as: PowerPC-Chars
9.35.3.1 Special Characters
...........................
The presence of a '#' on a line indicates the start of a comment that
extends to the end of the current line.
If a '#' appears as the first character of a line then the whole line
is treated as a comment, but in this case the line could also be a
logical line number directive (Comments) or a preprocessor
control command (Preprocessing).
If the assembler has been configured for the ppc-*-solaris* target
then the '!' character also acts as a line comment character. This can
be disabled via the '-mno-solaris' command-line option.
The ';' character can be used to separate statements on the same
line.