//===-- MipsInstrFormats.td - Mips Instruction Formats -----*- tablegen -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//===----------------------------------------------------------------------===//
// Describe MIPS instructions format
//
// CPU INSTRUCTION FORMATS
//
// opcode - operation code.
// rs - src reg.
// rt - dst reg (on a 2 regs instr) or src reg (on a 3 reg instr).
// rd - dst reg, only used on 3 regs instr.
// shamt - only used on shift instructions, contains the shift amount.
// funct - combined with opcode field give us an operation code.
//
//===----------------------------------------------------------------------===//
// Format specifies the encoding used by the instruction. This is part of the
// ad-hoc solution used to emit machine instruction encodings by our machine
// code emitter.
class Format<bits<4> val> {
bits<4> Value = val;
}
def Pseudo : Format<0>;
def FrmR : Format<1>;
def FrmI : Format<2>;
def FrmJ : Format<3>;
def FrmFR : Format<4>;
def FrmFI : Format<5>;
def FrmOther : Format<6>; // Instruction w/ a custom format
class MMRel;
def Std2MicroMips : InstrMapping {
let FilterClass = "MMRel";
// Instructions with the same BaseOpcode and isNVStore values form a row.
let RowFields = ["BaseOpcode"];
// Instructions with the same predicate sense form a column.
let ColFields = ["Arch"];
// The key column is the unpredicated instructions.
let KeyCol = ["se"];
// Value columns are PredSense=true and PredSense=false
let ValueCols = [["se"], ["micromips"]];
}
class StdMMR6Rel;
def Std2MicroMipsR6 : InstrMapping {
let FilterClass = "StdMMR6Rel";
// Instructions with the same BaseOpcode and isNVStore values form a row.
let RowFields = ["BaseOpcode"];
// Instructions with the same predicate sense form a column.
let ColFields = ["Arch"];
// The key column is the unpredicated instructions.
let KeyCol = ["se"];
// Value columns are PredSense=true and PredSense=false
let ValueCols = [["se"], ["micromipsr6"]];
}
class StdArch {
string Arch = "se";
}
// Generic Mips Format
class MipsInst<dag outs, dag ins, string asmstr, list<dag> pattern,
InstrItinClass itin, Format f>: Instruction, PredicateControl
{
field bits<32> Inst;
Format Form = f;
let Namespace = "Mips";
let Size = 4;
bits<6> Opcode = 0;
// Top 6 bits are the 'opcode' field
let Inst{31-26} = Opcode;
let OutOperandList = outs;
let InOperandList = ins;
let AsmString = asmstr;
let Pattern = pattern;
let Itinerary = itin;
//
// Attributes specific to Mips instructions...
//
bits<4> FormBits = Form.Value;
bit isCTI = 0; // Any form of Control Transfer Instruction.
// Required for MIPSR6
bit hasForbiddenSlot = 0; // Instruction has a forbidden slot.
bit hasFCCRegOperand = 0; // Instruction uses $fcc<X> register and is
// present in MIPS-I to MIPS-III.
// TSFlags layout should be kept in sync with MCTargetDesc/MipsBaseInfo.h.
let TSFlags{3-0} = FormBits;
let TSFlags{4} = isCTI;
let TSFlags{5} = hasForbiddenSlot;
let TSFlags{6} = hasFCCRegOperand;
let DecoderNamespace = "Mips";
field bits<32> SoftFail = 0;
}
// Mips32/64 Instruction Format
class InstSE<dag outs, dag ins, string asmstr, list<dag> pattern,
InstrItinClass itin, Format f, string opstr = ""> :
MipsInst<outs, ins, asmstr, pattern, itin, f> {
let EncodingPredicates = [NotInMips16Mode];
string BaseOpcode = opstr;
string Arch;
}
// Mips Pseudo Instructions Format
class MipsPseudo<dag outs, dag ins, list<dag> pattern,
InstrItinClass itin = IIPseudo> :
MipsInst<outs, ins, "", pattern, itin, Pseudo> {
let isCodeGenOnly = 1;
let isPseudo = 1;
}
// Mips32/64 Pseudo Instruction Format
class PseudoSE<dag outs, dag ins, list<dag> pattern,
InstrItinClass itin = IIPseudo> :
MipsPseudo<outs, ins, pattern, itin> {
let EncodingPredicates = [NotInMips16Mode];
}
// Pseudo-instructions for alternate assembly syntax (never used by codegen).
