clears any previously selected architecture extensions.
may be used multiple times to add or remove extensions incrementally to the architecture being compiled for.
.dworddirective produces 64 bit values.
.evendirective aligns the output on the next even byte boundary.
.ltorgdirective will only affect the literal pool of the current section and sub-section. At the end of assembly all remaining, un-empty literal pools will automatically be dumped.
Note - older versions of GAS would dump the current literal pool any time a section change occurred. This is no longer done, since it prevents accurate control of the placement of literal pools.
foo .req w0
reqdirective. For example:
foo .req w0 .unreq foo
An error occurs if the name is undefined. Note - this pseudo op can be used to delete builtin in register name aliases (eg 'w0'). This should only be done if it is really necessary.
.xworddirective produces 64 bit values. This is the same as the