C# or C++ for Emulator?

["Bryan Parkoff" <nospam@nospam.com>]

    I can't tell which C# or C++ is better programming language.  C# is 
better than C++ for readable code, but C++ is better than C# for tuning 
optimization.  I would be surprised that C# has high performance when C++'s 
optimization was tuned.  Have you tried written either C# and C++ in Apple 
II Emulator project?  Did you test them?  Did the results show the 
difference of performance?
    I prefer fast code without error trapping.  The error trapping is an 
example below.

Example 1:
    unsigned short PC = 0;
    unsigned char Byte = Mem[PC];
    PC++;

    It is C++ source code.  It has fast code without error trapping.  PC has 
16 bits and Byte has 8 bits.

Example 2:
    unsigned long PC = 0;
    unsigned long Byte = Mem[PC];
    PC++;
    PC &= 0xFFFF; // or if (PC == 0x10000) PC = 0;

    It is again C++ source code.  It has less fast code within error 
trapping.  Both PC and Byte are 32 bits or 64 bits.  You need error trapping 
to clear all bits except 15th through 0th bit on PC using mask or if then. 
All registers with 32 bits or 64 bits are better for performance, but they 
have to live with error trapping.  If error trapping is not used, Byte will 
read and load data from garbage memory before crash or illegal message may 
occur.
    It sounds like C# uses C++ Example 2.  Do you agree?  I wonder that C# 
is not portable to other machines?

    The dynamic recompilation is not a good practice, but opcode interpreter 
is better practice for emulator.  Opcode interpreter is little slower than 
dynamic recompilation.  If you choose dynamic recompilation, ROM image and 
DSK image must be converted from 6502 code machine into 80x86 code machine 
once before ROM image and DSK image with 80x86 code machine can be run.  The 
problem is that you write Applesoft BASIC language or 6502 assembly language 
while they are already native 80x86 code machine in RAM.  It can give wrong 
size length when they needed to be converted from 80x86 code machine back to 
6502 code machine before they can be written back to ROM image or DSK image.
    Please comment what you think.

Bryan Parkoff