macromem.cc

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/*
 * Copyright (c) 2010-2014, 2020 ARM Limited
 * All rights reserved
 *
 * The license below extends only to copyright in the software and shall
 * not be construed as granting a license to any other intellectual
 * property including but not limited to intellectual property relating
 * to a hardware implementation of the functionality of the software
 * licensed hereunder.  You may use the software subject to the license
 * terms below provided that you ensure that this notice is replicated
 * unmodified and in its entirety in all distributions of the software,
 * modified or unmodified, in source code or in binary form.
 *
 * Copyright (c) 2007-2008 The Florida State University
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met: redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer;
 * redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution;
 * neither the name of the copyright holders nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 
#include "arch/arm/insts/macromem.hh"
 
#include <sstream>
 
#include "arch/arm/generated/decoder.hh"
#include "arch/arm/insts/neon64_mem.hh"
#include "base/compiler.hh"
 
namespace gem5
{
 
using namespace ArmISAInst;
 
namespace ArmISA
{
 
MacroMemOp::MacroMemOp(const char *mnem, ExtMachInst machInst,
                       OpClass __opClass, IntRegIndex rn,
                       bool index, bool up, bool user, bool writeback,
                       bool load, uint32_t reglist) :
    PredMacroOp(mnem, machInst, __opClass)
{
    uint32_t regs = reglist;
    uint32_t ones = number_of_ones(reglist);
    uint32_t mem_ops = ones;
 
    // Copy the base address register if we overwrite it, or if this instruction
    // is basically a no-op (we have to do something)
    bool copy_base =  (bits(reglist, rn) && load) || !ones;
    bool force_user = user & !bits(reglist, 15);
    bool exception_ret = user & bits(reglist, 15);
    bool pc_temp = load && writeback && bits(reglist, 15);
 
    if (!ones) {
        numMicroops = 1;
    } else if (load) {
        numMicroops = ((ones + 1) / 2)
                    + ((ones % 2 == 0 && exception_ret) ? 1 : 0)
                    + (copy_base ? 1 : 0)
                    + (writeback? 1 : 0)
                    + (pc_temp ? 1 : 0);
    } else {
        numMicroops = ones + (writeback ? 1 : 0);
    }
 
    microOps = new StaticInstPtr[numMicroops];
 
    uint32_t addr = 0;
 
    if (!up)
        addr = (ones << 2) - 4;
 
    if (!index)
        addr += 4;
 
    StaticInstPtr *uop = microOps;
 
    // Add 0 to Rn and stick it in ureg0.
    // This is equivalent to a move.
    if (copy_base)
        *uop++ = new MicroAddiUop(machInst, INTREG_UREG0, rn, 0);
 
    unsigned reg = 0;
    while (mem_ops != 0) {
        // Do load operations in pairs if possible
        if (load && mem_ops >= 2 &&
            !(mem_ops == 2 && bits(regs,INTREG_PC) && exception_ret)) {
            // 64-bit memory operation
            // Find 2 set register bits (clear them after finding)
            unsigned reg_idx1;
            unsigned reg_idx2;
 
            // Find the first register
            while (!bits(regs, reg)) reg++;
            replaceBits(regs, reg, 0);
            reg_idx1 = force_user ? intRegInMode(MODE_USER, reg) : reg;
 
            // Find the second register
            while (!bits(regs, reg)) reg++;
            replaceBits(regs, reg, 0);
            reg_idx2 = force_user ? intRegInMode(MODE_USER, reg) : reg;
 
            // Load into temp reg if necessary
            if (reg_idx2 == INTREG_PC && pc_temp)
                reg_idx2 = INTREG_UREG1;
 
            // Actually load both registers from memory
            *uop = new MicroLdr2Uop(machInst, reg_idx1, reg_idx2,
                    copy_base ? INTREG_UREG0 : rn, up, addr);
 
            if (!writeback && reg_idx2 == INTREG_PC) {
                // No writeback if idx==pc, set appropriate flags
                (*uop)->setFlag(StaticInst::IsControl);
                (*uop)->setFlag(StaticInst::IsIndirectControl);
 
                if (!(condCode == COND_AL || condCode == COND_UC))
                    (*uop)->setFlag(StaticInst::IsCondControl);
                else
                    (*uop)->setFlag(StaticInst::IsUncondControl);
            }
 
            if (up) addr += 8;
            else addr -= 8;
            mem_ops -= 2;
        } else {
            // 32-bit memory operation
            // Find register for operation
            unsigned reg_idx;
            while (!bits(regs, reg)) reg++;
            replaceBits(regs, reg, 0);
            reg_idx = force_user ? intRegInMode(MODE_USER, reg) : reg;
 
            if (load) {
                if (writeback && reg_idx == INTREG_PC) {
                    // If this instruction changes the PC and performs a
                    // writeback, ensure the pc load/branch is the last uop.
                    // Load into a temp reg here.
                    *uop = new MicroLdrUop(machInst, INTREG_UREG1,
                            copy_base ? INTREG_UREG0 : rn, up, addr);
                } else if (reg_idx == INTREG_PC && exception_ret) {
                    // Special handling for exception return
                    *uop = new MicroLdrRetUop(machInst, reg_idx,
                            copy_base ? INTREG_UREG0 : rn, up, addr);
                } else {
                    // standard single load uop
                    *uop = new MicroLdrUop(machInst, reg_idx,
                            copy_base ? INTREG_UREG0 : rn, up, addr);
                }
 
                // Loading pc as last operation?  Set appropriate flags.
                if (!writeback && reg_idx == INTREG_PC) {
                    (*uop)->setFlag(StaticInst::IsControl);
                    (*uop)->setFlag(StaticInst::IsIndirectControl);
 
                    if (!(condCode == COND_AL || condCode == COND_UC))
                        (*uop)->setFlag(StaticInst::IsCondControl);
                    else
                        (*uop)->setFlag(StaticInst::IsUncondControl);
                }
            } else {
                *uop = new MicroStrUop(machInst, reg_idx, rn, up, addr);
            }
 
            if (up) addr += 4;
            else addr -= 4;
            --mem_ops;
        }
 
        // Load/store micro-op generated, go to next uop
        ++uop;
    }
 
    if (writeback && ones) {
        // Perform writeback uop operation
        if (up)
            *uop++ = new MicroAddiUop(machInst, rn, rn, ones * 4);
        else
            *uop++ = new MicroSubiUop(machInst, rn, rn, ones * 4);
 
        // Write PC after address writeback?
        if (pc_temp) {
            if (exception_ret) {
                *uop = new MicroUopRegMovRet(machInst, 0, INTREG_UREG1);
            } else {
                *uop = new MicroUopRegMov(machInst, INTREG_PC, INTREG_UREG1);
            }
            (*uop)->setFlag(StaticInst::IsControl);
            (*uop)->setFlag(StaticInst::IsIndirectControl);
 
            if (!(condCode == COND_AL || condCode == COND_UC))
                (*uop)->setFlag(StaticInst::IsCondControl);
            else
                (*uop)->setFlag(StaticInst::IsUncondControl);
 
            if (rn == INTREG_SP)
                (*uop)->setFlag(StaticInst::IsReturn);
 
            ++uop;
        }
    }
 
    --uop;
    (*uop)->setLastMicroop();
    microOps[0]->setFirstMicroop();
 
    /* Take the control flags from the last microop for the macroop */
    if ((*uop)->isControl())
        setFlag(StaticInst::IsControl);
    if ((*uop)->isCondCtrl())
        setFlag(StaticInst::IsCondControl);
    if ((*uop)->isUncondCtrl())
        setFlag(StaticInst::IsUncondControl);
    if ((*uop)->isIndirectCtrl())
        setFlag(StaticInst::IsIndirectControl);
    if ((*uop)->isReturn())
        setFlag(StaticInst::IsReturn);
 
    for (StaticInstPtr *uop = microOps; !(*uop)->isLastMicroop(); uop++) {
        (*uop)->setDelayedCommit();
    }
}
 
