18.104.22.168 Special Characters
- A register name can optionally be prefixed by a `%' character. So
%r0 is equivalent to
r0 in the assembly code.
- The presence of a `#' character within a line (but not at the
start of a line) indicates the start of a comment that extends to the
end of the current line.
Note: if a line starts with a `#' character then it can
also be a logical line number directive (see Comments) or a
preprocessor control command (see Preprocessing).
- Prefixing an operand with an `@' specifies that the operand is a
symbol and not a register. This is how the assembler disambiguates
the use of an ARC register name as a symbol. So the instruction
mov r0, @r0
moves the address of symbol
r0 into register
- The ``' (backtick) character is used to separate statements on a
- Used as a separator to obtain a sequence of commands from a C