// These are aliases that require C++ handling to convert to the target
// instruction, while InstAliases can be handled directly by tblgen.
class MipsAsmPseudoInst<dag outs, dag ins, string asmstr>:
MipsInst<outs, ins, asmstr, [], IIPseudo, Pseudo> {
let isPseudo = 1;
let hasNoSchedulingInfo = 1;
let Pattern = [];
}
//===----------------------------------------------------------------------===//
// Format R instruction class in Mips : <|opcode|rs|rt|rd|shamt|funct|>
//===----------------------------------------------------------------------===//
class FR<bits<6> op, bits<6> _funct, dag outs, dag ins, string asmstr,
list<dag> pattern, InstrItinClass itin>:
InstSE<outs, ins, asmstr, pattern, itin, FrmR>
{
bits<5> rd;
bits<5> rs;
bits<5> rt;
bits<5> shamt;
bits<6> funct;
let Opcode = op;
let funct = _funct;
let Inst{25-21} = rs;
let Inst{20-16} = rt;
let Inst{15-11} = rd;
let Inst{10-6} = shamt;
let Inst{5-0} = funct;
}
//===----------------------------------------------------------------------===//
// Format J instruction class in Mips : <|opcode|address|>
//===----------------------------------------------------------------------===//
class FJ<bits<6> op> : StdArch
{
bits<26> target;
bits<32> Inst;
let Inst{31-26} = op;
let Inst{25-0} = target;
}
//===----------------------------------------------------------------------===//
// MFC instruction class in Mips : <|op|mf|rt|rd|gst|0000|sel|>
//===----------------------------------------------------------------------===//
class MFC3OP_FM<bits<6> op, bits<5> mfmt, bits<3> guest> : StdArch {
bits<5> rt;
bits<5> rd;
bits<3> sel;
bits<32> Inst;
let Inst{31-26} = op;
let Inst{25-21} = mfmt;
let Inst{20-16} = rt;
let Inst{15-11} = rd;
let Inst{10-8} = guest;
let Inst{7-3} = 0;
let Inst{2-0} = sel;
}
class MFC2OP_FM<bits<6> op, bits<5> mfmt> : StdArch {
bits<5> rt;
bits<16> imm16;
bits<32> Inst;
let Inst{31-26} = op;
let Inst{25-21} = mfmt;
let Inst{20-16} = rt;
let Inst{15-0} = imm16;
}
class ADD_FM<bits<6> op, bits<6> funct> : StdArch {
bits<5> rd;
bits<5> rs;
bits<5> rt;
bits<32> Inst;
let Inst{31-26} = op;
let Inst{25-21} = rs;
let Inst{20-16} = rt;
let Inst{15-11} = rd;
let Inst{10-6} = 0;
let Inst{5-0} = funct;
}
class ADDI_FM<bits<6> op> : StdArch {
bits<5> rs;
bits<5> rt;
bits<16> imm16;
bits<32> Inst;
let Inst{31-26} = op;
let Inst{25-21} = rs;
let Inst{20-16} = rt;
let Inst{15-0} = imm16;
}
class SRA_FM<bits<6> funct, bit rotate> : StdArch {
bits<5> rd;
bits<5> rt;
bits<5> shamt;
bits<32> Inst;
let Inst{31-26} = 0;
let Inst{25-22} = 0;
let Inst{21} = rotate;
let Inst{20-16} = rt;
let Inst{15-11} = rd;