PairMemOp::PairMemOp(const char *mnem, ExtMachInst machInst, OpClass __opClass,
                     uint32_t size, bool fp, bool load, bool noAlloc,
                     bool signExt, bool exclusive, bool acrel,
                     int64_t imm, AddrMode mode,
                     IntRegIndex rn, IntRegIndex rt, IntRegIndex rt2) :
    PredMacroOp(mnem, machInst, __opClass)
{
    bool post = (mode == AddrMd_PostIndex);
    bool writeback = (mode != AddrMd_Offset);
 
    if (load) {
        // Use integer rounding to round up loads of size 4
        numMicroops = (post ? 0 : 1) + ((size + 4) / 8) + (writeback ? 1 : 0);
    } else {
        numMicroops = (post ? 0 : 1) + (size / 4) + (writeback ? 1 : 0);
    }
    microOps = new StaticInstPtr[numMicroops];
 
    StaticInstPtr *uop = microOps;
 
    rn = makeSP(rn);
 
    if (!post) {
        *uop++ = new MicroAddXiSpAlignUop(machInst, INTREG_UREG0, rn,
                post ? 0 : imm);
    }
 
    if (fp) {
        if (size == 16) {
            if (load) {
                *uop++ = new MicroLdFp16Uop(machInst, rt,
                        post ? rn : INTREG_UREG0, 0, noAlloc, exclusive, acrel);
                *uop++ = new MicroLdFp16Uop(machInst, rt2,
                        post ? rn : INTREG_UREG0, 16, noAlloc, exclusive, acrel);
            } else {
                *uop++ = new MicroStrQBFpXImmUop(machInst, rt,
                        post ? rn : INTREG_UREG0, 0, noAlloc, exclusive, acrel);
                *uop++ = new MicroStrQTFpXImmUop(machInst, rt,
                        post ? rn : INTREG_UREG0, 0, noAlloc, exclusive, acrel);
                *uop++ = new MicroStrQBFpXImmUop(machInst, rt2,
                        post ? rn : INTREG_UREG0, 16, noAlloc, exclusive, acrel);
                *uop++ = new MicroStrQTFpXImmUop(machInst, rt2,
                        post ? rn : INTREG_UREG0, 16, noAlloc, exclusive, acrel);
            }
        } else if (size == 8) {
            if (load) {
                *uop++ = new MicroLdPairFp8Uop(machInst, rt, rt2,
                        post ? rn : INTREG_UREG0, 0, noAlloc, exclusive, acrel);
            } else {
                *uop++ = new MicroStrFpXImmUop(machInst, rt,
                        post ? rn : INTREG_UREG0, 0, noAlloc, exclusive, acrel);
                *uop++ = new MicroStrFpXImmUop(machInst, rt2,
                        post ? rn : INTREG_UREG0, 8, noAlloc, exclusive, acrel);
            }
        } else if (size == 4) {
            if (load) {
                *uop++ = new MicroLdrDFpXImmUop(machInst, rt, rt2,
                        post ? rn : INTREG_UREG0, 0, noAlloc, exclusive, acrel);
            } else {
                *uop++ = new MicroStrDFpXImmUop(machInst, rt, rt2,
                        post ? rn : INTREG_UREG0, 0, noAlloc, exclusive, acrel);
            }
        }
    } else {
        if (size == 8) {
            if (load) {
                *uop++ = new MicroLdPairUop(machInst, rt, rt2,
                        post ? rn : INTREG_UREG0, 0, noAlloc, exclusive, acrel);
            } else {
                *uop++ = new MicroStrXImmUop(machInst, rt, post ? rn : INTREG_UREG0,
                        0, noAlloc, exclusive, acrel);
                *uop++ = new MicroStrXImmUop(machInst, rt2, post ? rn : INTREG_UREG0,
                        size, noAlloc, exclusive, acrel);
            }
        } else if (size == 4) {
            if (load) {
                if (signExt) {
                    *uop++ = new MicroLdrDSXImmUop(machInst, rt, rt2,
                            post ? rn : INTREG_UREG0, 0, noAlloc, exclusive, acrel);
                } else {
                    *uop++ = new MicroLdrDUXImmUop(machInst, rt, rt2,
                            post ? rn : INTREG_UREG0, 0, noAlloc, exclusive, acrel);
                }
            } else {
                *uop++ = new MicroStrDXImmUop(machInst, rt, rt2,
                        post ? rn : INTREG_UREG0, 0, noAlloc, exclusive, acrel);
            }
        }
    }
 
    if (writeback) {
        *uop++ = new MicroAddXiUop(machInst, rn, post ? rn : INTREG_UREG0,
                                   post ? imm : 0);
    }
 
    assert(uop == &microOps[numMicroops]);
    (*--uop)->setLastMicroop();
    microOps[0]->setFirstMicroop();
 
    for (StaticInstPtr *curUop = microOps;
            !(*curUop)->isLastMicroop(); curUop++) {
        (*curUop)->setDelayedCommit();
    }
}
 
BigFpMemImmOp::BigFpMemImmOp(const char *mnem, ExtMachInst machInst,
                             OpClass __opClass, bool load, IntRegIndex dest,
                             IntRegIndex base, int64_t imm) :
    PredMacroOp(mnem, machInst, __opClass)
{
    numMicroops = load ? 1 : 2;
    microOps = new StaticInstPtr[numMicroops];
 
    StaticInstPtr *uop = microOps;
 
    if (load) {
        *uop = new MicroLdFp16Uop(machInst, dest, base, imm);
    } else {
        *uop = new MicroStrQBFpXImmUop(machInst, dest, base, imm);
        (*uop)->setDelayedCommit();
        *++uop = new MicroStrQTFpXImmUop(machInst, dest, base, imm);
    }
    (*uop)->setLastMicroop();
    microOps[0]->setFirstMicroop();
}
 
BigFpMemPostOp::BigFpMemPostOp(const char *mnem, ExtMachInst machInst,
                               OpClass __opClass, bool load, IntRegIndex dest,
                               IntRegIndex base, int64_t imm) :
    PredMacroOp(mnem, machInst, __opClass)
{
    numMicroops = load ? 2 : 3;
    microOps = new StaticInstPtr[numMicroops];
 
    StaticInstPtr *uop = microOps;
 
    if (load) {
        *uop++ = new MicroLdFp16Uop(machInst, dest, base, 0);
    } else {
        *uop++= new MicroStrQBFpXImmUop(machInst, dest, base, 0);
        *uop++ = new MicroStrQTFpXImmUop(machInst, dest, base, 0);
    }
    *uop = new MicroAddXiUop(machInst, base, base, imm);
    (*uop)->setLastMicroop();
    microOps[0]->setFirstMicroop();
 
    for (StaticInstPtr *curUop = microOps;
            !(*curUop)->isLastMicroop(); curUop++) {
        (*curUop)->setDelayedCommit();
    }
}
 
BigFpMemPreOp::BigFpMemPreOp(const char *mnem, ExtMachInst machInst,
                             OpClass __opClass, bool load, IntRegIndex dest,
                             IntRegIndex base, int64_t imm) :
    PredMacroOp(mnem, machInst, __opClass)
{
    numMicroops = load ? 2 : 3;
    microOps = new StaticInstPtr[numMicroops];
 
