, (fadd (fmul SPR:$Sn, SPR:$Sm),
                                       SPR:$Sdin))]>,
              RegConstraint<"$Sdin = $Sd">;

def : Pat<(fadd DPR:$dstin, (fmul DPR:$a, (f64 DPR:$b))),
          (VMLAD DPR:$dstin, DPR:$a, DPR:$b)>, Requires<[DontUseNEONForFP]>;
def : Pat<(fadd SPR:$dstin, (fmul SPR:$a, SPR:$b)),
          (VMLAS SPR:$dstin, SPR:$a, SPR:$b)>, Requires<[DontUseNEONForFP]>;

def VMLSD : ADbI_vmlX<0b11100, 0b00, 1, 0,
                      (outs DPR:$Dd), (ins DPR:$Ddin, DPR:$Dn, DPR:$Dm),
                      IIC_fpMAC64, "vmls", ".f64\t$Dd, $Dn, $Dm",
                      [(set DPR:$Dd, (fadd (fneg (fmul DPR:$Dn,DPR:$Dm)),
                                                 (f64 DPR:$Ddin)))]>,
              RegConstraint<"$Ddin = $Dd">;

def VMLSS : ASbIn<0b11100, 0b00, 1, 0,
                  (outs SPR:$Sd), (ins SPR:$Sdin, SPR:$Sn, SPR:$Sm),
                  IIC_fpMAC32, "vmls", ".f32\t$Sd, $Sn, $Sm",
                  [(set SPR:$Sd, (fadd (fneg (fmul SPR:$Sn, SPR:$Sm)),
                                       SPR:$Sdin))]>,
              RegConstraint<"$Sdin = $Sd">;

def : Pat<(fsub DPR:$dstin, (fmul DPR:$a, (f64 DPR:$b))),
          (VMLSD DPR:$dstin, DPR:$a, DPR:$b)>, Requires<[DontUseNEONForFP]>;
def : Pat<(fsub SPR:$dstin, (fmul SPR:$a, SPR:$b)),
          (VMLSS SPR:$dstin, SPR:$a, SPR:$b)>, Requires<[DontUseNEONForFP]>;

def VNMLAD : ADbI_vmlX<0b11100, 0b01, 1, 0,
                       (outs DPR:$Dd), (ins DPR:$Ddin, DPR:$Dn, DPR:$Dm),
                       IIC_fpMAC64, "vnmla", ".f64\t$Dd, $Dn, $Dm",
                       [(set DPR:$Dd,(fsub (fneg (fmul DPR:$Dn,DPR:$Dm)),
                                           (f64 DPR:$Ddin)))]>,
                RegConstraint<"$Ddin = $Dd">;

def VNMLAS : ASbI<0b11100, 0b01, 1, 0,
                  (outs SPR:$Sd), (ins SPR:$Sdin, SPR:$Sn, SPR:$Sm),
                  IIC_fpMAC32, "vnmla", ".f32\t$Sd, $Sn, $Sm",
                  [(set SPR:$Sd, (fsub (fneg (fmul SPR:$Sn, SPR:$Sm)),
                                       SPR:$Sdin))]>,
                RegConstraint<"$Sdin = $Sd">;

def : Pat<(fsub (fneg (fmul DPR:$a, (f64 DPR:$b))), DPR:$dstin),
          (VNMLAD DPR:$dstin, DPR:$a, DPR:$b)>, Requires<[DontUseNEONForFP]>;
def : Pat<(fsub (fneg (fmul SPR:$a, SPR:$b)), SPR:$dstin),
          (VNMLAS SPR:$dstin, SPR:$a, SPR:$b)>, Requires<[DontUseNEONForFP]>;

def VNMLSD : ADbI_vmlX<0b11100, 0b01, 0, 0,
                       (outs DPR:$Dd), (ins DPR:$Ddin, DPR:$Dn, DPR:$Dm),
                       IIC_fpMAC64, "vnmls", ".f64\t$Dd, $Dn, $Dm",
                       [(set DPR:$Dd, (fsub (fmul DPR:$Dn, DPR:$Dm),
                                            (f64 DPR:$Ddin)))]>,
               RegConstraint<"$Ddin = $Dd">;

def VNMLSS : ASbI<0b11100, 0b01, 0, 0,
                  (outs SPR:$Sd), (ins SPR:$Sdin, SPR:$Sn, SPR:$Sm),
                  IIC_fpMAC32, "vnmls", ".f32\t$Sd, $Sn, $Sm",
                  [(set SPR:$Sd, (fsub (fmul SPR:$Sn, SPR:$Sm), SPR:$Sdin))]>,
                         RegConstraint<"$Sdin = $Sd">;

def : Pat<(fsub (fmul DPR:$a, (f64 DPR:$b)), DPR:$dstin),
          (VNMLSD DPR:$dstin, DPR:$a, DPR:$b)>, Requires<[DontUseNEONForFP]>;
def : Pat<(fsub (fmul SPR:$a, SPR:$b), SPR:$dstin),
          (VNMLSS SPR:$dstin, SPR:$a, SPR:$b)>, Requires<[DontUseNEONForFP]>;