let Inst{10-6} = shamt;
let Inst{5-0} = funct;
}
class SRLV_FM<bits<6> funct, bit rotate> : StdArch {
bits<5> rd;
bits<5> rt;
bits<5> rs;
bits<32> Inst;
let Inst{31-26} = 0;
let Inst{25-21} = rs;
let Inst{20-16} = rt;
let Inst{15-11} = rd;
let Inst{10-7} = 0;
let Inst{6} = rotate;
let Inst{5-0} = funct;
}
class BEQ_FM<bits<6> op> : StdArch {
bits<5> rs;
bits<5> rt;
bits<16> offset;
bits<32> Inst;
let Inst{31-26} = op;
let Inst{25-21} = rs;
let Inst{20-16} = rt;
let Inst{15-0} = offset;
}
class BGEZ_FM<bits<6> op, bits<5> funct> : StdArch {
bits<5> rs;
bits<16> offset;
bits<32> Inst;
let Inst{31-26} = op;
let Inst{25-21} = rs;
let Inst{20-16} = funct;
let Inst{15-0} = offset;
}
class BBIT_FM<bits<6> op> : StdArch {
bits<5> rs;
bits<5> p;
bits<16> offset;
bits<32> Inst;
let Inst{31-26} = op;
let Inst{25-21} = rs;
let Inst{20-16} = p;
let Inst{15-0} = offset;
}
class SLTI_FM<bits<6> op> : StdArch {
bits<5> rt;
bits<5> rs;
bits<16> imm16;
bits<32> Inst;
let Inst{31-26} = op;
let Inst{25-21} = rs;
let Inst{20-16} = rt;
let Inst{15-0} = imm16;
}
class MFLO_FM<bits<6> funct> : StdArch {
bits<5> rd;
bits<32> Inst;
let Inst{31-26} = 0;
let Inst{25-16} = 0;
let Inst{15-11} = rd;
let Inst{10-6} = 0;
let Inst{5-0} = funct;
}
class MTLO_FM<bits<6> funct> : StdArch {
bits<5> rs;
bits<32> Inst;
let Inst{31-26} = 0;
let Inst{25-21} = rs;
let Inst{20-6} = 0;
let Inst{5-0} = funct;
}
class SEB_FM<bits<5> funct, bits<6> funct2> : StdArch {
bits<5> rd;
bits<5> rt;
bits<32> Inst;
let Inst{31-26} = 0x1f;
let Inst{25-21} = 0;
let Inst{20-16} = rt;
let Inst{15-11} = rd;
let Inst{10-6} = funct;
let Inst{5-0} = funct2;
}
class CLO_FM<bits<6> funct> : StdArch {
bits<5> rd;
bits<5> rs;
bits<5> rt;
bits<32> Inst;
let Inst{31-26} = 0x1c;
let Inst{25-21} = rs;
let Inst{20-16} = rt;
let Inst{15-11} = rd;
let Inst{10-6} = 0;
let Inst{5-0} = funct;
let rt = rd;
}
class LUI_FM : StdArch {
bits<5> rt;
bits<16> imm16;
bits<32> Inst;
let Inst{31-26} = 0xf;
let Inst{25-21} = 0;
let Inst{20-16} = rt;
let Inst{15-0} = imm16;
}
class JALR_FM {
bits<5> rd;
bits<5> rs;
bits<32> Inst;
let Inst{31-26} = 0;
let Inst{25-21} = rs;
let Inst{20-16} = 0;
let Inst{15-11} = rd;
let Inst{10-6} = 0;
let Inst{5-0} = 9;
}
class BGEZAL_FM<bits<5> funct> : StdArch {
bits<5> rs;
bits<16> offset;
bits<32> Inst;
let Inst{31-26} = 1;
let Inst{25-21} = rs;
let Inst{20-16} = funct;
let Inst{15-0} = offset;
}
class SYNC_FM : StdArch {
bits<5> stype;
bits<32> Inst;
let Inst{31-26} = 0;
let Inst{10-6} = stype;
let Inst{5-0} = 0xf;
}
class SYNCI_FM : StdArch {
// Produced by the mem_simm16 address as reg << 16 | imm (see getMemEncoding).