    StaticInstPtr *uop = microOps;
 
    if (load) {
        *uop++ = new MicroLdFp16Uop(machInst, dest, base, imm);
    } else {
        *uop++ = new MicroStrQBFpXImmUop(machInst, dest, base, imm);
        *uop++ = new MicroStrQTFpXImmUop(machInst, dest, base, imm);
    }
    *uop = new MicroAddXiUop(machInst, base, base, imm);
    (*uop)->setLastMicroop();
    microOps[0]->setFirstMicroop();
 
    for (StaticInstPtr *curUop = microOps;
            !(*curUop)->isLastMicroop(); curUop++) {
        (*curUop)->setDelayedCommit();
    }
}
 
BigFpMemRegOp::BigFpMemRegOp(const char *mnem, ExtMachInst machInst,
                             OpClass __opClass, bool load, IntRegIndex dest,
                             IntRegIndex base, IntRegIndex offset,
                             ArmExtendType type, int64_t imm) :
    PredMacroOp(mnem, machInst, __opClass)
{
    numMicroops = load ? 1 : 2;
    microOps = new StaticInstPtr[numMicroops];
 
    StaticInstPtr *uop = microOps;
 
    if (load) {
        *uop = new MicroLdFp16RegUop(machInst, dest, base,
                                  offset, type, imm);
    } else {
        *uop = new MicroStrQBFpXRegUop(machInst, dest, base,
                                       offset, type, imm);
        (*uop)->setDelayedCommit();
        *++uop = new MicroStrQTFpXRegUop(machInst, dest, base,
                                         offset, type, imm);
    }
 
    (*uop)->setLastMicroop();
    microOps[0]->setFirstMicroop();
}
 
BigFpMemLitOp::BigFpMemLitOp(const char *mnem, ExtMachInst machInst,
                             OpClass __opClass, IntRegIndex dest,
                             int64_t imm) :
    PredMacroOp(mnem, machInst, __opClass)
{
    numMicroops = 1;
    microOps = new StaticInstPtr[numMicroops];
 
    microOps[0] = new MicroLdFp16LitUop(machInst, dest, imm);
    microOps[0]->setLastMicroop();
    microOps[0]->setFirstMicroop();
}
 
VldMultOp::VldMultOp(const char *mnem, ExtMachInst machInst, OpClass __opClass,
                     unsigned elems, RegIndex rn, RegIndex vd, unsigned regs,
                     unsigned inc, uint32_t size, uint32_t align, RegIndex rm) :
    PredMacroOp(mnem, machInst, __opClass)
{
    assert(regs > 0 && regs <= 4);
    assert(regs % elems == 0);
 
    numMicroops = (regs > 2) ? 2 : 1;
    bool wb = (rm != 15);
    bool deinterleave = (elems > 1);
 
    if (wb) numMicroops++;
    if (deinterleave) numMicroops += (regs / elems);
    microOps = new StaticInstPtr[numMicroops];
 
    RegIndex rMid = deinterleave ? VecSpecialElem : vd * 2;
 
    uint32_t noAlign = 0;
 
    unsigned uopIdx = 0;
    switch (regs) {
      case 4:
        microOps[uopIdx++] = newNeonMemInst<MicroLdrNeon16Uop>(
                size, machInst, rMid, rn, 0, align);
        microOps[uopIdx++] = newNeonMemInst<MicroLdrNeon16Uop>(
                size, machInst, rMid + 4, rn, 16, noAlign);
        break;
      case 3:
        microOps[uopIdx++] = newNeonMemInst<MicroLdrNeon16Uop>(
                size, machInst, rMid, rn, 0, align);
        microOps[uopIdx++] = newNeonMemInst<MicroLdrNeon8Uop>(
                size, machInst, rMid + 4, rn, 16, noAlign);
        break;
      case 2:
        microOps[uopIdx++] = newNeonMemInst<MicroLdrNeon16Uop>(
                size, machInst, rMid, rn, 0, align);
        break;
      case 1:
        microOps[uopIdx++] = newNeonMemInst<MicroLdrNeon8Uop>(
                size, machInst, rMid, rn, 0, align);
        break;
      default:
        // Unknown number of registers
        microOps[uopIdx++] = new Unknown(machInst);
    }
    if (wb) {
        if (rm != 15 && rm != 13) {
            microOps[uopIdx++] =
                new MicroAddUop(machInst, rn, rn, rm, 0, ArmISA::LSL);
        } else {
            microOps[uopIdx++] =
                new MicroAddiUop(machInst, rn, rn, regs * 8);
        }
    }
    if (deinterleave) {
        switch (elems) {
          case 4:
            assert(regs == 4);
            microOps[uopIdx++] = newNeonMixInst<MicroDeintNeon8Uop>(
                    size, machInst, vd * 2, rMid, inc * 2);
            break;
          case 3:
            assert(regs == 3);
            microOps[uopIdx++] = newNeonMixInst<MicroDeintNeon6Uop>(
                    size, machInst, vd * 2, rMid, inc * 2);
            break;
          case 2:
            assert(regs == 4 || regs == 2);
            if (regs == 4) {
                microOps[uopIdx++] = newNeonMixInst<MicroDeintNeon4Uop>(
                        size, machInst, vd * 2, rMid, inc * 2);
                microOps[uopIdx++] = newNeonMixInst<MicroDeintNeon4Uop>(
                        size, machInst, vd * 2 + 2, rMid + 4, inc * 2);
            } else {
                microOps[uopIdx++] = newNeonMixInst<MicroDeintNeon4Uop>(
                        size, machInst, vd * 2, rMid, inc * 2);
            }
            break;
          default:
            // Bad number of elements to deinterleave
            microOps[uopIdx++] = new Unknown(machInst);
        }
    }
    assert(uopIdx == numMicroops);
 
    for (unsigned i = 0; i < numMicroops - 1; i++) {
        MicroOp * uopPtr = dynamic_cast<MicroOp *>(microOps[i].get());
        assert(uopPtr);
        uopPtr->setDelayedCommit();
    }
    microOps[0]->setFirstMicroop();
    microOps[numMicroops - 1]->setLastMicroop();
}
 
VldSingleOp::VldSingleOp(const char *mnem, ExtMachInst machInst,
                         OpClass __opClass, bool all, unsigned elems,
                         RegIndex rn, RegIndex vd, unsigned regs,
                         unsigned inc, uint32_t size, uint32_t align,
                         RegIndex rm, unsigned lane) :
    PredMacroOp(mnem, machInst, __opClass)
{
    assert(regs > 0 && regs <= 4);
    assert(regs % elems == 0);
 
    unsigned eBytes = (1 << size);
    unsigned loadSize = eBytes * elems;
    [[maybe_unused]] unsigned loadRegs =
        (loadSize + sizeof(uint32_t) - 1) / sizeof(uint32_t);
 
    assert(loadRegs > 0 && loadRegs <= 4);
 
    numMicroops = 1;
    bool wb = (rm != 15);
 
    if (wb) numMicroops++;
    numMicroops += (regs / elems);
    microOps = new StaticInstPtr[numMicroops];
 