//===----------------------------------------------------------------------===//
// FP Conditional moves.
//

let neverHasSideEffects = 1 in {
def VMOVDcc  : ADuI<0b11101, 0b11, 0b0000, 0b01, 0,
                    (outs DPR:$Dd), (ins DPR:$Dn, DPR:$Dm),
                    IIC_fpUNA64, "vmov", ".f64\t$Dd, $Dm",
                    [/*(set DPR:$Dd, (ARMcmov DPR:$Dn, DPR:$Dm, imm:$cc))*/]>,
                 RegConstraint<"$Dn = $Dd">;

def VMOVScc  : ASuI<0b11101, 0b11, 0b0000, 0b01, 0,
                    (outs SPR:$Sd), (ins SPR:$Sn, SPR:$Sm),
                    IIC_fpUNA32, "vmov", ".f32\t$Sd, $Sm",
                    [/*(set SPR:$Sd, (ARMcmov SPR:$Sn, SPR:$Sm, imm:$cc))*/]>,
                 RegConstraint<"$Sn = $Sd">;

def VNEGDcc  : ADuI<0b11101, 0b11, 0b0001, 0b01, 0,
                    (outs DPR:$Dd), (ins DPR:$Dn, DPR:$Dm),
                    IIC_fpUNA64, "vneg", ".f64\t$Dd, $Dm",
                    [/*(set DPR:$Dd, (ARMcneg DPR:$Dn, DPR:$Dm, imm:$cc))*/]>,
                 RegConstraint<"$Dn = $Dd">;

def VNEGScc  : ASuI<0b11101, 0b11, 0b0001, 0b01, 0,
                    (outs SPR:$Sd), (ins SPR:$Sn, SPR:$Sm),
                    IIC_fpUNA32, "vneg", ".f32\t$Sd, $Sm",
                    [/*(set SPR:$Sd, (ARMcneg SPR:$Sn, SPR:$Sm, imm:$cc))*/]>,
                 RegConstraint<"$Sn = $Sd">;
} // neverHasSideEffects

//===----------------------------------------------------------------------===//
// Misc.
//

// APSR is the application level alias of CPSR. This FPSCR N, Z, C, V flags
// to APSR.
let Defs = [CPSR], Uses = [FPSCR] in
def FMSTAT : VFPAI<(outs), (ins), VFPMiscFrm, IIC_fpSTAT,
                   "vmrs", "\tapsr_nzcv, fpscr",
                   [(arm_fmstat)]> {
  let Inst{27-20} = 0b11101111;
  let Inst{19-16} = 0b0001;
  let Inst{15-12} = 0b1111;
  let Inst{11-8}  = 0b1010;
  let Inst{7}     = 0;
  let Inst{6-5}   = 0b00;
  let Inst{4}     = 1;
  let Inst{3-0}   = 0b0000;
}

// FPSCR <-> GPR
let hasSideEffects = 1, Uses = [FPSCR] in
def VMRS : VFPAI<(outs GPR:$Rt), (ins), VFPMiscFrm, IIC_fpSTAT,
                 "vmrs", "\t$Rt, fpscr",
                 [(set GPR:$Rt, (int_arm_get_fpscr))]> {
  // Instruction operand.
  bits<4> Rt;

  // Encode instruction operand.
  let Inst{15-12} = Rt;

  let Inst{27-20} = 0b11101111;
  let Inst{19-16} = 0b0001;
  let Inst{11-8}  = 0b1010;
  let Inst{7}     = 0;
  let Inst{6-5}   = 0b00;
  let Inst{4}     = 1;
  let Inst{3-0}   = 0b0000;
}

let Defs = [FPSCR] in 
def VMSR : VFPAI<(outs), (ins GPR:$src), VFPMiscFrm, IIC_fpSTAT, 
                 "vmsr", "\tfpscr, $src",
                 [(int_arm_set_fpscr GPR:$src)]> {
  // Instruction operand.
  bits<4> src;

  // Encode instruction operand.
  let Inst{15-12} = src;

  let Inst{27-20} = 0b11101110;
  let Inst{19-16} = 0b0001;
  let Inst{11-8}  = 0b1010;
  let Inst{7}     = 0;
  let Inst{4}     = 1;
}

// Materialize FP immediates. VFP3 only.
let isReMaterializable = 1 in {
def FCONSTD : VFPAI<(outs DPR:$Dd), (ins vfp_f64imm:$imm),
                    VFPMiscFrm, IIC_fpUNA64,
                    "vmov", ".f64\t$Dd, $imm",
                    [(set DPR:$Dd, vfp_f64imm:$imm)]>, Requires<[HasVFP3]> {
  // Instruction operands.
  bits<5>  Dd;
  bits<32> imm;

  // Encode instruction operands.
  let Inst{15-12} = Dd{3-0};
  let Inst{22}    = Dd{4};
  let Inst{19}    = imm{31};
  let Inst{18-16} = imm{22-20};
  let Inst{3-0}   = imm{19-16};

  // Encode remaining instruction bits.
  let Inst{27-23} = 0b11101;
  let Inst{21-20} = 0b11;
  let Inst{11-9}  = 0b101;
  let Inst{8}     = 1;          // Double precision.
  let Inst{7-4}   = 0b0000;
}

def FCONSTS : VFPAI<(outs SPR:$Sd), (ins vfp_f32imm:$imm),
                     VFPMiscFrm, IIC_fpUNA32,
                     "vmov", ".f32\t$Sd, $imm",
                     [(set SPR:$Sd, vfp_f32imm:$imm)]>, Requires<[HasVFP3]> {
  // Instruction operands.
  bits<5>  Sd;
  bits<32> imm;

  // Encode instruction operands.
  let Inst{15-12} = Sd{4-1};
  let Inst{22}    = Sd{0};
  let Inst{19}    = imm{31};    // The immediate is handled as a double.
  let Inst{18-16} = imm{22-20};
  let Inst{3-0}   = imm{19-16};

  // Encode remaining instruction bits.
  let Inst{27-23} = 0b11101;
  let Inst{21-20} = 0b11;
  let Inst{11-9}  = 0b101;
  let Inst{8}     = 0;          // Single precision.
  let Inst{7-4}   = 0b0000;
}
}