bits<21> addr;
bits<5> rs = addr{20-16};
bits<16> offset = addr{15-0};
bits<32> Inst;
let Inst{31-26} = 0b000001;
let Inst{25-21} = rs;
let Inst{20-16} = 0b11111;
let Inst{15-0} = offset;
}
class MULT_FM<bits<6> op, bits<6> funct> : StdArch {
bits<5> rs;
bits<5> rt;
bits<32> Inst;
let Inst{31-26} = op;
let Inst{25-21} = rs;
let Inst{20-16} = rt;
let Inst{15-6} = 0;
let Inst{5-0} = funct;
}
class EXT_FM<bits<6> funct> : StdArch {
bits<5> rt;
bits<5> rs;
bits<5> pos;
bits<5> size;
bits<32> Inst;
let Inst{31-26} = 0x1f;
let Inst{25-21} = rs;
let Inst{20-16} = rt;
let Inst{15-11} = size;
let Inst{10-6} = pos;
let Inst{5-0} = funct;
}
class RDHWR_FM : StdArch {
bits<5> rt;
bits<5> rd;
bits<3> sel;
bits<32> Inst;
let Inst{31-26} = 0x1f;
let Inst{25-21} = 0;
let Inst{20-16} = rt;
let Inst{15-11} = rd;
let Inst{10-9} = 0b00;
let Inst{8-6} = sel;
let Inst{5-0} = 0x3b;
}
class TEQ_FM<bits<6> funct> : StdArch {
bits<5> rs;
bits<5> rt;
bits<10> code_;
bits<32> Inst;
let Inst{31-26} = 0;
let Inst{25-21} = rs;
let Inst{20-16} = rt;
let Inst{15-6} = code_;
let Inst{5-0} = funct;
}
class TEQI_FM<bits<5> funct> : StdArch {
bits<5> rs;
bits<16> imm16;
bits<32> Inst;
let Inst{31-26} = 1;
let Inst{25-21} = rs;
let Inst{20-16} = funct;
let Inst{15-0} = imm16;
}
class WAIT_FM : StdArch {
bits<32> Inst;
let Inst{31-26} = 0x10;
let Inst{25} = 1;
let Inst{24-6} = 0;
let Inst{5-0} = 0x20;
}
class EXTS_FM<bits<6> funct> : StdArch {
bits<5> rt;
bits<5> rs;
bits<5> pos;
bits<5> lenm1;
bits<32> Inst;
let Inst{31-26} = 0x1c;
let Inst{25-21} = rs;
let Inst{20-16} = rt;
let Inst{15-11} = lenm1;
let Inst{10-6} = pos;
let Inst{5-0} = funct;
}
class MTMR_FM<bits<6> funct> : StdArch {
bits<5> rs;
bits<32> Inst;
let Inst{31-26} = 0x1c;
let Inst{25-21} = rs;
let Inst{20-6} = 0;
let Inst{5-0} = funct;
}
class POP_FM<bits<6> funct> : StdArch {
bits<5> rd;
bits<5> rs;
bits<32> Inst;
let Inst{31-26} = 0x1c;
let Inst{25-21} = rs;
let Inst{20-16} = 0;
let Inst{15-11} = rd;
let Inst{10-6} = 0;
let Inst{5-0} = funct;
}
class SEQ_FM<bits<6> funct> : StdArch {
bits<5> rd;
bits<5> rs;
bits<5> rt;
bits<32> Inst;
let Inst{31-26} = 0x1c;
let Inst{25-21} = rs;
let Inst{20-16} = rt;
let Inst{15-11} = rd;
let Inst{10-6} = 0;
let Inst{5-0} = funct;
}
class SEQI_FM<bits<6> funct> : StdArch {
bits<5> rs;
bits<5> rt;
bits<10> imm10;
bits<32> Inst;
let Inst{31-26} = 0x1c;
let Inst{25-21} = rs;
let Inst{20-16} = rt;
let Inst{15-6} = imm10;
let Inst{5-0} = funct;
}
class SAA_FM<bits<6> funct> : StdArch {
bits<5> rt;
bits<5> rs;
bits<32> Inst;
let Inst{31-26} = 0x1c;
let Inst{25-21} = rs;
let Inst{20-16} = rt;
let Inst{15-6} = 0;
let Inst{5-0} = funct;
}
//===----------------------------------------------------------------------===//
// System calls format <op|code_|funct>
//===----------------------------------------------------------------------===//
class SYS_FM<bits<6> funct> : StdArch
{
bits<20> code_;
bits<32> Inst;
let Inst{31-26} = 0x0;
let Inst{25-6} = code_;
let Inst{5-0} = funct;
}
//===----------------------------------------------------------------------===//
// Break instruction format <op|code_1|funct>
//===----------------------------------------------------------------------===//
class BRK_FM<bits<6> funct> : StdArch
{
bits<10> code_1;
bits<10> code_2;
bits<32> Inst;
let Inst{31-26} = 0x0;
let Inst{25-16} = code_1;
let Inst{15-6} = code_2;
let Inst{5-0} = funct;
}
//===----------------------------------------------------------------------===//
// Exception return format <Cop0|1|0|funct>
//===----------------------------------------------------------------------===//
class ER_FM<bits<6> funct, bit LLBit> : StdArch
{
bits<32> Inst;
let Inst{31-26} = 0x10;
let Inst{25} = 1;
let Inst{24-7} = 0;
let Inst{6} = LLBit;
let Inst{5-0} = funct;
}
//===----------------------------------------------------------------------===//
// Enable/disable interrupt instruction format <Cop0|MFMC0|rt|12|0|sc|0|0>
//===----------------------------------------------------------------------===//
class EI_FM<bits<1> sc> : StdArch
{
bits<32> Inst;
bits<5> rt;
let Inst{31-26} = 0x10;
let Inst{25-21} = 0xb;
let Inst{20-16} = rt;
let Inst{15-11} = 0xc;
let Inst{10-6} = 0;
let Inst{5} = sc;
let Inst{4-0} = 0;
}
//===----------------------------------------------------------------------===//
//
// FLOATING POINT INSTRUCTION FORMATS
//
// opcode - operation code.