    RegIndex ufp0 = VecSpecialElem;
 
    unsigned uopIdx = 0;
    switch (loadSize) {
      case 1:
        microOps[uopIdx++] = new MicroLdrNeon1Uop<uint8_t>(
                machInst, ufp0, rn, 0, align);
        break;
      case 2:
        if (eBytes == 2) {
            microOps[uopIdx++] = new MicroLdrNeon2Uop<uint16_t>(
                    machInst, ufp0, rn, 0, align);
        } else {
            microOps[uopIdx++] = new MicroLdrNeon2Uop<uint8_t>(
                    machInst, ufp0, rn, 0, align);
        }
        break;
      case 3:
        microOps[uopIdx++] = new MicroLdrNeon3Uop<uint8_t>(
                machInst, ufp0, rn, 0, align);
        break;
      case 4:
        switch (eBytes) {
          case 1:
            microOps[uopIdx++] = new MicroLdrNeon4Uop<uint8_t>(
                    machInst, ufp0, rn, 0, align);
            break;
          case 2:
            microOps[uopIdx++] = new MicroLdrNeon4Uop<uint16_t>(
                    machInst, ufp0, rn, 0, align);
            break;
          case 4:
            microOps[uopIdx++] = new MicroLdrNeon4Uop<uint32_t>(
                    machInst, ufp0, rn, 0, align);
            break;
        }
        break;
      case 6:
        microOps[uopIdx++] = new MicroLdrNeon6Uop<uint16_t>(
                machInst, ufp0, rn, 0, align);
        break;
      case 8:
        switch (eBytes) {
          case 2:
            microOps[uopIdx++] = new MicroLdrNeon8Uop<uint16_t>(
                    machInst, ufp0, rn, 0, align);
            break;
          case 4:
            microOps[uopIdx++] = new MicroLdrNeon8Uop<uint32_t>(
                    machInst, ufp0, rn, 0, align);
            break;
        }
        break;
      case 12:
        microOps[uopIdx++] = new MicroLdrNeon12Uop<uint32_t>(
                machInst, ufp0, rn, 0, align);
        break;
      case 16:
        microOps[uopIdx++] = new MicroLdrNeon16Uop<uint32_t>(
                machInst, ufp0, rn, 0, align);
        break;
      default:
        // Unrecognized load size
        microOps[uopIdx++] = new Unknown(machInst);
    }
    if (wb) {
        if (rm != 15 && rm != 13) {
            microOps[uopIdx++] =
                new MicroAddUop(machInst, rn, rn, rm, 0, ArmISA::LSL);
        } else {
            microOps[uopIdx++] =
                new MicroAddiUop(machInst, rn, rn, loadSize);
        }
    }
    switch (elems) {
      case 4:
        assert(regs == 4);
        switch (size) {
          case 0:
            if (all) {
                microOps[uopIdx++] = new MicroUnpackAllNeon2to8Uop<uint8_t>(
                        machInst, vd * 2, ufp0, inc * 2);
            } else {
                microOps[uopIdx++] = new MicroUnpackNeon2to8Uop<uint8_t>(
                        machInst, vd * 2, ufp0, inc * 2, lane);
            }
            break;
          case 1:
            if (all) {
                microOps[uopIdx++] = new MicroUnpackAllNeon2to8Uop<uint16_t>(
                        machInst, vd * 2, ufp0, inc * 2);
            } else {
                microOps[uopIdx++] = new MicroUnpackNeon2to8Uop<uint16_t>(
                        machInst, vd * 2, ufp0, inc * 2, lane);
            }
            break;
          case 2:
            if (all) {
                microOps[uopIdx++] = new MicroUnpackAllNeon4to8Uop<uint32_t>(
                        machInst, vd * 2, ufp0, inc * 2);
            } else {
                microOps[uopIdx++] = new MicroUnpackNeon4to8Uop<uint32_t>(
                        machInst, vd * 2, ufp0, inc * 2, lane);
            }
            break;
          default:
            // Bad size
            microOps[uopIdx++] = new Unknown(machInst);
            break;
        }
        break;
      case 3:
        assert(regs == 3);
        switch (size) {
          case 0:
            if (all) {
                microOps[uopIdx++] = new MicroUnpackAllNeon2to6Uop<uint8_t>(
                        machInst, vd * 2, ufp0, inc * 2);
            } else {
                microOps[uopIdx++] = new MicroUnpackNeon2to6Uop<uint8_t>(
                        machInst, vd * 2, ufp0, inc * 2, lane);
            }
            break;
          case 1:
            if (all) {
                microOps[uopIdx++] = new MicroUnpackAllNeon2to6Uop<uint16_t>(
                        machInst, vd * 2, ufp0, inc * 2);
            } else {
                microOps[uopIdx++] = new MicroUnpackNeon2to6Uop<uint16_t>(
                        machInst, vd * 2, ufp0, inc * 2, lane);
            }
            break;
          case 2:
            if (all) {
                microOps[uopIdx++] = new MicroUnpackAllNeon4to6Uop<uint32_t>(
                        machInst, vd * 2, ufp0, inc * 2);
            } else {
                microOps[uopIdx++] = new MicroUnpackNeon4to6Uop<uint32_t>(
                        machInst, vd * 2, ufp0, inc * 2, lane);
            }
            break;
          default:
            // Bad size
            microOps[uopIdx++] = new Unknown(machInst);
            break;
        }
        break;
      case 2:
        assert(regs == 2);
        assert(loadRegs <= 2);
        switch (size) {
          case 0:
            if (all) {
                microOps[uopIdx++] = new MicroUnpackAllNeon2to4Uop<uint8_t>(
                        machInst, vd * 2, ufp0, inc * 2);
            } else {
                microOps[uopIdx++] = new MicroUnpackNeon2to4Uop<uint8_t>(
                        machInst, vd * 2, ufp0, inc * 2, lane);
            }
            break;
          case 1:
            if (all) {
                microOps[uopIdx++] = new MicroUnpackAllNeon2to4Uop<uint16_t>(
                        machInst, vd * 2, ufp0, inc * 2);
            } else {
                microOps[uopIdx++] = new MicroUnpackNeon2to4Uop<uint16_t>(
                        machInst, vd * 2, ufp0, inc * 2, lane);
            }
            break;
          case 2:
            if (all) {
                microOps[uopIdx++] = new MicroUnpackAllNeon2to4Uop<uint32_t>(
                        machInst, vd * 2, ufp0, inc * 2);
            } else {
                microOps[uopIdx++] = new MicroUnpackNeon2to4Uop<uint32_t>(
                        machInst, vd * 2, ufp0, inc * 2, lane);
            }
            break;
          default:
            // Bad size
            microOps[uopIdx++] = new Unknown(machInst);
            break;
        }
        break;
      case 1:
        assert(regs == 1 || (all && regs == 2));
        assert(loadRegs <= 2);
        for (unsigned offset = 0; offset < regs; offset++) {
            switch (size) {
              case 0:
                if (all) {
                    microOps[uopIdx++] =
                        new MicroUnpackAllNeon2to2Uop<uint8_t>(
                            machInst, (vd + offset) * 2, ufp0, inc * 2);
                } else {
                    microOps[uopIdx++] =
                        new MicroUnpackNeon2to2Uop<uint8_t>(
                            machInst, (vd + offset) * 2, ufp0, inc * 2, lane);
                }
                break;
              case 1:
                if (all) {
                    microOps[uopIdx++] =
                        new MicroUnpackAllNeon2to2Uop<uint16_t>(
                            machInst, (vd + offset) * 2, ufp0, inc * 2);
                } else {
                    microOps[uopIdx++] =
                        new MicroUnpackNeon2to2Uop<uint16_t>(
                            machInst, (vd + offset) * 2, ufp0, inc * 2, lane);
                }
                break;
              case 2:
                if (all) {
                    microOps[uopIdx++] =
                        new MicroUnpackAllNeon2to2Uop<uint32_t>(
                            machInst, (vd + offset) * 2, ufp0, inc * 2);
                } else {
                    microOps[uopIdx++] =
                        new MicroUnpackNeon2to2Uop<uint32_t>(
                            machInst, (vd + offset) * 2, ufp0, inc * 2, lane);
                }
                break;
              default:
                // Bad size
                microOps[uopIdx++] = new Unknown(machInst);
                break;
            }
        }
        break;
      default:
        // Bad number of elements to unpack
        microOps[uopIdx++] = new Unknown(machInst);
    }
    assert(uopIdx == numMicroops);
 
    for (unsigned i = 0; i < numMicroops - 1; i++) {
        MicroOp * uopPtr = dynamic_cast<MicroOp *>(microOps[i].get());
        assert(uopPtr);
        uopPtr->setDelayedCommit();
    }
    microOps[0]->setFirstMicroop();
    microOps[numMicroops - 1]->setLastMicroop();
}
 
