Bitwise operators

[kerrywolfe]

Hey everybody,

I have some quick and easy questions for you. Need to create some C++ statements to resemble assembler language (H6809).

Need:

1. ANDA# - computes the bitwise and of memory[pc] and A....

2. BEQ - stores the byte held in Memory[PC] (signextended) in EAR.


ANy help much appreciated!!

[Sorensen]

1. You can use the & operator -

var &= A;

with store the bitwise AND of var and A in var (whatever A represents).

2. There's no way of working directly with registers in C++ (I'm assuming EAR is a register). However you can use the register keyword as a hint to the compiler to store a variable in a register (which it often ignores). Something like -

register byte_t = var;

where var symbolises the location in memory, and byte_t is a typedef of char.

[samGwilliam]

You could do what he said or you could use:

asm
{
   mov ax, a
   mov bx, b
   or ax, bx
   mov a, ax
}

This would leave the result in a. I think. My asm is a little rusty.