// fs - src reg.
// ft - dst reg (on a 2 regs instr) or src reg (on a 3 reg instr).
// fd - dst reg, only used on 3 regs instr.
// fmt - double or single precision.
// funct - combined with opcode field give us an operation code.
//
//===----------------------------------------------------------------------===//
//===----------------------------------------------------------------------===//
// Format FI instruction class in Mips : <|opcode|base|ft|immediate|>
//===----------------------------------------------------------------------===//
class ADDS_FM<bits<6> funct, bits<5> fmt> : StdArch {
bits<5> fd;
bits<5> fs;
bits<5> ft;
bits<32> Inst;
let Inst{31-26} = 0x11;
let Inst{25-21} = fmt;
let Inst{20-16} = ft;
let Inst{15-11} = fs;
let Inst{10-6} = fd;
let Inst{5-0} = funct;
}
class ABSS_FM<bits<6> funct, bits<5> fmt> : StdArch {
bits<5> fd;
bits<5> fs;
bits<32> Inst;
let Inst{31-26} = 0x11;
let Inst{25-21} = fmt;
let Inst{20-16} = 0;
let Inst{15-11} = fs;
let Inst{10-6} = fd;
let Inst{5-0} = funct;
}
class MFC1_FM<bits<5> funct> : StdArch {
bits<5> rt;
bits<5> fs;
bits<32> Inst;
let Inst{31-26} = 0x11;
let Inst{25-21} = funct;
let Inst{20-16} = rt;
let Inst{15-11} = fs;
let Inst{10-0} = 0;
}
class LW_FM<bits<6> op> : StdArch {
bits<5> rt;
bits<21> addr;
bits<32> Inst;
let Inst{31-26} = op;
let Inst{25-21} = addr{20-16};
let Inst{20-16} = rt;
let Inst{15-0} = addr{15-0};
}
class MADDS_FM<bits<3> funct, bits<3> fmt> : StdArch {
bits<5> fd;
bits<5> fr;
bits<5> fs;
bits<5> ft;
bits<32> Inst;
let Inst{31-26} = 0x13;
let Inst{25-21} = fr;
let Inst{20-16} = ft;
let Inst{15-11} = fs;
let Inst{10-6} = fd;
let Inst{5-3} = funct;
let Inst{2-0} = fmt;
}
class LWXC1_FM<bits<6> funct> : StdArch {
bits<5> fd;
bits<5> base;
bits<5> index;
bits<32> Inst;
let Inst{31-26} = 0x13;
let Inst{25-21} = base;
let Inst{20-16} = index;
let Inst{15-11} = 0;
let Inst{10-6} = fd;
let Inst{5-0} = funct;
}
class SWXC1_FM<bits<6> funct> : StdArch {
bits<5> fs;
bits<5> base;
bits<5> index;
bits<32> Inst;
let Inst{31-26} = 0x13;
let Inst{25-21} = base;
let Inst{20-16} = index;
let Inst{15-11} = fs;
let Inst{10-6} = 0;
let Inst{5-0} = funct;
}
class BC1F_FM<bit nd, bit tf> : StdArch {
bits<3> fcc;
bits<16> offset;
bits<32> Inst;
let Inst{31-26} = 0x11;
let Inst{25-21} = 0x8;
let Inst{20-18} = fcc;
let Inst{17} = nd;
let Inst{16} = tf;
let Inst{15-0} = offset;
}
class CEQS_FM<bits<5> fmt> : StdArch {
bits<5> fs;
bits<5> ft;
bits<3> fcc;
bits<4> cond;
bits<32> Inst;