VstMultOp::VstMultOp(const char *mnem, ExtMachInst machInst, OpClass __opClass,
                     unsigned elems, RegIndex rn, RegIndex vd, unsigned regs,
                     unsigned inc, uint32_t size, uint32_t align, RegIndex rm) :
    PredMacroOp(mnem, machInst, __opClass)
{
    assert(regs > 0 && regs <= 4);
    assert(regs % elems == 0);
 
    numMicroops = (regs > 2) ? 2 : 1;
    bool wb = (rm != 15);
    bool interleave = (elems > 1);
 
    if (wb) numMicroops++;
    if (interleave) numMicroops += (regs / elems);
    microOps = new StaticInstPtr[numMicroops];
 
    uint32_t noAlign = 0;
 
    RegIndex rMid = interleave ? VecSpecialElem : vd * 2;
 
    unsigned uopIdx = 0;
    if (interleave) {
        switch (elems) {
          case 4:
            assert(regs == 4);
            microOps[uopIdx++] = newNeonMixInst<MicroInterNeon8Uop>(
                    size, machInst, rMid, vd * 2, inc * 2);
            break;
          case 3:
            assert(regs == 3);
            microOps[uopIdx++] = newNeonMixInst<MicroInterNeon6Uop>(
                    size, machInst, rMid, vd * 2, inc * 2);
            break;
          case 2:
            assert(regs == 4 || regs == 2);
            if (regs == 4) {
                microOps[uopIdx++] = newNeonMixInst<MicroInterNeon4Uop>(
                        size, machInst, rMid, vd * 2, inc * 2);
                microOps[uopIdx++] = newNeonMixInst<MicroInterNeon4Uop>(
                        size, machInst, rMid + 4, vd * 2 + 2, inc * 2);
            } else {
                microOps[uopIdx++] = newNeonMixInst<MicroInterNeon4Uop>(
                        size, machInst, rMid, vd * 2, inc * 2);
            }
            break;
          default:
            // Bad number of elements to interleave
            microOps[uopIdx++] = new Unknown(machInst);
        }
    }
    switch (regs) {
      case 4:
        microOps[uopIdx++] = newNeonMemInst<MicroStrNeon16Uop>(
                size, machInst, rMid, rn, 0, align);
        microOps[uopIdx++] = newNeonMemInst<MicroStrNeon16Uop>(
                size, machInst, rMid + 4, rn, 16, noAlign);
        break;
      case 3:
        microOps[uopIdx++] = newNeonMemInst<MicroStrNeon16Uop>(
                size, machInst, rMid, rn, 0, align);
        microOps[uopIdx++] = newNeonMemInst<MicroStrNeon8Uop>(
                size, machInst, rMid + 4, rn, 16, noAlign);
        break;
      case 2:
        microOps[uopIdx++] = newNeonMemInst<MicroStrNeon16Uop>(
                size, machInst, rMid, rn, 0, align);
        break;
      case 1:
        microOps[uopIdx++] = newNeonMemInst<MicroStrNeon8Uop>(
                size, machInst, rMid, rn, 0, align);
        break;
      default:
        // Unknown number of registers
        microOps[uopIdx++] = new Unknown(machInst);
    }
    if (wb) {
        if (rm != 15 && rm != 13) {
            microOps[uopIdx++] =
                new MicroAddUop(machInst, rn, rn, rm, 0, ArmISA::LSL);
        } else {
            microOps[uopIdx++] =
                new MicroAddiUop(machInst, rn, rn, regs * 8);
        }
    }
    assert(uopIdx == numMicroops);
 
    for (unsigned i = 0; i < numMicroops - 1; i++) {
        MicroOp * uopPtr = dynamic_cast<MicroOp *>(microOps[i].get());
        assert(uopPtr);
        uopPtr->setDelayedCommit();
    }
    microOps[0]->setFirstMicroop();
    microOps[numMicroops - 1]->setLastMicroop();
}
 
VstSingleOp::VstSingleOp(const char *mnem, ExtMachInst machInst,
                         OpClass __opClass, bool all, unsigned elems,
                         RegIndex rn, RegIndex vd, unsigned regs,
                         unsigned inc, uint32_t size, uint32_t align,
                         RegIndex rm, unsigned lane) :
    PredMacroOp(mnem, machInst, __opClass)
{
    assert(!all);
    assert(regs > 0 && regs <= 4);
    assert(regs % elems == 0);
 
    unsigned eBytes = (1 << size);
    unsigned storeSize = eBytes * elems;
    [[maybe_unused]] unsigned storeRegs =
        (storeSize + sizeof(uint32_t) - 1) / sizeof(uint32_t);
 
    assert(storeRegs > 0 && storeRegs <= 4);
 
    numMicroops = 1;
    bool wb = (rm != 15);
 
    if (wb) numMicroops++;
    numMicroops += (regs / elems);
    microOps = new StaticInstPtr[numMicroops];
 
    RegIndex ufp0 = VecSpecialElem;
 
