Method dynamic_cmpxchg_lock

source/emulation/cpu/armv8/jitArmV8CodeGen.cpp:5670–5748

}

void JitArmV8CodeGen::dynamic_cmpxchg_lock(JitWidth width, DecodedOp* op) {
    JitCodeGen::write(JitWidth::b16, calculateEaa(op), nullptr, [width, op, this](MemPtr mem) {
        LazyFlagType flagType;
        
        if (width == JitWidth::b32) {
            flagType = FLAGS_CMP32;
        } else if (width == JitWidth::b16) {
            flagType = FLAGS_CMP16;
        } else if (width == JitWidth::b8) {
            flagType = FLAGS_CMP8;
        } else {
            kpanic("JitArmV8CodeGen::dynamic_cmpxchg_lock");
            flagType = FLAGS_NONE;
        }
                
        RegPtr tmp = getTmpReg();
        RegPtr tmp2 = getTmpReg();
        RegPtr reg = getReadOnlyRegInLower(width, op->reg);
        RegPtr eax = getReg(0);


        RegPtr address = calculateAddress(mem);

        RegPtr tmpEax = eax;
        bool needToCopyEaxBack = false;        
        JitFlags jitFlags(this, cpu, op, flagType, eax, nullptr, false);
        jitFlags.copyDest(eax);

        if (width != JitWidth::b32 || (jitFlags.flags && (jitFlags.flags->usesSrc(jitFlags.needsToSetFlags) || jitFlags.flags->usesResult(jitFlags.needsToSetFlags)))) {
            tmpEax = getTmpReg();
            movzx(JitWidth::b32, tmpEax, width, eax);
            needToCopyEaxBack = true;
        }

        if (rt.cpu_features().has(asmjit::CpuFeatures::ARM::kLSE)) {
            if (width == JitWidth::b32) {
                compiler.casal(R32(tmpEax), R32(reg), Mem(R64(address)));
            } else if (width == JitWidth::b16) {
                compiler.casalh(R32(tmpEax), R32(reg), Mem(R64(address)));
            } else if (width == JitWidth::b8) {
                compiler.casalb(R32(tmpEax), R32(reg), Mem(R64(address)));
            }
            if (jitFlags.flags && jitFlags.flags->usesResult(jitFlags.needsToSetFlags)) {
                compiler.sub(R32(tmp2), wEAX, R32(tmpEax));
            }
            if (needToCopyEaxBack) {
                mov(width, eax, tmpEax);
            }            
        } else {
            Label label = compiler.new_label();
            compiler.bind(label);
            if (width == JitWidth::b32) {
                compiler.ldaxr(R32(tmp), Mem(R64(address)));
            } else if (width == JitWidth::b16) {
                compiler.ldaxrh(R32(tmp), Mem(R64(address)));
            } else if (width == JitWidth::b8) {
                compiler.ldaxrb(R32(tmp), Mem(R64(address)));
            }