let Inst{31-26} = 0x11;
let Inst{25-21} = fmt;
let Inst{20-16} = ft;
let Inst{15-11} = fs;
let Inst{10-8} = fcc;
let Inst{7-4} = 0x3;
let Inst{3-0} = cond;
}
class C_COND_FM<bits<5> fmt, bits<4> c> : CEQS_FM<fmt> {
let cond = c;
}
class CMov_I_F_FM<bits<6> funct, bits<5> fmt> : StdArch {
bits<5> fd;
bits<5> fs;
bits<5> rt;
bits<32> Inst;
let Inst{31-26} = 0x11;
let Inst{25-21} = fmt;
let Inst{20-16} = rt;
let Inst{15-11} = fs;
let Inst{10-6} = fd;
let Inst{5-0} = funct;
}
class CMov_F_I_FM<bit tf> : StdArch {
bits<5> rd;
bits<5> rs;
bits<3> fcc;
bits<32> Inst;
let Inst{31-26} = 0;
let Inst{25-21} = rs;
let Inst{20-18} = fcc;
let Inst{17} = 0;
let Inst{16} = tf;
let Inst{15-11} = rd;
let Inst{10-6} = 0;
let Inst{5-0} = 1;
}
class CMov_F_F_FM<bits<5> fmt, bit tf> : StdArch {
bits<5> fd;
bits<5> fs;
bits<3> fcc;
bits<32> Inst;
let Inst{31-26} = 0x11;
let Inst{25-21} = fmt;
let Inst{20-18} = fcc;
let Inst{17} = 0;
let Inst{16} = tf;
let Inst{15-11} = fs;
let Inst{10-6} = fd;
let Inst{5-0} = 0x11;
}
class BARRIER_FM<bits<5> op> : StdArch {
bits<32> Inst;
let Inst{31-26} = 0; // SPECIAL
let Inst{25-21} = 0;
let Inst{20-16} = 0; // rt = 0
let Inst{15-11} = 0; // rd = 0
let Inst{10-6} = op; // Operation
let Inst{5-0} = 0; // SLL
}
class SDBBP_FM : StdArch {
bits<20> code_;
bits<32> Inst;
let Inst{31-26} = 0b011100; // SPECIAL2
let Inst{25-6} = code_;
let Inst{5-0} = 0b111111; // SDBBP
}
class JR_HB_FM<bits<6> op> : StdArch{
bits<5> rs;
bits<32> Inst;
let Inst{31-26} = 0; // SPECIAL
let Inst{25-21} = rs;
let Inst{20-11} = 0;
let Inst{10} = 1;
let Inst{9-6} = 0;
let Inst{5-0} = op;
}
class JALR_HB_FM<bits<6> op> : StdArch {
bits<5> rd;
bits<5> rs;
bits<32> Inst;
let Inst{31-26} = 0; // SPECIAL
let Inst{25-21} = rs;
let Inst{20-16} = 0;
let Inst{15-11} = rd;
let Inst{10} = 1;
let Inst{9-6} = 0;
let Inst{5-0} = op;
}
class COP0_TLB_FM<bits<6> op> : StdArch {
bits<32> Inst;
let Inst{31-26} = 0x10; // COP0
let Inst{25} = 1; // CO
let Inst{24-6} = 0;
let Inst{5-0} = op; // Operation
}
class CACHEOP_FM<bits<6> op> : StdArch {
bits<21> addr;
bits<5> hint;
bits<5> base = addr{20-16};
bits<16> offset = addr{15-0};
bits<32> Inst;
let Inst{31-26} = op;
let Inst{25-21} = base;
let Inst{20-16} = hint;
let Inst{15-0} = offset;
}
class HYPCALL_FM<bits<6> op> : StdArch {
bits<10> code_;
bits<32> Inst;
let Inst{31-26} = 0b010000;
let Inst{25} = 1;
let Inst{20-11} = code_;
let Inst{5-0} = op;
}
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