    unsigned uopIdx = 0;
    switch (elems) {
      case 4:
        assert(regs == 4);
        switch (size) {
          case 0:
            microOps[uopIdx++] = new MicroPackNeon8to2Uop<uint8_t>(
                    machInst, ufp0, vd * 2, inc * 2, lane);
            break;
          case 1:
            microOps[uopIdx++] = new MicroPackNeon8to2Uop<uint16_t>(
                    machInst, ufp0, vd * 2, inc * 2, lane);
            break;
          case 2:
            microOps[uopIdx++] = new MicroPackNeon8to4Uop<uint32_t>(
                    machInst, ufp0, vd * 2, inc * 2, lane);
            break;
          default:
            // Bad size
            microOps[uopIdx++] = new Unknown(machInst);
            break;
        }
        break;
      case 3:
        assert(regs == 3);
        switch (size) {
          case 0:
            microOps[uopIdx++] = new MicroPackNeon6to2Uop<uint8_t>(
                    machInst, ufp0, vd * 2, inc * 2, lane);
            break;
          case 1:
            microOps[uopIdx++] = new MicroPackNeon6to2Uop<uint16_t>(
                    machInst, ufp0, vd * 2, inc * 2, lane);
            break;
          case 2:
            microOps[uopIdx++] = new MicroPackNeon6to4Uop<uint32_t>(
                    machInst, ufp0, vd * 2, inc * 2, lane);
            break;
          default:
            // Bad size
            microOps[uopIdx++] = new Unknown(machInst);
            break;
        }
        break;
      case 2:
        assert(regs == 2);
        assert(storeRegs <= 2);
        switch (size) {
          case 0:
            microOps[uopIdx++] = new MicroPackNeon4to2Uop<uint8_t>(
                    machInst, ufp0, vd * 2, inc * 2, lane);
            break;
          case 1:
            microOps[uopIdx++] = new MicroPackNeon4to2Uop<uint16_t>(
                    machInst, ufp0, vd * 2, inc * 2, lane);
            break;
          case 2:
            microOps[uopIdx++] = new MicroPackNeon4to2Uop<uint32_t>(
                    machInst, ufp0, vd * 2, inc * 2, lane);
            break;
          default:
            // Bad size
            microOps[uopIdx++] = new Unknown(machInst);
            break;
        }
        break;
      case 1:
        assert(regs == 1 || (all && regs == 2));
        assert(storeRegs <= 2);
        for (unsigned offset = 0; offset < regs; offset++) {
            switch (size) {
              case 0:
                microOps[uopIdx++] = new MicroPackNeon2to2Uop<uint8_t>(
                        machInst, ufp0, (vd + offset) * 2, inc * 2, lane);
                break;
              case 1:
                microOps[uopIdx++] = new MicroPackNeon2to2Uop<uint16_t>(
                        machInst, ufp0, (vd + offset) * 2, inc * 2, lane);
                break;
              case 2:
                microOps[uopIdx++] = new MicroPackNeon2to2Uop<uint32_t>(
                        machInst, ufp0, (vd + offset) * 2, inc * 2, lane);
                break;
              default:
                // Bad size
                microOps[uopIdx++] = new Unknown(machInst);
                break;
            }
        }
        break;
      default:
        // Bad number of elements to unpack
        microOps[uopIdx++] = new Unknown(machInst);
    }
    switch (storeSize) {
      case 1:
        microOps[uopIdx++] = new MicroStrNeon1Uop<uint8_t>(
                machInst, ufp0, rn, 0, align);
        break;
      case 2:
        if (eBytes == 2) {
            microOps[uopIdx++] = new MicroStrNeon2Uop<uint16_t>(
                    machInst, ufp0, rn, 0, align);
        } else {
            microOps[uopIdx++] = new MicroStrNeon2Uop<uint8_t>(
                    machInst, ufp0, rn, 0, align);
        }
        break;
      case 3:
        microOps[uopIdx++] = new MicroStrNeon3Uop<uint8_t>(
                machInst, ufp0, rn, 0, align);
        break;
      case 4:
        switch (eBytes) {
          case 1:
            microOps[uopIdx++] = new MicroStrNeon4Uop<uint8_t>(
                    machInst, ufp0, rn, 0, align);
            break;
          case 2:
            microOps[uopIdx++] = new MicroStrNeon4Uop<uint16_t>(
                    machInst, ufp0, rn, 0, align);
            break;
          case 4:
            microOps[uopIdx++] = new MicroStrNeon4Uop<uint32_t>(
                    machInst, ufp0, rn, 0, align);
            break;
        }
        break;
      case 6:
        microOps[uopIdx++] = new MicroStrNeon6Uop<uint16_t>(
                machInst, ufp0, rn, 0, align);
        break;
      case 8:
        switch (eBytes) {
          case 2:
            microOps[uopIdx++] = new MicroStrNeon8Uop<uint16_t>(
                    machInst, ufp0, rn, 0, align);
            break;
          case 4:
            microOps[uopIdx++] = new MicroStrNeon8Uop<uint32_t>(
                    machInst, ufp0, rn, 0, align);
            break;
        }
        break;
      case 12:
        microOps[uopIdx++] = new MicroStrNeon12Uop<uint32_t>(
                machInst, ufp0, rn, 0, align);
        break;
      case 16:
        microOps[uopIdx++] = new MicroStrNeon16Uop<uint32_t>(
                machInst, ufp0, rn, 0, align);
        break;
      default:
        // Bad store size
        microOps[uopIdx++] = new Unknown(machInst);
    }
    if (wb) {
        if (rm != 15 && rm != 13) {
            microOps[uopIdx++] =
                new MicroAddUop(machInst, rn, rn, rm, 0, ArmISA::LSL);
        } else {
            microOps[uopIdx++] =
                new MicroAddiUop(machInst, rn, rn, storeSize);
        }
    }
    assert(uopIdx == numMicroops);
 
    for (unsigned i = 0; i < numMicroops - 1; i++) {
        MicroOp * uopPtr = dynamic_cast<MicroOp *>(microOps[i].get());
        assert(uopPtr);
        uopPtr->setDelayedCommit();
    }
    microOps[0]->setFirstMicroop();
    microOps[numMicroops - 1]->setLastMicroop();
}
 
VldMultOp64::VldMultOp64(const char *mnem, ExtMachInst machInst,
                         OpClass __opClass, RegIndex rn, RegIndex vd,
                         RegIndex rm, uint8_t eSize, uint8_t dataSize,
                         uint8_t numStructElems, uint8_t numRegs, bool wb) :
    PredMacroOp(mnem, machInst, __opClass)
{
    RegIndex vx = NumVecV8ArchRegs;
    RegIndex rnsp = (RegIndex) makeSP((IntRegIndex) rn);
    bool baseIsSP = isSP((IntRegIndex) rnsp);
 
    numMicroops = wb ? 1 : 0;
 
    int totNumBytes = numRegs * dataSize / 8;
    assert(totNumBytes <= 64);
 
    // The guiding principle here is that no more than 16 bytes can be
    // transferred at a time
    int numMemMicroops = totNumBytes / 16;
    int residuum = totNumBytes % 16;
    if (residuum)
        ++numMemMicroops;
    numMicroops += numMemMicroops;
 
    int numMarshalMicroops = numRegs / 2 + (numRegs % 2 ? 1 : 0);
    numMicroops += numMarshalMicroops;
 
    microOps = new StaticInstPtr[numMicroops];
    unsigned uopIdx = 0;
    uint32_t memaccessFlags = (MMU::ArmFlags)eSize | MMU::AllowUnaligned;
 
    int i = 0;
    for (; i < numMemMicroops - 1; ++i) {
        microOps[uopIdx++] = new MicroNeonLoad64(
            machInst, vx + (RegIndex) i, rnsp, 16 * i, memaccessFlags,
            baseIsSP, 16 /* accSize */, eSize);
    }
    microOps[uopIdx++] =  new MicroNeonLoad64(
        machInst, vx + (RegIndex) i, rnsp, 16 * i, memaccessFlags, baseIsSP,
        residuum ? residuum : 16 /* accSize */, eSize);
 
    // Writeback microop: the post-increment amount is encoded in "Rm": a
    // 64-bit general register OR as '11111' for an immediate value equal to
    // the total number of bytes transferred (i.e. 8, 16, 24, 32, 48 or 64)
    if (wb) {
        if (rm != ((RegIndex) INTREG_X31)) {
            microOps[uopIdx++] = new MicroAddXERegUop(machInst, rnsp, rnsp, rm,
                                                      UXTX, 0);
        } else {
            microOps[uopIdx++] = new MicroAddXiUop(machInst, rnsp, rnsp,
                                                   totNumBytes);
        }
    }
 
    for (int i = 0; i < numMarshalMicroops; ++i) {
        switch(numRegs) {
            case 1: microOps[uopIdx++] = new MicroDeintNeon64_1Reg(
                        machInst, vd + (RegIndex) (2 * i), vx, eSize, dataSize,
                        numStructElems, 1, i /* step */);
                    break;
            case 2: microOps[uopIdx++] = new MicroDeintNeon64_2Reg(
                        machInst, vd + (RegIndex) (2 * i), vx, eSize, dataSize,
                        numStructElems, 2, i /* step */);
                    break;
            case 3: microOps[uopIdx++] = new MicroDeintNeon64_3Reg(
                        machInst, vd + (RegIndex) (2 * i), vx, eSize, dataSize,
                        numStructElems, 3, i /* step */);
                    break;
            case 4: microOps[uopIdx++] = new MicroDeintNeon64_4Reg(
                        machInst, vd + (RegIndex) (2 * i), vx, eSize, dataSize,
                        numStructElems, 4, i /* step */);
                    break;
            default: panic("Invalid number of registers");
        }
 
    }
 
    assert(uopIdx == numMicroops);
 
    for (int i = 0; i < numMicroops - 1; ++i) {
        microOps[i]->setDelayedCommit();
    }
    microOps[0]->setFirstMicroop();
    microOps[numMicroops - 1]->setLastMicroop();
}
 
VstMultOp64::VstMultOp64(const char *mnem, ExtMachInst machInst,
                         OpClass __opClass, RegIndex rn, RegIndex vd,
                         RegIndex rm, uint8_t eSize, uint8_t dataSize,
                         uint8_t numStructElems, uint8_t numRegs, bool wb) :
    PredMacroOp(mnem, machInst, __opClass)
{
    RegIndex vx = NumVecV8ArchRegs;
    RegIndex rnsp = (RegIndex) makeSP((IntRegIndex) rn);
    bool baseIsSP = isSP((IntRegIndex) rnsp);
 
    numMicroops = wb ? 1 : 0;
 
    int totNumBytes = numRegs * dataSize / 8;
    assert(totNumBytes <= 64);
 
    // The guiding principle here is that no more than 16 bytes can be
    // transferred at a time
    int numMemMicroops = totNumBytes / 16;
    int residuum = totNumBytes % 16;
    if (residuum)
        ++numMemMicroops;
    numMicroops += numMemMicroops;
 
    int numMarshalMicroops = totNumBytes > 32 ? 2 : 1;
    numMicroops += numMarshalMicroops;
 
    microOps = new StaticInstPtr[numMicroops];
    unsigned uopIdx = 0;
 
    for (int i = 0; i < numMarshalMicroops; ++i) {
        switch (numRegs) {
            case 1: microOps[uopIdx++] = new MicroIntNeon64_1Reg(
                        machInst, vx + (RegIndex) (2 * i), vd, eSize, dataSize,
                        numStructElems, 1, i /* step */);
                    break;
            case 2: microOps[uopIdx++] = new MicroIntNeon64_2Reg(
                        machInst, vx + (RegIndex) (2 * i), vd, eSize, dataSize,
                        numStructElems, 2, i /* step */);
                    break;
            case 3: microOps[uopIdx++] = new MicroIntNeon64_3Reg(
                        machInst, vx + (RegIndex) (2 * i), vd, eSize, dataSize,
                        numStructElems, 3, i /* step */);
                    break;
            case 4: microOps[uopIdx++] = new MicroIntNeon64_4Reg(
                        machInst, vx + (RegIndex) (2 * i), vd, eSize, dataSize,
                        numStructElems, 4, i /* step */);
                    break;
            default: panic("Invalid number of registers");
        }
    }
 
    uint32_t memaccessFlags = (MMU::ArmFlags)eSize | MMU::AllowUnaligned;
 
    int i = 0;
    for (; i < numMemMicroops - 1; ++i) {
        microOps[uopIdx++] = new MicroNeonStore64(
            machInst, vx + (RegIndex) i, rnsp, 16 * i, memaccessFlags,
            baseIsSP, 16 /* accSize */, eSize);
    }
    microOps[uopIdx++] = new MicroNeonStore64(
        machInst, vx + (RegIndex) i, rnsp, 16 * i, memaccessFlags, baseIsSP,
        residuum ? residuum : 16 /* accSize */, eSize);
 
    // Writeback microop: the post-increment amount is encoded in "Rm": a
    // 64-bit general register OR as '11111' for an immediate value equal to
    // the total number of bytes transferred (i.e. 8, 16, 24, 32, 48 or 64)
    if (wb) {
        if (rm != ((RegIndex) INTREG_X31)) {
            microOps[uopIdx++] = new MicroAddXERegUop(machInst, rnsp, rnsp, rm,
                                                      UXTX, 0);
        } else {
            microOps[uopIdx++] = new MicroAddXiUop(machInst, rnsp, rnsp,
                                                   totNumBytes);
        }
    }
 
    assert(uopIdx == numMicroops);
 
    for (int i = 0; i < numMicroops - 1; i++) {
        microOps[i]->setDelayedCommit();
    }
    microOps[0]->setFirstMicroop();
    microOps[numMicroops - 1]->setLastMicroop();
}
 
VldSingleOp64::VldSingleOp64(const char *mnem, ExtMachInst machInst,
                             OpClass __opClass, RegIndex rn, RegIndex vd,
                             RegIndex rm, uint8_t eSize, uint8_t dataSize,
                             uint8_t numStructElems, uint8_t index, bool wb,
                             bool replicate) :
    PredMacroOp(mnem, machInst, __opClass),
    eSize(0), dataSize(0), numStructElems(0), index(0),
    wb(false), replicate(false)
 
{
    RegIndex vx = NumVecV8ArchRegs;
    RegIndex rnsp = (RegIndex) makeSP((IntRegIndex) rn);
    bool baseIsSP = isSP((IntRegIndex) rnsp);
 
    numMicroops = wb ? 1 : 0;
 
    int eSizeBytes = 1 << eSize;
    int totNumBytes = numStructElems * eSizeBytes;
    assert(totNumBytes <= 64);
 
    // The guiding principle here is that no more than 16 bytes can be
    // transferred at a time
    int numMemMicroops = totNumBytes / 16;
    int residuum = totNumBytes % 16;
    if (residuum)
        ++numMemMicroops;
    numMicroops += numMemMicroops;
 
    int numMarshalMicroops = numStructElems / 2 + (numStructElems % 2 ? 1 : 0);
    numMicroops += numMarshalMicroops;
 
    microOps = new StaticInstPtr[numMicroops];
    unsigned uopIdx = 0;
 
    uint32_t memaccessFlags = (MMU::ArmFlags)eSize | MMU::AllowUnaligned;
 
    int i = 0;
    for (; i < numMemMicroops - 1; ++i) {
        microOps[uopIdx++] = new MicroNeonLoad64(
            machInst, vx + (RegIndex) i, rnsp, 16 * i, memaccessFlags,
            baseIsSP, 16 /* accSize */, eSize);
    }
    microOps[uopIdx++] = new MicroNeonLoad64(
        machInst, vx + (RegIndex) i, rnsp, 16 * i, memaccessFlags, baseIsSP,
        residuum ? residuum : 16 /* accSize */, eSize);
 
    // Writeback microop: the post-increment amount is encoded in "Rm": a
    // 64-bit general register OR as '11111' for an immediate value equal to
    // the total number of bytes transferred (i.e. 8, 16, 24, 32, 48 or 64)
    if (wb) {
        if (rm != ((RegIndex) INTREG_X31)) {
            microOps[uopIdx++] = new MicroAddXERegUop(machInst, rnsp, rnsp, rm,
                                                      UXTX, 0);
        } else {
            microOps[uopIdx++] = new MicroAddXiUop(machInst, rnsp, rnsp,
                                                   totNumBytes);
        }
    }
 
    for (int i = 0; i < numMarshalMicroops; ++i) {
        microOps[uopIdx++] = new MicroUnpackNeon64(
            machInst, vd + (RegIndex) (2 * i), vx, eSize, dataSize,
            numStructElems, index, i /* step */, replicate);
    }
 
    assert(uopIdx == numMicroops);
 
    for (int i = 0; i < numMicroops - 1; i++) {
        microOps[i]->setDelayedCommit();
    }
    microOps[0]->setFirstMicroop();
    microOps[numMicroops - 1]->setLastMicroop();
}
 
VstSingleOp64::VstSingleOp64(const char *mnem, ExtMachInst machInst,
                             OpClass __opClass, RegIndex rn, RegIndex vd,
                             RegIndex rm, uint8_t eSize, uint8_t dataSize,
                             uint8_t numStructElems, uint8_t index, bool wb,
                             bool replicate) :
    PredMacroOp(mnem, machInst, __opClass),
    eSize(0), dataSize(0), numStructElems(0), index(0),
    wb(false), replicate(false)
{
    RegIndex vx = NumVecV8ArchRegs;
    RegIndex rnsp = (RegIndex) makeSP((IntRegIndex) rn);
    bool baseIsSP = isSP((IntRegIndex) rnsp);
 
    numMicroops = wb ? 1 : 0;
 
    int eSizeBytes = 1 << eSize;
    int totNumBytes = numStructElems * eSizeBytes;
    assert(totNumBytes <= 64);
 
    // The guiding principle here is that no more than 16 bytes can be
    // transferred at a time
    int numMemMicroops = totNumBytes / 16;
    int residuum = totNumBytes % 16;
    if (residuum)
        ++numMemMicroops;
    numMicroops += numMemMicroops;
 
    int numMarshalMicroops = totNumBytes > 32 ? 2 : 1;
    numMicroops += numMarshalMicroops;
 
    microOps = new StaticInstPtr[numMicroops];
    unsigned uopIdx = 0;
 
    for (int i = 0; i < numMarshalMicroops; ++i) {
        microOps[uopIdx++] = new MicroPackNeon64(
            machInst, vx + (RegIndex) (2 * i), vd, eSize, dataSize,
            numStructElems, index, i /* step */, replicate);
    }
 
    uint32_t memaccessFlags = (MMU::ArmFlags)eSize | MMU::AllowUnaligned;
 
    int i = 0;
    for (; i < numMemMicroops - 1; ++i) {
        microOps[uopIdx++] = new MicroNeonStore64(
            machInst, vx + (RegIndex) i, rnsp, 16 * i, memaccessFlags,
            baseIsSP, 16 /* accsize */, eSize);
    }
    microOps[uopIdx++] = new MicroNeonStore64(
        machInst, vx + (RegIndex) i, rnsp, 16 * i, memaccessFlags, baseIsSP,
        residuum ? residuum : 16 /* accSize */, eSize);
 
    // Writeback microop: the post-increment amount is encoded in "Rm": a
    // 64-bit general register OR as '11111' for an immediate value equal to
    // the total number of bytes transferred (i.e. 8, 16, 24, 32, 48 or 64)
    if (wb) {
        if (rm != ((RegIndex) INTREG_X31)) {
            microOps[uopIdx++] = new MicroAddXERegUop(machInst, rnsp, rnsp, rm,
                                                      UXTX, 0);
        } else {
            microOps[uopIdx++] = new MicroAddXiUop(machInst, rnsp, rnsp,
                                                   totNumBytes);
        }
    }
 
    assert(uopIdx == numMicroops);
 
    for (int i = 0; i < numMicroops - 1; i++) {
        microOps[i]->setDelayedCommit();
    }
    microOps[0]->setFirstMicroop();
    microOps[numMicroops - 1]->setLastMicroop();
}
 
MacroVFPMemOp::MacroVFPMemOp(const char *mnem, ExtMachInst machInst,
                             OpClass __opClass, IntRegIndex rn,
                             RegIndex vd, bool single, bool up,
                             bool writeback, bool load, uint32_t offset) :
    PredMacroOp(mnem, machInst, __opClass)
{
    int i = 0;
 
    // The lowest order bit selects fldmx (set) or fldmd (clear). These seem
    // to be functionally identical except that fldmx is deprecated. For now
    // we'll assume they're otherwise interchangable.
    int count = (single ? offset : (offset / 2));
    numMicroops = count * (single ? 1 : 2) + (writeback ? 1 : 0);
    microOps = new StaticInstPtr[numMicroops];
 
    int64_t addr = 0;
 
    if (!up)
        addr = 4 * offset;
 
    bool tempUp = up;
    for (int j = 0; j < count; j++) {
        if (load) {
            if (single) {
                microOps[i++] = new MicroLdrFpUop(machInst, vd++, rn,
                                                  tempUp, addr);
            } else {
                microOps[i++] = new MicroLdrDBFpUop(machInst, vd++, rn,
                                                    tempUp, addr);
                microOps[i++] = new MicroLdrDTFpUop(machInst, vd++, rn, tempUp,
                                                    addr + (up ? 4 : -4));
            }
        } else {
            if (single) {
                microOps[i++] = new MicroStrFpUop(machInst, vd++, rn,
                                                  tempUp, addr);
            } else {
                microOps[i++] = new MicroStrDBFpUop(machInst, vd++, rn,
                                                    tempUp, addr);
                microOps[i++] = new MicroStrDTFpUop(machInst, vd++, rn, tempUp,
                                                    addr + (up ? 4 : -4));
            }
        }
        if (!tempUp) {
            addr -= (single ? 4 : 8);
            // The microops don't handle negative displacement, so turn if we
            // hit zero, flip polarity and start adding.
            if (addr <= 0) {
                tempUp = true;
                addr = -addr;
            }
        } else {
            addr += (single ? 4 : 8);
        }
    }
 
    if (writeback) {
        if (up) {
            microOps[i++] =
                new MicroAddiUop(machInst, rn, rn, 4 * offset);
        } else {
            microOps[i++] =
                new MicroSubiUop(machInst, rn, rn, 4 * offset);
        }
    }
 
    assert(numMicroops == i);
    microOps[0]->setFirstMicroop();
    microOps[numMicroops - 1]->setLastMicroop();
 
    for (StaticInstPtr *curUop = microOps;
            !(*curUop)->isLastMicroop(); curUop++) {
        MicroOp * uopPtr = dynamic_cast<MicroOp *>(curUop->get());
        assert(uopPtr);
        uopPtr->setDelayedCommit();
    }
}
 
std::string
MicroIntImmOp::generateDisassembly(
        Addr pc, const loader::SymbolTable *symtab) const
{
    std::stringstream ss;
    printMnemonic(ss);
    printIntReg(ss, ura);
    ss << ", ";
    printIntReg(ss, urb);
    ss << ", ";
    ccprintf(ss, "#%d", imm);
    return ss.str();
}
 
std::string
MicroIntImmXOp::generateDisassembly(
        Addr pc, const loader::SymbolTable *symtab) const
{
    std::stringstream ss;
    printMnemonic(ss);
    printIntReg(ss, ura);
    ss << ", ";
    printIntReg(ss, urb);
    ss << ", ";
    ccprintf(ss, "#%d", imm);
    return ss.str();
}
 
std::string
MicroSetPCCPSR::generateDisassembly(
        Addr pc, const loader::SymbolTable *symtab) const
{
    std::stringstream ss;
    printMnemonic(ss);
    ss << "[PC,CPSR]";
    return ss.str();
}
 
std::string
MicroIntRegXOp::generateDisassembly(
        Addr pc, const loader::SymbolTable *symtab) const
{
    std::stringstream ss;
    printMnemonic(ss);
    printIntReg(ss, ura);
    ccprintf(ss, ", ");
    printIntReg(ss, urb);
    printExtendOperand(false, ss, (IntRegIndex)urc, type, shiftAmt);
    return ss.str();
}
 
std::string
MicroIntMov::generateDisassembly(
        Addr pc, const loader::SymbolTable *symtab) const
{
    std::stringstream ss;
    printMnemonic(ss);
    printIntReg(ss, ura);
    ss << ", ";
    printIntReg(ss, urb);
    return ss.str();
}
 
std::string
MicroIntOp::generateDisassembly(
        Addr pc, const loader::SymbolTable *symtab) const
{
    std::stringstream ss;
    printMnemonic(ss);
    printIntReg(ss, ura);
    ss << ", ";
    printIntReg(ss, urb);
    ss << ", ";
    printIntReg(ss, urc);
    return ss.str();
}
 
std::string
MicroMemOp::generateDisassembly(
        Addr pc, const loader::SymbolTable *symtab) const
{
    std::stringstream ss;
    printMnemonic(ss);
    if (isFloating())
        printFloatReg(ss, ura);
    else
        printIntReg(ss, ura);
    ss << ", [";
    printIntReg(ss, urb);
    ss << ", ";
    ccprintf(ss, "#%d", imm);
    ss << "]";
    return ss.str();
}
 
std::string
MicroMemPairOp::generateDisassembly(
        Addr pc, const loader::SymbolTable *symtab) const
{
    std::stringstream ss;
    printMnemonic(ss);
    printIntReg(ss, dest);
    ss << ",";
    printIntReg(ss, dest2);
    ss << ", [";
    printIntReg(ss, urb);
    ss << ", ";
    ccprintf(ss, "#%d", imm);
    ss << "]";
    return ss.str();
}
 
} // namespace ArmISA
} // namespace gem5